From 8eeb1e83eb54084349e91b181d22bf829577e5be Mon Sep 17 00:00:00 2001
From: Jonathan Hui <jonhui@google.com>
Date: Thu, 19 Mar 2020 14:31:02 -0700
Subject: [PATCH] [cli] change aArgsLength type from int to uint8_t (#4718)

---
 examples/platforms/jn5189/diag.c       |   2 +-
 examples/platforms/nrf528xx/src/diag.c |  32 +++--
 include/openthread/cli.h               |   4 +-
 include/openthread/diag.h              |   6 +-
 include/openthread/platform/diag.h     |   6 +-
 src/cli/cli.cpp                        | 178 ++++++++++++-------------
 src/cli/cli.hpp                        | 172 ++++++++++++------------
 src/cli/cli_coap.cpp                   |  18 +--
 src/cli/cli_coap.hpp                   |  20 +--
 src/cli/cli_coap_secure.cpp            |  20 +--
 src/cli/cli_coap_secure.hpp            |  22 +--
 src/cli/cli_commissioner.cpp           |  24 ++--
 src/cli/cli_commissioner.hpp           |  26 ++--
 src/cli/cli_dataset.cpp                |  42 +++---
 src/cli/cli_dataset.hpp                |  44 +++---
 src/cli/cli_joiner.cpp                 |  10 +-
 src/cli/cli_joiner.hpp                 |  12 +-
 src/cli/cli_udp.cpp                    |  18 +--
 src/cli/cli_udp.hpp                    |  16 +--
 src/core/api/diags_api.cpp             |   2 +-
 src/core/diags/factory_diags.cpp       |  32 +++--
 src/core/diags/factory_diags.hpp       |  20 +--
 src/posix/platform/radio_spinel.cpp    |   9 +-
 tests/fuzz/fuzzer_platform.cpp         |   8 +-
 tests/unit/test_platform.cpp           |   2 +-
 25 files changed, 391 insertions(+), 354 deletions(-)

diff --git a/examples/platforms/jn5189/diag.c b/examples/platforms/jn5189/diag.c
index 6b01e3071..bc11f24c7 100755
--- a/examples/platforms/jn5189/diag.c
+++ b/examples/platforms/jn5189/diag.c
@@ -45,7 +45,7 @@
  */
 static bool sDiagMode = false;
 
-void otPlatDiagProcess(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+void otPlatDiagProcess(otInstance *aInstance, uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aInstance);
     OT_UNUSED_VARIABLE(aArgsLength);
diff --git a/examples/platforms/nrf528xx/src/diag.c b/examples/platforms/nrf528xx/src/diag.c
index 2e399295a..32c78cbd9 100644
--- a/examples/platforms/nrf528xx/src/diag.c
+++ b/examples/platforms/nrf528xx/src/diag.c
@@ -59,7 +59,7 @@ typedef enum
 struct PlatformDiagCommand
 {
     const char *mName;
-    otError (*mCommand)(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError (*mCommand)(otInstance *aInstance, uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
 };
 
 struct PlatformDiagMessage
@@ -111,7 +111,11 @@ static bool startCarrierTransmision(void)
     return nrf_802154_continuous_carrier();
 }
 
-static otError processListen(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+static otError processListen(otInstance *aInstance,
+                             uint8_t     aArgsLength,
+                             char *      aArgs[],
+                             char *      aOutput,
+                             size_t      aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aInstance);
 
@@ -139,7 +143,7 @@ exit:
     return error;
 }
 
-static otError processID(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+static otError processID(otInstance *aInstance, uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aInstance);
 
@@ -168,7 +172,7 @@ exit:
 }
 
 static otError processTransmit(otInstance *aInstance,
-                               int         aArgsLength,
+                               uint8_t     aArgsLength,
                                char *      aArgs[],
                                char *      aOutput,
                                size_t      aOutputMaxLen)
@@ -252,7 +256,11 @@ exit:
     return error;
 }
 
-static otError processGpio(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+static otError processGpio(otInstance *aInstance,
+                           uint8_t     aArgsLength,
+                           char *      aArgs[],
+                           char *      aOutput,
+                           size_t      aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aInstance);
 
@@ -332,7 +340,11 @@ exit:
     return error;
 }
 
-static otError processTemp(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+static otError processTemp(otInstance *aInstance,
+                           uint8_t     aArgsLength,
+                           char *      aArgs[],
+                           char *      aOutput,
+                           size_t      aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aInstance);
     OT_UNUSED_VARIABLE(aArgs);
@@ -355,7 +367,7 @@ exit:
 }
 
 static otError processCcaThreshold(otInstance *aInstance,
-                                   int         aArgsLength,
+                                   uint8_t     aArgsLength,
                                    char *      aArgs[],
                                    char *      aOutput,
                                    size_t      aOutputMaxLen)
@@ -402,7 +414,11 @@ const struct PlatformDiagCommand sCommands[] = {
     {"transmit", &processTransmit},
 };
 
-otError otPlatDiagProcess(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError otPlatDiagProcess(otInstance *aInstance,
+                          uint8_t     aArgsLength,
+                          char *      aArgs[],
+                          char *      aOutput,
+                          size_t      aOutputMaxLen)
 {
     otError error = OT_ERROR_INVALID_COMMAND;
     size_t  i;
diff --git a/include/openthread/cli.h b/include/openthread/cli.h
index 2eba04383..1683c238a 100644
--- a/include/openthread/cli.h
+++ b/include/openthread/cli.h
@@ -51,8 +51,8 @@ extern "C" {
  */
 typedef struct otCliCommand
 {
-    const char *mName;                                ///< A pointer to the command string.
-    void (*mCommand)(int aArgsLength, char *aArgs[]); ///< A function pointer to process the command.
+    const char *mName;                                    ///< A pointer to the command string.
+    void (*mCommand)(uint8_t aArgsLength, char *aArgs[]); ///< A function pointer to process the command.
 } otCliCommand;
 
 /**
diff --git a/include/openthread/diag.h b/include/openthread/diag.h
index d8ada6e42..869400a23 100644
--- a/include/openthread/diag.h
+++ b/include/openthread/diag.h
@@ -65,7 +65,11 @@ extern "C" {
  * @retval  OT_ERROR_NOT_IMPLEMENTED    The command is not supported.
  *
  */
-otError otDiagProcessCmd(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+otError otDiagProcessCmd(otInstance *aInstance,
+                         uint8_t     aArgsLength,
+                         char *      aArgs[],
+                         char *      aOutput,
+                         size_t      aOutputMaxLen);
 
 /**
  * This function processes a factory diagnostics command line.
diff --git a/include/openthread/platform/diag.h b/include/openthread/platform/diag.h
index 3eba39b3e..d8dcc9d77 100644
--- a/include/openthread/platform/diag.h
+++ b/include/openthread/platform/diag.h
@@ -70,7 +70,11 @@ extern "C" {
  * @retval  OT_ERROR_INVALID_COMMAND    The command is not valid or not supported.
  *
  */
-otError otPlatDiagProcess(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+otError otPlatDiagProcess(otInstance *aInstance,
+                          uint8_t     aArgsLength,
+                          char *      aArgs[],
+                          char *      aOutput,
+                          size_t      aOutputMaxLen);
 
 /**
  * This function enables/disables the factory diagnostics mode.
diff --git a/src/cli/cli.cpp b/src/cli/cli.cpp
index c49ff5f92..3a33b15c0 100644
--- a/src/cli/cli.cpp
+++ b/src/cli/cli.cpp
@@ -417,7 +417,7 @@ exit:
     return error;
 }
 
-void Interpreter::ProcessHelp(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessHelp(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -427,7 +427,7 @@ void Interpreter::ProcessHelp(int aArgsLength, char *aArgs[])
         mServer->OutputFormat("%s\r\n", sCommands[i].mName);
     }
 
-    for (unsigned int i = 0; i < mUserCommandsLength; i++)
+    for (uint8_t i = 0; i < mUserCommandsLength; i++)
     {
         mServer->OutputFormat("%s\r\n", mUserCommands[i].mName);
     }
@@ -435,7 +435,7 @@ void Interpreter::ProcessHelp(int aArgsLength, char *aArgs[])
     AppendResult(OT_ERROR_NONE);
 }
 
-void Interpreter::ProcessBufferInfo(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessBufferInfo(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -460,7 +460,7 @@ void Interpreter::ProcessBufferInfo(int aArgsLength, char *aArgs[])
     AppendResult(OT_ERROR_NONE);
 }
 
-void Interpreter::ProcessChannel(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessChannel(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -606,7 +606,7 @@ exit:
 }
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessChild(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessChild(uint8_t aArgsLength, char *aArgs[])
 {
     otError     error = OT_ERROR_NONE;
     otChildInfo childInfo;
@@ -716,7 +716,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessChildIp(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessChildIp(uint8_t aArgsLength, char *aArgs[])
 {
     otError  error = OT_ERROR_NONE;
     uint16_t maxChildren;
@@ -752,7 +752,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessChildMax(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessChildMax(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -772,7 +772,7 @@ exit:
 }
 #endif // OPENTHREAD_FTD
 
-void Interpreter::ProcessChildTimeout(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessChildTimeout(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -793,7 +793,7 @@ exit:
 
 #if OPENTHREAD_CONFIG_COAP_API_ENABLE
 
-void Interpreter::ProcessCoap(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessCoap(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     error = mCoap.Process(aArgsLength, aArgs);
@@ -804,7 +804,7 @@ void Interpreter::ProcessCoap(int aArgsLength, char *aArgs[])
 
 #if OPENTHREAD_CONFIG_COAP_SECURE_API_ENABLE
 
-void Interpreter::ProcessCoapSecure(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessCoapSecure(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     error = mCoapSecure.Process(aArgsLength, aArgs);
@@ -814,7 +814,7 @@ void Interpreter::ProcessCoapSecure(int aArgsLength, char *aArgs[])
 #endif // OPENTHREAD_CONFIG_COAP_SECURE_API_ENABLE
 
 #if OPENTHREAD_CONFIG_PLATFORM_RADIO_COEX_ENABLE
-void Interpreter::ProcessCoexMetrics(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessCoexMetrics(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -871,7 +871,7 @@ exit:
 #endif // OPENTHREAD_CONFIG_PLATFORM_RADIO_COEX_ENABLE
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessContextIdReuseDelay(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessContextIdReuseDelay(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -891,7 +891,7 @@ exit:
 }
 #endif // OPENTHREAD_FTD
 
-void Interpreter::ProcessCounters(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessCounters(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -983,7 +983,7 @@ exit:
 }
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessDelayTimerMin(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessDelayTimerMin(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1007,7 +1007,7 @@ exit:
 }
 #endif
 
-void Interpreter::ProcessDiscover(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessDiscover(uint8_t aArgsLength, char *aArgs[])
 {
     otError  error        = OT_ERROR_NONE;
     uint32_t scanChannels = 0;
@@ -1034,7 +1034,7 @@ exit:
 }
 
 #if OPENTHREAD_CONFIG_DNS_CLIENT_ENABLE
-void Interpreter::ProcessDns(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessDns(uint8_t aArgsLength, char *aArgs[])
 {
     otError          error = OT_ERROR_NONE;
     long             port  = OT_DNS_DEFAULT_SERVER_PORT;
@@ -1118,7 +1118,7 @@ void Interpreter::HandleDnsResponse(const char *aHostname, const Ip6::Address *a
 #endif
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessEidCache(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessEidCache(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -1143,7 +1143,7 @@ exit:
 }
 #endif // OPENTHREAD_FTD
 
-void Interpreter::ProcessEui64(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessEui64(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgs);
 
@@ -1160,7 +1160,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessExtAddress(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessExtAddress(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1184,7 +1184,7 @@ exit:
 }
 
 #if OPENTHREAD_POSIX
-void Interpreter::ProcessExit(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessExit(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -1195,7 +1195,7 @@ void Interpreter::ProcessExit(int aArgsLength, char *aArgs[])
 
 #if (OPENTHREAD_CONFIG_LOG_OUTPUT == OPENTHREAD_CONFIG_LOG_OUTPUT_DEBUG_UART) && OPENTHREAD_POSIX
 
-void Interpreter::ProcessLogFilename(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessLogFilename(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1208,7 +1208,7 @@ exit:
 }
 #endif
 
-void Interpreter::ProcessExtPanId(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessExtPanId(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1231,7 +1231,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessFactoryReset(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessFactoryReset(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -1239,7 +1239,7 @@ void Interpreter::ProcessFactoryReset(int aArgsLength, char *aArgs[])
     otInstanceFactoryReset(mInstance);
 }
 
-void Interpreter::ProcessIfconfig(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessIfconfig(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1271,7 +1271,7 @@ exit:
     AppendResult(error);
 }
 
-otError Interpreter::ProcessIpAddrAdd(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessIpAddrAdd(uint8_t aArgsLength, char *aArgs[])
 {
     otError        error;
     otNetifAddress aAddress;
@@ -1288,7 +1288,7 @@ exit:
     return error;
 }
 
-otError Interpreter::ProcessIpAddrDel(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessIpAddrDel(uint8_t aArgsLength, char *aArgs[])
 {
     otError             error;
     struct otIp6Address address;
@@ -1302,7 +1302,7 @@ exit:
     return error;
 }
 
-void Interpreter::ProcessIpAddr(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessIpAddr(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1351,7 +1351,7 @@ exit:
     AppendResult(error);
 }
 
-otError Interpreter::ProcessIpMulticastAddrAdd(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessIpMulticastAddrAdd(uint8_t aArgsLength, char *aArgs[])
 {
     otError             error;
     struct otIp6Address address;
@@ -1365,7 +1365,7 @@ exit:
     return error;
 }
 
-otError Interpreter::ProcessIpMulticastAddrDel(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessIpMulticastAddrDel(uint8_t aArgsLength, char *aArgs[])
 {
     otError             error;
     struct otIp6Address address;
@@ -1379,7 +1379,7 @@ exit:
     return error;
 }
 
-otError Interpreter::ProcessMulticastPromiscuous(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessMulticastPromiscuous(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1414,7 +1414,7 @@ exit:
     return error;
 }
 
-void Interpreter::ProcessIpMulticastAddr(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessIpMulticastAddr(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1450,7 +1450,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessKeySequence(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessKeySequence(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -1490,7 +1490,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessLeaderData(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessLeaderData(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -1511,7 +1511,7 @@ exit:
 }
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessLeaderPartitionId(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessLeaderPartitionId(uint8_t aArgsLength, char *aArgs[])
 {
     otError       error = OT_ERROR_NONE;
     unsigned long value;
@@ -1530,7 +1530,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessLeaderWeight(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessLeaderWeight(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -1551,7 +1551,7 @@ exit:
 #endif // OPENTHREAD_FTD
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessPskc(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessPskc(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1579,7 +1579,7 @@ exit:
 }
 #endif
 
-void Interpreter::ProcessMasterKey(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessMasterKey(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1606,7 +1606,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessMode(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessMode(uint8_t aArgsLength, char *aArgs[])
 {
     otError          error = OT_ERROR_NONE;
     otLinkModeConfig linkMode;
@@ -1674,7 +1674,7 @@ exit:
 }
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessNeighbor(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessNeighbor(uint8_t aArgsLength, char *aArgs[])
 {
     otError                error = OT_ERROR_NONE;
     otNeighborInfo         neighborInfo;
@@ -1733,7 +1733,7 @@ exit:
 }
 #endif
 
-void Interpreter::ProcessNetworkDataShow(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessNetworkDataShow(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -1752,7 +1752,7 @@ exit:
 }
 
 #if OPENTHREAD_CONFIG_TMF_NETDATA_SERVICE_ENABLE
-void Interpreter::ProcessService(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessService(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1806,7 +1806,7 @@ exit:
 #endif
 
 #if OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE || OPENTHREAD_CONFIG_TMF_NETDATA_SERVICE_ENABLE
-void Interpreter::ProcessNetworkDataRegister(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessNetworkDataRegister(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -1824,7 +1824,7 @@ exit:
 #endif // OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE || OPENTHREAD_CONFIG_TMF_NETDATA_SERVICE_ENABLE
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessNetworkIdTimeout(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessNetworkIdTimeout(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -1844,7 +1844,7 @@ exit:
 }
 #endif // OPENTHREAD_FTD
 
-void Interpreter::ProcessNetworkName(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessNetworkName(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -1863,7 +1863,7 @@ exit:
 }
 
 #if OPENTHREAD_CONFIG_TIME_SYNC_ENABLE
-void Interpreter::ProcessNetworkTime(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessNetworkTime(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -1916,7 +1916,7 @@ exit:
 }
 #endif // OPENTHREAD_CONFIG_TIME_SYNC_ENABLE
 
-void Interpreter::ProcessPanId(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessPanId(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -1935,7 +1935,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessParent(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessParent(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -1963,7 +1963,7 @@ exit:
 }
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessParentPriority(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessParentPriority(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -2018,7 +2018,7 @@ exit:
     return;
 }
 
-void Interpreter::ProcessPing(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessPing(uint8_t aArgsLength, char *aArgs[])
 {
     otError  error = OT_ERROR_NONE;
     uint8_t  index = 1;
@@ -2129,7 +2129,7 @@ exit:
     }
 }
 
-void Interpreter::ProcessPollPeriod(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessPollPeriod(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -2148,7 +2148,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessPromiscuous(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessPromiscuous(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -2259,11 +2259,11 @@ void Interpreter::HandleLinkPcapReceive(const otRadioFrame *aFrame, bool aIsTx)
 }
 
 #if OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE
-otError Interpreter::ProcessPrefixAdd(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessPrefixAdd(uint8_t aArgsLength, char *aArgs[])
 {
     otError              error = OT_ERROR_NONE;
     otBorderRouterConfig config;
-    int                  argcur = 0;
+    uint8_t              argcur = 0;
     char *               prefixLengthStr;
 
     VerifyOrExit(aArgsLength > 0, error = OT_ERROR_INVALID_ARGS);
@@ -2349,13 +2349,13 @@ exit:
     return error;
 }
 
-otError Interpreter::ProcessPrefixRemove(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessPrefixRemove(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
 
     otError            error = OT_ERROR_NONE;
     struct otIp6Prefix prefix;
-    int                argcur = 0;
+    uint8_t            argcur = 0;
     char *             prefixLengthStr;
 
     VerifyOrExit(aArgsLength > 0, error = OT_ERROR_INVALID_ARGS);
@@ -2450,7 +2450,7 @@ otError Interpreter::ProcessPrefixList(void)
     return OT_ERROR_NONE;
 }
 
-void Interpreter::ProcessPrefix(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessPrefix(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -2477,7 +2477,7 @@ exit:
 #endif // OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessPreferRouterId(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessPreferRouterId(uint8_t aArgsLength, char *aArgs[])
 {
     otError       error = OT_ERROR_NONE;
     unsigned long value;
@@ -2490,7 +2490,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessReleaseRouterId(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessReleaseRouterId(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -2505,7 +2505,7 @@ exit:
 }
 #endif // OPENTHREAD_FTD
 
-void Interpreter::ProcessReset(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessReset(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -2513,7 +2513,7 @@ void Interpreter::ProcessReset(int aArgsLength, char *aArgs[])
     otInstanceReset(mInstance);
 }
 
-void Interpreter::ProcessRloc16(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessRloc16(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -2523,11 +2523,11 @@ void Interpreter::ProcessRloc16(int aArgsLength, char *aArgs[])
 }
 
 #if OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE
-otError Interpreter::ProcessRouteAdd(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessRouteAdd(uint8_t aArgsLength, char *aArgs[])
 {
     otError               error = OT_ERROR_NONE;
     otExternalRouteConfig config;
-    int                   argcur = 0;
+    uint8_t               argcur = 0;
     char *                prefixLengthStr;
 
     memset(&config, 0, sizeof(otExternalRouteConfig));
@@ -2582,11 +2582,11 @@ exit:
     return error;
 }
 
-otError Interpreter::ProcessRouteRemove(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessRouteRemove(uint8_t aArgsLength, char *aArgs[])
 {
     otError            error = OT_ERROR_NONE;
     struct otIp6Prefix prefix;
-    int                argcur = 0;
+    uint8_t            argcur = 0;
     char *             prefixLengthStr;
 
     memset(&prefix, 0, sizeof(struct otIp6Prefix));
@@ -2651,7 +2651,7 @@ otError Interpreter::ProcessRouteList(void)
     return OT_ERROR_NONE;
 }
 
-void Interpreter::ProcessRoute(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessRoute(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -2678,7 +2678,7 @@ exit:
 #endif // OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessRouter(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessRouter(uint8_t aArgsLength, char *aArgs[])
 {
     otError      error = OT_ERROR_NONE;
     otRouterInfo routerInfo;
@@ -2771,7 +2771,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessRouterDowngradeThreshold(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessRouterDowngradeThreshold(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -2790,7 +2790,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessRouterEligible(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessRouterEligible(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -2822,7 +2822,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessRouterSelectionJitter(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessRouterSelectionJitter(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -2842,7 +2842,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessRouterUpgradeThreshold(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessRouterUpgradeThreshold(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -2862,7 +2862,7 @@ exit:
 }
 #endif // OPENTHREAD_FTD
 
-void Interpreter::ProcessScan(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessScan(uint8_t aArgsLength, char *aArgs[])
 {
     otError  error        = OT_ERROR_NONE;
     uint32_t scanChannels = 0;
@@ -2965,7 +2965,7 @@ exit:
     return;
 }
 
-void Interpreter::ProcessSingleton(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessSingleton(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -2985,7 +2985,7 @@ void Interpreter::ProcessSingleton(int aArgsLength, char *aArgs[])
 }
 
 #if OPENTHREAD_CONFIG_SNTP_CLIENT_ENABLE
-void Interpreter::ProcessSntp(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessSntp(uint8_t aArgsLength, char *aArgs[])
 {
     otError          error = OT_ERROR_NONE;
     long             port  = OT_SNTP_DEFAULT_SERVER_PORT;
@@ -3058,7 +3058,7 @@ void Interpreter::HandleSntpResponse(uint64_t aTime, otError aResult)
 }
 #endif
 
-void Interpreter::ProcessState(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessState(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -3126,7 +3126,7 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessThread(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessThread(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -3156,14 +3156,14 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessDataset(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessDataset(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     error = mDataset.Process(aArgsLength, aArgs);
     AppendResult(error);
 }
 
-void Interpreter::ProcessTxPower(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessTxPower(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -3186,14 +3186,14 @@ exit:
     AppendResult(error);
 }
 
-void Interpreter::ProcessUdp(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessUdp(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     error = mUdp.Process(aArgsLength, aArgs);
     AppendResult(error);
 }
 
-void Interpreter::ProcessVersion(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessVersion(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -3205,7 +3205,7 @@ void Interpreter::ProcessVersion(int aArgsLength, char *aArgs[])
 
 #if OPENTHREAD_CONFIG_COMMISSIONER_ENABLE && OPENTHREAD_FTD
 
-void Interpreter::ProcessCommissioner(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessCommissioner(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     error = mCommissioner.Process(aArgsLength, aArgs);
@@ -3216,7 +3216,7 @@ void Interpreter::ProcessCommissioner(int aArgsLength, char *aArgs[])
 
 #if OPENTHREAD_CONFIG_JOINER_ENABLE
 
-void Interpreter::ProcessJoiner(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessJoiner(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     error = mJoiner.Process(aArgsLength, aArgs);
@@ -3226,7 +3226,7 @@ void Interpreter::ProcessJoiner(int aArgsLength, char *aArgs[])
 #endif
 
 #if OPENTHREAD_FTD
-void Interpreter::ProcessJoinerPort(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessJoinerPort(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -3247,7 +3247,7 @@ exit:
 #endif
 
 #if OPENTHREAD_CONFIG_MAC_FILTER_ENABLE
-void Interpreter::ProcessMacFilter(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessMacFilter(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -3335,7 +3335,7 @@ void Interpreter::PrintMacFilter(void)
     }
 }
 
-otError Interpreter::ProcessMacFilterAddress(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessMacFilterAddress(uint8_t aArgsLength, char *aArgs[])
 {
     otError                error = OT_ERROR_NONE;
     otExtAddress           extAddr;
@@ -3430,7 +3430,7 @@ exit:
     return error;
 }
 
-otError Interpreter::ProcessMacFilterRss(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessMacFilterRss(uint8_t aArgsLength, char *aArgs[])
 {
     otError             error = OT_ERROR_NONE;
     otMacFilterEntry    entry;
@@ -3539,7 +3539,7 @@ exit:
 
 #endif // OPENTHREAD_CONFIG_MAC_FILTER_ENABLE
 
-void Interpreter::ProcessMac(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessMac(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -3558,7 +3558,7 @@ exit:
     AppendResult(error);
 }
 
-otError Interpreter::ProcessMacRetries(int aArgsLength, char *aArgs[])
+otError Interpreter::ProcessMacRetries(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -3608,7 +3608,7 @@ exit:
 }
 
 #if OPENTHREAD_CONFIG_DIAG_ENABLE
-void Interpreter::ProcessDiag(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessDiag(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     char    output[OPENTHREAD_CONFIG_DIAG_OUTPUT_BUFFER_SIZE];
@@ -3678,7 +3678,7 @@ exit:
 }
 
 #if OPENTHREAD_FTD || OPENTHREAD_CONFIG_TMF_NETWORK_DIAG_MTD_ENABLE
-void Interpreter::ProcessNetworkDiagnostic(int aArgsLength, char *aArgs[])
+void Interpreter::ProcessNetworkDiagnostic(uint8_t aArgsLength, char *aArgs[])
 {
     otError             error = OT_ERROR_NONE;
     struct otIp6Address address;
diff --git a/src/cli/cli.hpp b/src/cli/cli.hpp
index 153589fa7..34f00f8bc 100644
--- a/src/cli/cli.hpp
+++ b/src/cli/cli.hpp
@@ -85,8 +85,8 @@ class Server;
  */
 struct Command
 {
-    const char *mName;                                             ///< A pointer to the command string.
-    void (Interpreter::*mCommand)(int aArgsLength, char *aArgs[]); ///< A function pointer to process the command.
+    const char *mName;                                                 ///< A pointer to the command string.
+    void (Interpreter::*mCommand)(uint8_t aArgsLength, char *aArgs[]); ///< A function pointer to process the command.
 };
 
 /**
@@ -200,149 +200,149 @@ private:
     };
 
     otError ParsePingInterval(const char *aString, uint32_t &aInterval);
-    void    ProcessHelp(int aArgsLength, char *aArgs[]);
-    void    ProcessBufferInfo(int aArgsLength, char *aArgs[]);
-    void    ProcessChannel(int aArgsLength, char *aArgs[]);
+    void    ProcessHelp(uint8_t aArgsLength, char *aArgs[]);
+    void    ProcessBufferInfo(uint8_t aArgsLength, char *aArgs[]);
+    void    ProcessChannel(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_FTD
-    void ProcessChild(int aArgsLength, char *aArgs[]);
-    void ProcessChildIp(int aArgsLength, char *aArgs[]);
-    void ProcessChildMax(int aArgsLength, char *aArgs[]);
+    void ProcessChild(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessChildIp(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessChildMax(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessChildTimeout(int aArgsLength, char *aArgs[]);
+    void ProcessChildTimeout(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_COAP_API_ENABLE
-    void ProcessCoap(int aArgsLength, char *aArgs[]);
+    void ProcessCoap(uint8_t aArgsLength, char *aArgs[]);
 #endif // OPENTHREAD_CONFIG_COAP_API_ENABLE
 #if OPENTHREAD_CONFIG_COAP_SECURE_API_ENABLE
-    void ProcessCoapSecure(int aArgsLength, char *aArgs[]);
+    void ProcessCoapSecure(uint8_t aArgsLength, char *aArgs[]);
 #endif // OPENTHREAD_CONFIG_COAP_API_ENABLE
 #if OPENTHREAD_CONFIG_PLATFORM_RADIO_COEX_ENABLE
-    void ProcessCoexMetrics(int aArgsLength, char *aArgs[]);
+    void ProcessCoexMetrics(uint8_t aArgsLength, char *aArgs[]);
 #endif
 #if OPENTHREAD_CONFIG_COMMISSIONER_ENABLE && OPENTHREAD_FTD
-    void ProcessCommissioner(int aArgsLength, char *aArgs[]);
+    void ProcessCommissioner(uint8_t aArgsLength, char *aArgs[]);
 #endif
 #if OPENTHREAD_FTD
-    void ProcessContextIdReuseDelay(int aArgsLength, char *aArgs[]);
+    void ProcessContextIdReuseDelay(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessCounters(int aArgsLength, char *aArgs[]);
+    void ProcessCounters(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_FTD
-    void ProcessDelayTimerMin(int aArgsLength, char *aArgs[]);
+    void ProcessDelayTimerMin(uint8_t aArgsLength, char *aArgs[]);
 #endif
 #if OPENTHREAD_CONFIG_DIAG_ENABLE
-    void ProcessDiag(int aArgsLength, char *aArgs[]);
+    void ProcessDiag(uint8_t aArgsLength, char *aArgs[]);
 #endif // OPENTHREAD_CONFIG_DIAG_ENABLE
-    void ProcessDiscover(int aArgsLength, char *aArgs[]);
+    void ProcessDiscover(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_DNS_CLIENT_ENABLE
-    void ProcessDns(int aArgsLength, char *aArgs[]);
+    void ProcessDns(uint8_t aArgsLength, char *aArgs[]);
 #endif
 #if OPENTHREAD_FTD
-    void ProcessEidCache(int aArgsLength, char *aArgs[]);
+    void ProcessEidCache(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessEui64(int aArgsLength, char *aArgs[]);
+    void ProcessEui64(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_POSIX
-    void ProcessExit(int aArgsLength, char *aArgs[]);
+    void ProcessExit(uint8_t aArgsLength, char *aArgs[]);
 #endif
 #if (OPENTHREAD_CONFIG_LOG_OUTPUT == OPENTHREAD_CONFIG_LOG_OUTPUT_DEBUG_UART) && OPENTHREAD_POSIX
-    void ProcessLogFilename(int aArgsLength, char *aArgs[]);
+    void ProcessLogFilename(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void    ProcessExtAddress(int aArgsLength, char *aArgs[]);
-    void    ProcessExtPanId(int aArgsLength, char *aArgs[]);
-    void    ProcessFactoryReset(int aArgsLength, char *aArgs[]);
-    void    ProcessIfconfig(int aArgsLength, char *aArgs[]);
-    void    ProcessIpAddr(int aArgsLength, char *aArgs[]);
-    otError ProcessIpAddrAdd(int aArgsLength, char *aArgs[]);
-    otError ProcessIpAddrDel(int aArgsLength, char *aArgs[]);
-    void    ProcessIpMulticastAddr(int aArgsLength, char *aArgs[]);
-    otError ProcessIpMulticastAddrAdd(int aArgsLength, char *aArgs[]);
-    otError ProcessIpMulticastAddrDel(int aArgsLength, char *aArgs[]);
-    otError ProcessMulticastPromiscuous(int aArgsLength, char *aArgs[]);
+    void    ProcessExtAddress(uint8_t aArgsLength, char *aArgs[]);
+    void    ProcessExtPanId(uint8_t aArgsLength, char *aArgs[]);
+    void    ProcessFactoryReset(uint8_t aArgsLength, char *aArgs[]);
+    void    ProcessIfconfig(uint8_t aArgsLength, char *aArgs[]);
+    void    ProcessIpAddr(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessIpAddrAdd(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessIpAddrDel(uint8_t aArgsLength, char *aArgs[]);
+    void    ProcessIpMulticastAddr(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessIpMulticastAddrAdd(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessIpMulticastAddrDel(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMulticastPromiscuous(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_JOINER_ENABLE
-    void ProcessJoiner(int aArgsLength, char *aArgs[]);
+    void ProcessJoiner(uint8_t aArgsLength, char *aArgs[]);
 #endif
 #if OPENTHREAD_FTD
-    void ProcessJoinerPort(int aArgsLength, char *aArgs[]);
+    void ProcessJoinerPort(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessKeySequence(int aArgsLength, char *aArgs[]);
-    void ProcessLeaderData(int aArgsLength, char *aArgs[]);
+    void ProcessKeySequence(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessLeaderData(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_FTD
-    void ProcessLeaderPartitionId(int aArgsLength, char *aArgs[]);
-    void ProcessLeaderWeight(int aArgsLength, char *aArgs[]);
+    void ProcessLeaderPartitionId(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessLeaderWeight(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessMasterKey(int aArgsLength, char *aArgs[]);
-    void ProcessMode(int aArgsLength, char *aArgs[]);
+    void ProcessMasterKey(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessMode(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_FTD
-    void ProcessNeighbor(int aArgsLength, char *aArgs[]);
+    void ProcessNeighbor(uint8_t aArgsLength, char *aArgs[]);
 #endif
 #if OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE || OPENTHREAD_CONFIG_TMF_NETDATA_SERVICE_ENABLE
-    void ProcessNetworkDataRegister(int aArgsLength, char *aArgs[]);
+    void ProcessNetworkDataRegister(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessNetworkDataShow(int aArgsLength, char *aArgs[]);
+    void ProcessNetworkDataShow(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_TMF_NETDATA_SERVICE_ENABLE
-    void ProcessService(int aArgsLength, char *aArgs[]);
+    void ProcessService(uint8_t aArgsLength, char *aArgs[]);
 #endif
 #if OPENTHREAD_FTD || OPENTHREAD_CONFIG_TMF_NETWORK_DIAG_MTD_ENABLE
-    void ProcessNetworkDiagnostic(int aArgsLength, char *aArgs[]);
+    void ProcessNetworkDiagnostic(uint8_t aArgsLength, char *aArgs[]);
 #endif // OPENTHREAD_FTD || OPENTHREAD_CONFIG_TMF_NETWORK_DIAG_MTD_ENABLE
 #if OPENTHREAD_FTD
-    void ProcessNetworkIdTimeout(int aArgsLength, char *aArgs[]);
+    void ProcessNetworkIdTimeout(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessNetworkName(int aArgsLength, char *aArgs[]);
+    void ProcessNetworkName(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_TIME_SYNC_ENABLE
-    void ProcessNetworkTime(int aArgsLength, char *aArgs[]);
+    void ProcessNetworkTime(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessPanId(int aArgsLength, char *aArgs[]);
-    void ProcessParent(int aArgsLength, char *aArgs[]);
+    void ProcessPanId(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessParent(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_FTD
-    void ProcessParentPriority(int aArgsLength, char *aArgs[]);
+    void ProcessParentPriority(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessPing(int aArgsLength, char *aArgs[]);
-    void ProcessPollPeriod(int aArgsLength, char *aArgs[]);
+    void ProcessPing(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessPollPeriod(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE
-    void    ProcessPrefix(int aArgsLength, char *aArgs[]);
-    otError ProcessPrefixAdd(int aArgsLength, char *aArgs[]);
-    otError ProcessPrefixRemove(int aArgsLength, char *aArgs[]);
+    void    ProcessPrefix(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessPrefixAdd(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessPrefixRemove(uint8_t aArgsLength, char *aArgs[]);
     otError ProcessPrefixList(void);
 #endif
-    void ProcessPromiscuous(int aArgsLength, char *aArgs[]);
+    void ProcessPromiscuous(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_FTD
-    void ProcessPreferRouterId(int aArgsLength, char *aArgs[]);
-    void ProcessPskc(int aArgsLength, char *aArgs[]);
-    void ProcessReleaseRouterId(int aArgsLength, char *aArgs[]);
+    void ProcessPreferRouterId(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessPskc(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessReleaseRouterId(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessReset(int aArgsLength, char *aArgs[]);
+    void ProcessReset(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_BORDER_ROUTER_ENABLE
-    void    ProcessRoute(int aArgsLength, char *aArgs[]);
-    otError ProcessRouteAdd(int aArgsLength, char *aArgs[]);
-    otError ProcessRouteRemove(int aArgsLength, char *aArgs[]);
+    void    ProcessRoute(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessRouteAdd(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessRouteRemove(uint8_t aArgsLength, char *aArgs[]);
     otError ProcessRouteList(void);
 #endif
 #if OPENTHREAD_FTD
-    void ProcessRouter(int aArgsLength, char *aArgs[]);
-    void ProcessRouterDowngradeThreshold(int aArgsLength, char *aArgs[]);
-    void ProcessRouterEligible(int aArgsLength, char *aArgs[]);
-    void ProcessRouterSelectionJitter(int aArgsLength, char *aArgs[]);
-    void ProcessRouterUpgradeThreshold(int aArgsLength, char *aArgs[]);
+    void ProcessRouter(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessRouterDowngradeThreshold(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessRouterEligible(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessRouterSelectionJitter(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessRouterUpgradeThreshold(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessRloc16(int aArgsLength, char *aArgs[]);
-    void ProcessScan(int aArgsLength, char *aArgs[]);
-    void ProcessSingleton(int aArgsLength, char *aArgs[]);
+    void ProcessRloc16(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessScan(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessSingleton(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_SNTP_CLIENT_ENABLE
-    void ProcessSntp(int aArgsLength, char *aArgs[]);
+    void ProcessSntp(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    void ProcessState(int aArgsLength, char *aArgs[]);
-    void ProcessThread(int aArgsLength, char *aArgs[]);
-    void ProcessDataset(int aArgsLength, char *aArgs[]);
-    void ProcessTxPower(int aArgsLength, char *aArgs[]);
-    void ProcessUdp(int aArgsLength, char *aArgs[]);
-    void ProcessVersion(int aArgsLength, char *aArgs[]);
+    void ProcessState(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessThread(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessDataset(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessTxPower(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessUdp(uint8_t aArgsLength, char *aArgs[]);
+    void ProcessVersion(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_MAC_FILTER_ENABLE
-    void    ProcessMacFilter(int aArgsLength, char *aArgs[]);
+    void    ProcessMacFilter(uint8_t aArgsLength, char *aArgs[]);
     void    PrintMacFilter(void);
-    otError ProcessMacFilterAddress(int aArgsLength, char *aArgs[]);
-    otError ProcessMacFilterRss(int aArgsLength, char *aArgs[]);
+    otError ProcessMacFilterAddress(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMacFilterRss(uint8_t aArgsLength, char *aArgs[]);
 #endif // OPENTHREAD_CONFIG_MAC_FILTER_ENABLE
-    void    ProcessMac(int aArgsLength, char *aArgs[]);
-    otError ProcessMacRetries(int aArgsLength, char *aArgs[]);
+    void    ProcessMac(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMacRetries(uint8_t aArgsLength, char *aArgs[]);
 
     static void HandleIcmpReceive(void *               aContext,
                                   otMessage *          aMessage,
diff --git a/src/cli/cli_coap.cpp b/src/cli/cli_coap.cpp
index 5b0e8863b..33830d579 100644
--- a/src/cli/cli_coap.cpp
+++ b/src/cli/cli_coap.cpp
@@ -158,7 +158,7 @@ void Coap::PrintPayload(otMessage *aMessage) const
 }
 
 #if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
-otError Coap::ProcessCancel(int aArgsLength, char *aArgs[])
+otError Coap::ProcessCancel(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -167,7 +167,7 @@ otError Coap::ProcessCancel(int aArgsLength, char *aArgs[])
 }
 #endif
 
-otError Coap::ProcessHelp(int aArgsLength, char *aArgs[])
+otError Coap::ProcessHelp(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -180,7 +180,7 @@ otError Coap::ProcessHelp(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError Coap::ProcessResource(int aArgsLength, char *aArgs[])
+otError Coap::ProcessResource(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -204,7 +204,7 @@ exit:
     return OT_ERROR_NONE;
 }
 
-otError Coap::ProcessSet(int aArgsLength, char *aArgs[])
+otError Coap::ProcessSet(uint8_t aArgsLength, char *aArgs[])
 {
 #if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
     otMessage *   notificationMessage = NULL;
@@ -265,7 +265,7 @@ exit:
     return error;
 }
 
-otError Coap::ProcessStart(int aArgsLength, char *aArgs[])
+otError Coap::ProcessStart(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -273,7 +273,7 @@ otError Coap::ProcessStart(int aArgsLength, char *aArgs[])
     return otCoapStart(mInterpreter.mInstance, OT_DEFAULT_COAP_PORT);
 }
 
-otError Coap::ProcessStop(int aArgsLength, char *aArgs[])
+otError Coap::ProcessStop(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -283,7 +283,7 @@ otError Coap::ProcessStop(int aArgsLength, char *aArgs[])
     return otCoapStop(mInterpreter.mInstance);
 }
 
-otError Coap::ProcessParameters(int aArgsLength, char *aArgs[])
+otError Coap::ProcessParameters(uint8_t aArgsLength, char *aArgs[])
 {
     otError             error = OT_ERROR_NONE;
     bool *              defaultTxParameters;
@@ -356,7 +356,7 @@ exit:
     return error;
 }
 
-otError Coap::ProcessRequest(int aArgsLength, char *aArgs[])
+otError Coap::ProcessRequest(uint8_t aArgsLength, char *aArgs[])
 {
     otError       error   = OT_ERROR_NONE;
     otMessage *   message = NULL;
@@ -510,7 +510,7 @@ exit:
     return error;
 }
 
-otError Coap::Process(int aArgsLength, char *aArgs[])
+otError Coap::Process(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_INVALID_COMMAND;
 
diff --git a/src/cli/cli_coap.hpp b/src/cli/cli_coap.hpp
index 88afe839e..e9b39acfa 100644
--- a/src/cli/cli_coap.hpp
+++ b/src/cli/cli_coap.hpp
@@ -67,7 +67,7 @@ public:
      * @param[in]  aArgs        An array of command line arguments.
      *
      */
-    otError Process(int aArgsLength, char *aArgs[]);
+    otError Process(uint8_t aArgsLength, char *aArgs[]);
 
 private:
     enum
@@ -79,7 +79,7 @@ private:
     struct Command
     {
         const char *mName;
-        otError (Coap::*mCommand)(int aArgsLength, char *aArgs[]);
+        otError (Coap::*mCommand)(uint8_t aArgsLength, char *aArgs[]);
     };
 
 #if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
@@ -89,16 +89,16 @@ private:
 
     void PrintPayload(otMessage *aMessage) const;
 
-    otError ProcessHelp(int aArgsLength, char *aArgs[]);
+    otError ProcessHelp(uint8_t aArgsLength, char *aArgs[]);
 #if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
-    otError ProcessCancel(int aArgsLength, char *aArgs[]);
+    otError ProcessCancel(uint8_t aArgsLength, char *aArgs[]);
 #endif
-    otError ProcessParameters(int aArgsLength, char *aArgs[]);
-    otError ProcessRequest(int aArgsLength, char *aArgs[]);
-    otError ProcessResource(int aArgsLength, char *aArgs[]);
-    otError ProcessSet(int aArgsLength, char *aArgs[]);
-    otError ProcessStart(int aArgsLength, char *aArgs[]);
-    otError ProcessStop(int aArgsLength, char *aArgs[]);
+    otError ProcessParameters(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessRequest(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessResource(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessSet(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessStart(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessStop(uint8_t aArgsLength, char *aArgs[]);
 
     static void HandleRequest(void *aContext, otMessage *aMessage, const otMessageInfo *aMessageInfo);
     void        HandleRequest(otMessage *aMessage, const otMessageInfo *aMessageInfo);
diff --git a/src/cli/cli_coap_secure.cpp b/src/cli/cli_coap_secure.cpp
index d8e2c2d4a..17cf24b23 100644
--- a/src/cli/cli_coap_secure.cpp
+++ b/src/cli/cli_coap_secure.cpp
@@ -98,7 +98,7 @@ void CoapSecure::PrintPayload(otMessage *aMessage) const
     mInterpreter.mServer->OutputFormat("\r\n");
 }
 
-otError CoapSecure::ProcessHelp(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessHelp(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -111,7 +111,7 @@ otError CoapSecure::ProcessHelp(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError CoapSecure::ProcessResource(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessResource(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -135,7 +135,7 @@ exit:
     return OT_ERROR_NONE;
 }
 
-otError CoapSecure::ProcessStart(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessStart(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     bool    verifyPeerCert = true;
@@ -165,7 +165,7 @@ exit:
     return error;
 }
 
-otError CoapSecure::ProcessStop(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessStop(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -185,7 +185,7 @@ otError CoapSecure::ProcessStop(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError CoapSecure::ProcessRequest(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessRequest(uint8_t aArgsLength, char *aArgs[])
 {
     otError       error   = OT_ERROR_NONE;
     otMessage *   message = NULL;
@@ -305,7 +305,7 @@ exit:
     return error;
 }
 
-otError CoapSecure::ProcessConnect(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessConnect(uint8_t aArgsLength, char *aArgs[])
 {
     otError    error;
     otSockAddr sockaddr;
@@ -333,7 +333,7 @@ exit:
     return error;
 }
 
-otError CoapSecure::ProcessDisconnect(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessDisconnect(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -344,7 +344,7 @@ otError CoapSecure::ProcessDisconnect(int aArgsLength, char *aArgs[])
 }
 
 #ifdef MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
-otError CoapSecure::ProcessPsk(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessPsk(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     size_t  length;
@@ -370,7 +370,7 @@ exit:
 #endif // MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
 
 #ifdef MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
-otError CoapSecure::ProcessX509(int aArgsLength, char *aArgs[])
+otError CoapSecure::ProcessX509(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -387,7 +387,7 @@ otError CoapSecure::ProcessX509(int aArgsLength, char *aArgs[])
 }
 #endif
 
-otError CoapSecure::Process(int aArgsLength, char *aArgs[])
+otError CoapSecure::Process(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_INVALID_COMMAND;
 
diff --git a/src/cli/cli_coap_secure.hpp b/src/cli/cli_coap_secure.hpp
index e68a9799a..660c79f21 100644
--- a/src/cli/cli_coap_secure.hpp
+++ b/src/cli/cli_coap_secure.hpp
@@ -72,7 +72,7 @@ public:
      * @param[in]  aArgs        An array of command line arguments.
      *
      */
-    otError Process(int aArgsLength, char *aArgs[]);
+    otError Process(uint8_t aArgsLength, char *aArgs[]);
 
 private:
     enum
@@ -86,20 +86,20 @@ private:
     struct Command
     {
         const char *mName;
-        otError (CoapSecure::*mCommand)(int aArgsLength, char *aArgs[]);
+        otError (CoapSecure::*mCommand)(uint8_t aArgsLength, char *aArgs[]);
     };
 
     void PrintPayload(otMessage *aMessage) const;
 
-    otError ProcessHelp(int aArgsLength, char *aArgs[]);
-    otError ProcessConnect(int aArgsLength, char *aArgs[]);
-    otError ProcessDisconnect(int aArgsLength, char *aArgs[]);
-    otError ProcessPsk(int aArgsLength, char *aArgs[]);
-    otError ProcessRequest(int aArgsLength, char *aArgs[]);
-    otError ProcessResource(int aArgsLength, char *aArgs[]);
-    otError ProcessStart(int aArgsLength, char *aArgs[]);
-    otError ProcessStop(int aArgsLength, char *aArgs[]);
-    otError ProcessX509(int aArgsLength, char *aArgs[]);
+    otError ProcessHelp(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessConnect(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessDisconnect(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessPsk(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessRequest(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessResource(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessStart(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessStop(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessX509(uint8_t aArgsLength, char *aArgs[]);
 
     void Stop(void);
 
diff --git a/src/cli/cli_commissioner.cpp b/src/cli/cli_commissioner.cpp
index c0648830b..065c62066 100644
--- a/src/cli/cli_commissioner.cpp
+++ b/src/cli/cli_commissioner.cpp
@@ -50,7 +50,7 @@ const struct Commissioner::Command Commissioner::sCommands[] = {
     {"stop", &Commissioner::ProcessStop},
 };
 
-otError Commissioner::ProcessHelp(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessHelp(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -63,7 +63,7 @@ otError Commissioner::ProcessHelp(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError Commissioner::ProcessAnnounce(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessAnnounce(uint8_t aArgsLength, char *aArgs[])
 {
     otError      error;
     long         mask;
@@ -86,7 +86,7 @@ exit:
     return error;
 }
 
-otError Commissioner::ProcessEnergy(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessEnergy(uint8_t aArgsLength, char *aArgs[])
 {
     otError      error;
     long         mask;
@@ -112,7 +112,7 @@ exit:
     return error;
 }
 
-otError Commissioner::ProcessJoiner(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessJoiner(uint8_t aArgsLength, char *aArgs[])
 {
     otError             error;
     otExtAddress        addr;
@@ -158,7 +158,7 @@ exit:
     return error;
 }
 
-otError Commissioner::ProcessMgmtGet(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessMgmtGet(uint8_t aArgsLength, char *aArgs[])
 {
     otError error;
     uint8_t tlvs[32];
@@ -207,7 +207,7 @@ exit:
     return error;
 }
 
-otError Commissioner::ProcessMgmtSet(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessMgmtSet(uint8_t aArgsLength, char *aArgs[])
 {
     otError                error;
     otCommissioningDataset dataset;
@@ -277,7 +277,7 @@ exit:
     return error;
 }
 
-otError Commissioner::ProcessPanId(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessPanId(uint8_t aArgsLength, char *aArgs[])
 {
     otError      error;
     long         panid;
@@ -298,12 +298,12 @@ exit:
     return error;
 }
 
-otError Commissioner::ProcessProvisioningUrl(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessProvisioningUrl(uint8_t aArgsLength, char *aArgs[])
 {
     return otCommissionerSetProvisioningUrl(mInterpreter.mInstance, (aArgsLength > 1) ? aArgs[1] : NULL);
 }
 
-otError Commissioner::ProcessSessionId(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessSessionId(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -313,7 +313,7 @@ otError Commissioner::ProcessSessionId(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError Commissioner::ProcessStart(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessStart(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -378,7 +378,7 @@ void Commissioner::HandleJoinerEvent(otCommissionerJoinerEvent aEvent, const otE
     mInterpreter.mServer->OutputFormat("\r\n");
 }
 
-otError Commissioner::ProcessStop(int aArgsLength, char *aArgs[])
+otError Commissioner::ProcessStop(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -386,7 +386,7 @@ otError Commissioner::ProcessStop(int aArgsLength, char *aArgs[])
     return otCommissionerStop(mInterpreter.mInstance);
 }
 
-otError Commissioner::Process(int aArgsLength, char *aArgs[])
+otError Commissioner::Process(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_INVALID_COMMAND;
 
diff --git a/src/cli/cli_commissioner.hpp b/src/cli/cli_commissioner.hpp
index 54d9ce7c3..92ff28236 100644
--- a/src/cli/cli_commissioner.hpp
+++ b/src/cli/cli_commissioner.hpp
@@ -70,7 +70,7 @@ public:
      * @param[in]  aArgs        An array of command line arguments.
      *
      */
-    otError Process(int aArgsLength, char *aArgs[]);
+    otError Process(uint8_t aArgsLength, char *aArgs[]);
 
 private:
     enum
@@ -81,20 +81,20 @@ private:
     struct Command
     {
         const char *mName;
-        otError (Commissioner::*mCommand)(int aArgsLength, char *aArgs[]);
+        otError (Commissioner::*mCommand)(uint8_t aArgsLength, char *aArgs[]);
     };
 
-    otError ProcessHelp(int aArgsLength, char *aArgs[]);
-    otError ProcessAnnounce(int aArgsLength, char *aArgs[]);
-    otError ProcessEnergy(int aArgsLength, char *aArgs[]);
-    otError ProcessJoiner(int aArgsLength, char *aArgs[]);
-    otError ProcessMgmtGet(int aArgsLength, char *aArgs[]);
-    otError ProcessMgmtSet(int aArgsLength, char *aArgs[]);
-    otError ProcessPanId(int aArgsLength, char *aArgs[]);
-    otError ProcessProvisioningUrl(int aArgsLength, char *aArgs[]);
-    otError ProcessSessionId(int aArgsLength, char *aArgs[]);
-    otError ProcessStart(int aArgsLength, char *aArgs[]);
-    otError ProcessStop(int aArgsLength, char *aArgs[]);
+    otError ProcessHelp(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessAnnounce(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessEnergy(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessJoiner(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMgmtGet(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMgmtSet(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessPanId(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessProvisioningUrl(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessSessionId(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessStart(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessStop(uint8_t aArgsLength, char *aArgs[]);
 
     static void HandleStateChanged(otCommissionerState aState, void *aContext);
     void        HandleStateChanged(otCommissionerState aState);
diff --git a/src/cli/cli_dataset.cpp b/src/cli/cli_dataset.cpp
index 6bf995b2a..35614280c 100644
--- a/src/cli/cli_dataset.cpp
+++ b/src/cli/cli_dataset.cpp
@@ -182,7 +182,7 @@ otError Dataset::Print(otOperationalDataset &aDataset)
     return OT_ERROR_NONE;
 }
 
-otError Dataset::Process(int aArgsLength, char *aArgs[])
+otError Dataset::Process(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_INVALID_COMMAND;
 
@@ -204,7 +204,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessHelp(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessHelp(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -217,7 +217,7 @@ otError Dataset::ProcessHelp(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError Dataset::ProcessInit(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessInit(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -246,7 +246,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessActive(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessActive(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -261,7 +261,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessPending(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessPending(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -276,7 +276,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessActiveTimestamp(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessActiveTimestamp(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -290,7 +290,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessChannel(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessChannel(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -304,7 +304,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessChannelMask(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessChannelMask(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -318,7 +318,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessClear(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessClear(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -327,7 +327,7 @@ otError Dataset::ProcessClear(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError Dataset::ProcessCommit(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessCommit(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
 
@@ -350,7 +350,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessDelay(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessDelay(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -364,7 +364,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessExtPanId(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessExtPanId(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     uint8_t extPanId[OT_EXT_PAN_ID_SIZE];
@@ -379,7 +379,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessMasterKey(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessMasterKey(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     uint8_t key[OT_MASTER_KEY_SIZE];
@@ -395,7 +395,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessMeshLocalPrefix(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessMeshLocalPrefix(uint8_t aArgsLength, char *aArgs[])
 {
     otError      error = OT_ERROR_NONE;
     otIp6Address prefix;
@@ -410,7 +410,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessNetworkName(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessNetworkName(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     size_t  length;
@@ -426,7 +426,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessPanId(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessPanId(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -440,7 +440,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessPendingTimestamp(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessPendingTimestamp(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -454,7 +454,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessMgmtSetCommand(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessMgmtSetCommand(uint8_t aArgsLength, char *aArgs[])
 {
     otError              error = OT_ERROR_NONE;
     otOperationalDataset dataset;
@@ -578,7 +578,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessMgmtGetCommand(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessMgmtGetCommand(uint8_t aArgsLength, char *aArgs[])
 {
     otError                        error = OT_ERROR_NONE;
     otOperationalDatasetComponents datasetComponents;
@@ -675,7 +675,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessPskc(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessPskc(uint8_t aArgsLength, char *aArgs[])
 {
     otError  error = OT_ERROR_NONE;
     uint16_t length;
@@ -692,7 +692,7 @@ exit:
     return error;
 }
 
-otError Dataset::ProcessSecurityPolicy(int aArgsLength, char *aArgs[])
+otError Dataset::ProcessSecurityPolicy(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_NONE;
     long    value;
diff --git a/src/cli/cli_dataset.hpp b/src/cli/cli_dataset.hpp
index 1c9fdc426..80f23da1e 100644
--- a/src/cli/cli_dataset.hpp
+++ b/src/cli/cli_dataset.hpp
@@ -64,38 +64,38 @@ public:
      * @param[in]  aArgs        An array of command line arguments.
      *
      */
-    otError Process(int aArgsLength, char *aArgs[]);
+    otError Process(uint8_t aArgsLength, char *aArgs[]);
 
 private:
     struct Command
     {
         const char *mName;
-        otError (Dataset::*mCommand)(int aArgsLength, char *aArgs[]);
+        otError (Dataset::*mCommand)(uint8_t aArgsLength, char *aArgs[]);
     };
 
     void    OutputBytes(const uint8_t *aBytes, uint8_t aLength);
     otError Print(otOperationalDataset &aDataset);
 
-    otError ProcessHelp(int aArgsLength, char *aArgs[]);
-    otError ProcessActive(int aArgsLength, char *aArgs[]);
-    otError ProcessActiveTimestamp(int aArgsLength, char *aArgs[]);
-    otError ProcessChannel(int aArgsLength, char *aArgs[]);
-    otError ProcessChannelMask(int aArgsLength, char *aArgs[]);
-    otError ProcessClear(int aArgsLength, char *aArgs[]);
-    otError ProcessCommit(int aArgsLength, char *aArgs[]);
-    otError ProcessDelay(int aArgsLength, char *aArgs[]);
-    otError ProcessExtPanId(int aArgsLength, char *aArgs[]);
-    otError ProcessInit(int aArgsLength, char *aArgs[]);
-    otError ProcessMasterKey(int aArgsLength, char *aArgs[]);
-    otError ProcessMeshLocalPrefix(int aArgsLength, char *aArgs[]);
-    otError ProcessNetworkName(int aArgsLength, char *aArgs[]);
-    otError ProcessPanId(int aArgsLength, char *aArgs[]);
-    otError ProcessPending(int aArgsLength, char *aArgs[]);
-    otError ProcessPendingTimestamp(int aArgsLength, char *aArgs[]);
-    otError ProcessMgmtSetCommand(int aArgsLength, char *aArgs[]);
-    otError ProcessMgmtGetCommand(int aArgsLength, char *aArgs[]);
-    otError ProcessPskc(int aArgsLength, char *aArgs[]);
-    otError ProcessSecurityPolicy(int aArgsLength, char *aArgs[]);
+    otError ProcessHelp(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessActive(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessActiveTimestamp(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessChannel(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessChannelMask(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessClear(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessCommit(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessDelay(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessExtPanId(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessInit(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMasterKey(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMeshLocalPrefix(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessNetworkName(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessPanId(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessPending(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessPendingTimestamp(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMgmtSetCommand(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessMgmtGetCommand(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessPskc(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessSecurityPolicy(uint8_t aArgsLength, char *aArgs[]);
 
     Interpreter &mInterpreter;
 
diff --git a/src/cli/cli_joiner.cpp b/src/cli/cli_joiner.cpp
index 5fe79cc45..ff6e52b8f 100644
--- a/src/cli/cli_joiner.cpp
+++ b/src/cli/cli_joiner.cpp
@@ -48,7 +48,7 @@ const struct Joiner::Command Joiner::sCommands[] = {
     {"stop", &Joiner::ProcessStop},
 };
 
-otError Joiner::ProcessHelp(int aArgsLength, char *aArgs[])
+otError Joiner::ProcessHelp(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -61,7 +61,7 @@ otError Joiner::ProcessHelp(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError Joiner::ProcessId(int aArgsLength, char *aArgs[])
+otError Joiner::ProcessId(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -76,7 +76,7 @@ otError Joiner::ProcessId(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError Joiner::ProcessStart(int aArgsLength, char *aArgs[])
+otError Joiner::ProcessStart(uint8_t aArgsLength, char *aArgs[])
 {
     otError     error;
     const char *provisioningUrl = NULL;
@@ -95,7 +95,7 @@ exit:
     return error;
 }
 
-otError Joiner::ProcessStop(int aArgsLength, char *aArgs[])
+otError Joiner::ProcessStop(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -105,7 +105,7 @@ otError Joiner::ProcessStop(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError Joiner::Process(int aArgsLength, char *aArgs[])
+otError Joiner::Process(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_INVALID_COMMAND;
 
diff --git a/src/cli/cli_joiner.hpp b/src/cli/cli_joiner.hpp
index 2ffdc403d..802de29bb 100644
--- a/src/cli/cli_joiner.hpp
+++ b/src/cli/cli_joiner.hpp
@@ -70,19 +70,19 @@ public:
      * @param[in]  aArgs        A pointer to an array of command line arguments.
      *
      */
-    otError Process(int aArgsLength, char *aArgs[]);
+    otError Process(uint8_t aArgsLength, char *aArgs[]);
 
 private:
     struct Command
     {
         const char *mName;
-        otError (Joiner::*mCommand)(int aArgsLength, char *aArgs[]);
+        otError (Joiner::*mCommand)(uint8_t aArgsLength, char *aArgs[]);
     };
 
-    otError ProcessHelp(int aArgsLength, char *aArgs[]);
-    otError ProcessId(int aArgsLength, char *aArgs[]);
-    otError ProcessStart(int aArgsLength, char *aArgs[]);
-    otError ProcessStop(int aArgsLength, char *aArgs[]);
+    otError ProcessHelp(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessId(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessStart(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessStop(uint8_t aArgsLength, char *aArgs[]);
 
     static void HandleCallback(otError aError, void *aContext);
     void        HandleCallback(otError aError);
diff --git a/src/cli/cli_udp.cpp b/src/cli/cli_udp.cpp
index f121a1dea..fb20b3efd 100644
--- a/src/cli/cli_udp.cpp
+++ b/src/cli/cli_udp.cpp
@@ -55,7 +55,7 @@ UdpExample::UdpExample(Interpreter &aInterpreter)
     memset(&mSocket, 0, sizeof(mSocket));
 }
 
-otError UdpExample::ProcessHelp(int aArgsLength, char *aArgs[])
+otError UdpExample::ProcessHelp(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -68,7 +68,7 @@ otError UdpExample::ProcessHelp(int aArgsLength, char *aArgs[])
     return OT_ERROR_NONE;
 }
 
-otError UdpExample::ProcessBind(int aArgsLength, char *aArgs[])
+otError UdpExample::ProcessBind(uint8_t aArgsLength, char *aArgs[])
 {
     otError    error;
     otSockAddr sockaddr;
@@ -92,7 +92,7 @@ exit:
     return error;
 }
 
-otError UdpExample::ProcessConnect(int aArgsLength, char *aArgs[])
+otError UdpExample::ProcessConnect(uint8_t aArgsLength, char *aArgs[])
 {
     otError    error;
     otSockAddr sockaddr;
@@ -116,7 +116,7 @@ exit:
     return error;
 }
 
-otError UdpExample::ProcessClose(int aArgsLength, char *aArgs[])
+otError UdpExample::ProcessClose(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -124,7 +124,7 @@ otError UdpExample::ProcessClose(int aArgsLength, char *aArgs[])
     return otUdpClose(&mSocket);
 }
 
-otError UdpExample::ProcessOpen(int aArgsLength, char *aArgs[])
+otError UdpExample::ProcessOpen(uint8_t aArgsLength, char *aArgs[])
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -132,12 +132,12 @@ otError UdpExample::ProcessOpen(int aArgsLength, char *aArgs[])
     return otUdpOpen(mInterpreter.mInstance, &mSocket, HandleUdpReceive, this);
 }
 
-otError UdpExample::ProcessSend(int aArgsLength, char *aArgs[])
+otError UdpExample::ProcessSend(uint8_t aArgsLength, char *aArgs[])
 {
     otError       error = OT_ERROR_NONE;
     otMessageInfo messageInfo;
     otMessage *   message       = NULL;
-    int           curArg        = 0;
+    uint8_t       curArg        = 0;
     uint16_t      payloadLength = 0;
     PayloadType   payloadType   = kTypeText;
 
@@ -159,7 +159,7 @@ otError UdpExample::ProcessSend(int aArgsLength, char *aArgs[])
 
     if (aArgsLength == 2 || aArgsLength == 4)
     {
-        int typePos = curArg++;
+        uint8_t typePos = curArg++;
 
         if (strcmp(aArgs[typePos], "-s") == 0)
         {
@@ -258,7 +258,7 @@ exit:
     return error;
 }
 
-otError UdpExample::Process(int aArgsLength, char *aArgs[])
+otError UdpExample::Process(uint8_t aArgsLength, char *aArgs[])
 {
     otError error = OT_ERROR_INVALID_COMMAND;
 
diff --git a/src/cli/cli_udp.hpp b/src/cli/cli_udp.hpp
index f94d8e2a7..201b10cee 100644
--- a/src/cli/cli_udp.hpp
+++ b/src/cli/cli_udp.hpp
@@ -65,13 +65,13 @@ public:
      * @param[in]  aArgs        An array of command line arguments.
      *
      */
-    otError Process(int aArgsLength, char *aArgs[]);
+    otError Process(uint8_t aArgsLength, char *aArgs[]);
 
 private:
     struct Command
     {
         const char *mName;
-        otError (UdpExample::*mCommand)(int aArgsLength, char *aArgs[]);
+        otError (UdpExample::*mCommand)(uint8_t aArgsLength, char *aArgs[]);
     };
 
     enum PayloadType
@@ -81,12 +81,12 @@ private:
         kTypeHexString = 2,
     };
 
-    otError ProcessHelp(int aArgsLength, char *aArgs[]);
-    otError ProcessBind(int aArgsLength, char *aArgs[]);
-    otError ProcessClose(int aArgsLength, char *aArgs[]);
-    otError ProcessConnect(int aArgsLength, char *aArgs[]);
-    otError ProcessOpen(int aArgsLength, char *aArgs[]);
-    otError ProcessSend(int aArgsLength, char *aArgs[]);
+    otError ProcessHelp(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessBind(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessClose(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessConnect(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessOpen(uint8_t aArgsLength, char *aArgs[]);
+    otError ProcessSend(uint8_t aArgsLength, char *aArgs[]);
     otError WriteCharToBuffer(otMessage *aMessage, uint16_t aSize);
 
     static void HandleUdpReceive(void *aContext, otMessage *aMessage, const otMessageInfo *aMessageInfo);
diff --git a/src/core/api/diags_api.cpp b/src/core/api/diags_api.cpp
index 66fe3778e..77f8a898e 100644
--- a/src/core/api/diags_api.cpp
+++ b/src/core/api/diags_api.cpp
@@ -49,7 +49,7 @@ void otDiagProcessCmdLine(otInstance *aInstance, const char *aString, char *aOut
     instance.Get<FactoryDiags::Diags>().ProcessLine(aString, aOutput, aOutputMaxLen);
 }
 
-otError otDiagProcessCmd(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError otDiagProcessCmd(otInstance *aInstance, uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     Instance &instance = *static_cast<Instance *>(aInstance);
 
diff --git a/src/core/diags/factory_diags.cpp b/src/core/diags/factory_diags.cpp
index 988f29b4c..00fd28cd9 100644
--- a/src/core/diags/factory_diags.cpp
+++ b/src/core/diags/factory_diags.cpp
@@ -46,7 +46,11 @@
 #include "utils/parse_cmdline.hpp"
 
 OT_TOOL_WEAK
-otError otPlatDiagProcess(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError otPlatDiagProcess(otInstance *aInstance,
+                          uint8_t     aArgsLength,
+                          char *      aArgs[],
+                          char *      aOutput,
+                          size_t      aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -75,7 +79,7 @@ Diags::Diags(Instance &aInstance)
 {
 }
 
-otError Diags::ProcessChannel(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessChannel(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -92,7 +96,7 @@ exit:
     return error;
 }
 
-otError Diags::ProcessPower(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessPower(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -108,7 +112,7 @@ exit:
     return error;
 }
 
-otError Diags::ProcessStart(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessStart(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -120,7 +124,7 @@ otError Diags::ProcessStart(int aArgsLength, char *aArgs[], char *aOutput, size_
     return OT_ERROR_NONE;
 }
 
-otError Diags::ProcessStop(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessStop(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -161,7 +165,7 @@ Diags::Diags(Instance &aInstance)
     otPlatDiagTxPowerSet(mTxPower);
 }
 
-otError Diags::ProcessChannel(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessChannel(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_NONE;
 
@@ -190,7 +194,7 @@ exit:
     return error;
 }
 
-otError Diags::ProcessPower(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessPower(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_NONE;
 
@@ -218,7 +222,7 @@ exit:
     return error;
 }
 
-otError Diags::ProcessRepeat(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessRepeat(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_NONE;
 
@@ -256,7 +260,7 @@ exit:
     return error;
 }
 
-otError Diags::ProcessSend(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessSend(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_NONE;
     long    value;
@@ -280,7 +284,7 @@ exit:
     return error;
 }
 
-otError Diags::ProcessStart(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessStart(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -301,7 +305,7 @@ exit:
     return error;
 }
 
-otError Diags::ProcessStats(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessStats(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_NONE;
 
@@ -329,7 +333,7 @@ exit:
     return error;
 }
 
-otError Diags::ProcessStop(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessStop(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
@@ -369,7 +373,7 @@ void Diags::TransmitPacket(void)
     Get<Radio>().Transmit(*static_cast<Mac::TxFrame *>(mTxPacket));
 }
 
-otError Diags::ProcessRadio(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessRadio(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_INVALID_ARGS;
 
@@ -549,7 +553,7 @@ exit:
     }
 }
 
-otError Diags::ProcessCmd(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError Diags::ProcessCmd(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     otError error = OT_ERROR_NONE;
 
diff --git a/src/core/diags/factory_diags.hpp b/src/core/diags/factory_diags.hpp
index 90209f345..45a1b83e7 100644
--- a/src/core/diags/factory_diags.hpp
+++ b/src/core/diags/factory_diags.hpp
@@ -81,7 +81,7 @@ public:
      * @retval  OT_ERROR_NOT_IMPLEMENTED    The command is not supported.
      *
      */
-    otError ProcessCmd(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessCmd(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
 
     /**
      * This method indicates whether or not the factory diagnostics mode is enabled.
@@ -123,7 +123,7 @@ private:
     struct Command
     {
         const char *mName;
-        otError (Diags::*mCommand)(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+        otError (Diags::*mCommand)(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
     };
 
     struct Stats
@@ -138,14 +138,14 @@ private:
         uint8_t  mLastLqi;
     };
 
-    otError ProcessChannel(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
-    otError ProcessPower(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
-    otError ProcessRadio(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
-    otError ProcessRepeat(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
-    otError ProcessSend(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
-    otError ProcessStart(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
-    otError ProcessStats(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
-    otError ProcessStop(int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessChannel(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessPower(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessRadio(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessRepeat(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessSend(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessStart(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessStats(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
+    otError ProcessStop(uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen);
 
     void TransmitPacket(void);
 
diff --git a/src/posix/platform/radio_spinel.cpp b/src/posix/platform/radio_spinel.cpp
index bda0afe1c..63ce01e64 100644
--- a/src/posix/platform/radio_spinel.cpp
+++ b/src/posix/platform/radio_spinel.cpp
@@ -1889,15 +1889,20 @@ void virtualTimeRadioSpinelProcess(otInstance *aInstance, const struct Event *aE
 #endif // OPENTHREAD_POSIX_VIRTUAL_TIME
 
 #if OPENTHREAD_CONFIG_DIAG_ENABLE
-otError otPlatDiagProcess(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError otPlatDiagProcess(otInstance *aInstance,
+                          uint8_t     aArgsLength,
+                          char *      aArgs[],
+                          char *      aOutput,
+                          size_t      aOutputMaxLen)
 {
     // deliver the platform specific diags commands to radio only ncp.
     OT_UNUSED_VARIABLE(aInstance);
+
     char  cmd[OPENTHREAD_CONFIG_DIAG_CMD_LINE_BUFFER_SIZE] = {'\0'};
     char *cur                                              = cmd;
     char *end                                              = cmd + sizeof(cmd);
 
-    for (int index = 0; index < aArgsLength; index++)
+    for (uint8_t index = 0; index < aArgsLength; index++)
     {
         cur += snprintf(cur, static_cast<size_t>(end - cur), "%s ", aArgs[index]);
     }
diff --git a/tests/fuzz/fuzzer_platform.cpp b/tests/fuzz/fuzzer_platform.cpp
index dcb3a195d..1e29011c2 100644
--- a/tests/fuzz/fuzzer_platform.cpp
+++ b/tests/fuzz/fuzzer_platform.cpp
@@ -194,7 +194,7 @@ bool otDiagIsEnabled(otInstance *aInstance)
     return false;
 }
 
-otError otDiagProcessCmd(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError otDiagProcessCmd(otInstance *aInstance, uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aInstance);
     OT_UNUSED_VARIABLE(aArgsLength);
@@ -512,7 +512,11 @@ otError otPlatUartFlush(void)
     return OT_ERROR_NOT_IMPLEMENTED;
 }
 
-otError otPlatDiagProcess(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+otError otPlatDiagProcess(otInstance *aInstance,
+                          uint8_t     aArgsLength,
+                          char *      aArgs[],
+                          char *      aOutput,
+                          size_t      aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aInstance);
     OT_UNUSED_VARIABLE(aArgsLength);
diff --git a/tests/unit/test_platform.cpp b/tests/unit/test_platform.cpp
index 087abff94..5beb3163a 100644
--- a/tests/unit/test_platform.cpp
+++ b/tests/unit/test_platform.cpp
@@ -425,7 +425,7 @@ exit:
 // Diag
 //
 
-void otPlatDiagProcess(otInstance *aInstance, int aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
+void otPlatDiagProcess(otInstance *aInstance, uint8_t aArgsLength, char *aArgs[], char *aOutput, size_t aOutputMaxLen)
 {
     OT_UNUSED_VARIABLE(aInstance);
     OT_UNUSED_VARIABLE(aArgsLength);