Refactor duplicate code patterns in logger and DIFC packages (#1791)

Addresses duplicate code analysis findings: ~60 lines of repeated
mutex-locking and logging patterns across logger and DIFC packages.

## Changes

**DIFC Tag Mutation (#1767)** - 21 lines reduced
- Extracted `modifyTag` helper to consolidate mutex-lock + dual-logging
pattern
- Refactored `AddSecrecyTag`, `AddIntegrityTag`, `DropIntegrityTag`

```go
// Before: duplicated 7-line pattern in each method
func (a *AgentLabels) AddSecrecyTag(tag Tag) {
    logAgent.Printf("Agent %s adding secrecy tag: %s", a.AgentID, tag)
    a.mu.Lock()
    defer a.mu.Unlock()
    a.Secrecy.Label.Add(tag)
    log.Printf("[DIFC] Agent %s gained secrecy tag: %s", a.AgentID, tag)
}

// After: unified helper
func (a *AgentLabels) AddSecrecyTag(tag Tag) {
    a.modifyTag("secrecy", "adding", "gained", tag, func() {
        a.Secrecy.Label.Add(tag)
    })
}
```

**Global Logger RWMutex Access (#1768)** - 40 lines reduced
- Created generic `withGlobalLogger` helper with `closableLogger`
constraint
- Refactored 8+ call sites across file_logger, markdown_logger,
jsonl_logger, server_file_logger, tools_logger, rpc_logger

```go
// Before: duplicated RWMutex pattern
globalLoggerMu.RLock()
defer globalLoggerMu.RUnlock()
if globalLogger != nil {
    globalLogger.DoSomething(args...)
}

// After: type-safe generic helper
withGlobalLogger(&globalLoggerMu, &globalLogger, func(logger *Logger) {
    logger.DoSomething(args...)
})
```

**Logger Initialization (#1766)** - No changes required
- Reviewed existing `initLogger` generic - already well-abstracted
- Documented pattern rationale in common.go

## Documentation
Added "Global Logger RWMutex Access Pattern" section to
`internal/logger/common.go` explaining the refactoring approach and
benefits.

> [!WARNING]
>
> <details>
> <summary>Firewall rules blocked me from connecting to one or more
addresses (expand for details)</summary>
>
> #### I tried to connect to the following addresses, but was blocked by
firewall rules:
>
> - `example.com`
> - Triggering command: `/tmp/go-build2039083650/b332/launcher.test
/tmp/go-build2039083650/b332/launcher.test
-test.testlogfile=/tmp/go-build2039083650/b332/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true se stmain.go
ache/go/1.25.7/x64/pkg/tool/linux_amd64/link . --gdwarf2 --64
ache/go/1.25.7/x64/pkg/tool/linuHEAD -I 7410264/b320/difc.test -I
86_64/git --gdwarf-5 --64 -o
Rlvht1SmvPjlx/EgKV67uNxy1s5Sk4WJTJ/FFffmGA1P5hLrHEAD` (dns block)
> - Triggering command: `/tmp/go-build139309952/b332/launcher.test
/tmp/go-build139309952/b332/launcher.test
-test.testlogfile=/tmp/go-build139309952/b332/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true .cfg
/opt/hostedtoolc-goversion 64/pkg/tool/linux_amd64/vet -bool -buildtags
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--abbrev-ref HEAD tnet/tools/git tf &#34;%s%s&#34;, sep, -goversion`
(dns block)
> - Triggering command: `/tmp/go-build311971124/b336/launcher.test
/tmp/go-build311971124/b336/launcher.test
-test.testlogfile=/tmp/go-build311971124/b336/testlog.txt
-test.paniconexit0 -test.timeout=10m0s star��` (dns block)
> - `invalid-host-that-does-not-exist-12345.com`
> - Triggering command: `/tmp/go-build2039083650/b314/config.test
/tmp/go-build2039083650/b314/config.test
-test.testlogfile=/tmp/go-build2039083650/b314/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true 7410264/b253/_pkg_.a
/tmp/go-build1837410264/b068/vet.cfg
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-dumpbase-ext ache/go/1.25.7/xHEAD eU_a��
/opt/hostedtoolcache/go/1.25.7/x64/src/net -I rgo/bin/git
7410264/b253/symbase64 --64 -o /opt/hostedtoolcache/go/1.25.7/xHEAD`
(dns block)
> - Triggering command: `/tmp/go-build139309952/b314/config.test
/tmp/go-build139309952/b314/config.test
-test.testlogfile=/tmp/go-build139309952/b314/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true ;
            s#^/home/REDACTED/.nvm/##;
            \#^[^v]# d;
            \#^versions$# d;
tr /opt/hostedtoolcache/go/1.25.7/xHEAD 64/pkg/tool/linux_amd64/vet
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64/pkg/tool/linux_amd64/vet` (dns block)
> - Triggering command: `/tmp/go-build311971124/b318/config.test
/tmp/go-build311971124/b318/config.test
-test.testlogfile=/tmp/go-build311971124/b318/testlog.txt
-test.paniconexit0 -test.timeout=10m0s .pro��
/opt/hostedtoolc--abbrev-ref /opt/hostedtoolcHEAD
d-dispatcher/off.d/chrony-onoffline /tmp/go-build186dirname git
64/pkg/tool/linux_amd64/compile d-dispatcher/off.d/chrony-onoffline
-nam�� moby -id /usr/bin/runc.original -address /run/containerd/-d
docker-buildx /usr/bin/runc.original` (dns block)
> - `nonexistent.local`
> - Triggering command: `/tmp/go-build2039083650/b332/launcher.test
/tmp/go-build2039083650/b332/launcher.test
-test.testlogfile=/tmp/go-build2039083650/b332/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true se stmain.go
ache/go/1.25.7/x64/pkg/tool/linux_amd64/link . --gdwarf2 --64
ache/go/1.25.7/x64/pkg/tool/linuHEAD -I 7410264/b320/difc.test -I
86_64/git --gdwarf-5 --64 -o
Rlvht1SmvPjlx/EgKV67uNxy1s5Sk4WJTJ/FFffmGA1P5hLrHEAD` (dns block)
> - Triggering command: `/tmp/go-build139309952/b332/launcher.test
/tmp/go-build139309952/b332/launcher.test
-test.testlogfile=/tmp/go-build139309952/b332/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true .cfg
/opt/hostedtoolc-goversion 64/pkg/tool/linux_amd64/vet -bool -buildtags
ache/go/1.25.7/x/tmp/go-build139309952/b319/_pkg_.a
64/pkg/tool/linu-trimpath rev-�� .cfg HEAD ache/go/1.25.7/x-lang=go1.25
--abbrev-ref HEAD tnet/tools/git tf &#34;%s%s&#34;, sep, -goversion`
(dns block)
> - Triggering command: `/tmp/go-build311971124/b336/launcher.test
/tmp/go-build311971124/b336/launcher.test
-test.testlogfile=/tmp/go-build311971124/b336/testlog.txt
-test.paniconexit0 -test.timeout=10m0s star��` (dns block)
> - `slow.example.com`
> - Triggering command: `/tmp/go-build2039083650/b332/launcher.test
/tmp/go-build2039083650/b332/launcher.test
-test.testlogfile=/tmp/go-build2039083650/b332/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true se stmain.go
ache/go/1.25.7/x64/pkg/tool/linux_amd64/link . --gdwarf2 --64
ache/go/1.25.7/x64/pkg/tool/linuHEAD -I 7410264/b320/difc.test -I
86_64/git --gdwarf-5 --64 -o
Rlvht1SmvPjlx/EgKV67uNxy1s5Sk4WJTJ/FFffmGA1P5hLrHEAD` (dns block)
> - Triggering command: `/tmp/go-build139309952/b332/launcher.test
/tmp/go-build139309952/b332/launcher.test
-test.testlogfile=/tmp/go-build139309952/b332/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true .cfg
/opt/hostedtoolc-goversion 64/pkg/tool/linux_amd64/vet -bool -buildtags
ache/go/1.25.7/x/tmp/go-build139309952/b319/_pkg_.a
64/pkg/tool/linu-trimpath rev-�� .cfg HEAD ache/go/1.25.7/x-lang=go1.25
--abbrev-ref HEAD tnet/tools/git tf &#34;%s%s&#34;, sep, -goversion`
(dns block)
> - Triggering command: `/tmp/go-build311971124/b336/launcher.test
/tmp/go-build311971124/b336/launcher.test
-test.testlogfile=/tmp/go-build311971124/b336/testlog.txt
-test.paniconexit0 -test.timeout=10m0s star��` (dns block)
> - `this-host-does-not-exist-12345.com`
> - Triggering command: `/tmp/go-build2039083650/b341/mcp.test
/tmp/go-build2039083650/b341/mcp.test
-test.testlogfile=/tmp/go-build2039083650/b341/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true
/opt/hostedtoolcache/go/1.25.7/x64/src/net -I iptables --gdwarf-5 --64
-o as -I /opt/hostedtoolcache/go/1.25.7/x64/src/net -I
7410264/b248/vet.cfg --gdwarf-5 --64 -o */bin.*$&#34;) { next }
  }
  { printf &#34;%s%s&#34;, sep, HEAD` (dns block)
> - Triggering command: `/tmp/go-build139309952/b341/mcp.test
/tmp/go-build139309952/b341/mcp.test
-test.testlogfile=/tmp/go-build139309952/b341/testlog.txt
-test.paniconexit0 -test.timeout=10m0s -test.v=true -importcfg
4E-sSYy/pwgIjRIG-w ache/go/1.25.7/x-buildmode=exe --abbrev-ref HEAD
nfig/composer/ve--version ache/go/1.25.7/x-extld=gcc` (dns block)
> - Triggering command: `/tmp/go-build311971124/b345/mcp.test
/tmp/go-build311971124/b345/mcp.test
-test.testlogfile=/tmp/go-build311971124/b345/testlog.txt
-test.paniconexit0 -test.timeout=10m0s /usr��
1dedc330cd146d1731f9c903fe295e422bb440808c4a20ae
/var/run/docker/runtime-runc/moby 86_64/git
/run/containerd//opt/hostedtoolcache/go/1.25.7/x64/pkg/tool/linux_amd64/vet
--log-format json 1a2fc60e6817294b-buildtags /usr�� --root
/var/run/docker/-ifaceassert by/7842e098fbefc-nilfunc
/run/containerd/bash 1a2fc60e6817294b/usr/bin/runc json
1a2fc60e6817294b-tests` (dns block)
>
> If you need me to access, download, or install something from one of
these locations, you can either:
>
> - Configure [Actions setup
steps](https://gh.io/copilot/actions-setup-steps) to set up my
environment, which run before the firewall is enabled
> - Add the appropriate URLs or hosts to the custom allowlist in this
repository's [Copilot coding agent
settings](https://github.com/github/gh-aw-mcpg/settings/copilot/coding_agent)
(admins only)
>
> </details>

Author: lpcox

internal/difc/agent.go

@@ -39,31 +39,42 @@ func NewAgentLabelsWithTags(agentID string, secrecyTags []Tag, integrityTags []T
 	}
 }
 
-// AddSecrecyTag adds a secrecy tag to the agent
-func (a *AgentLabels) AddSecrecyTag(tag Tag) {
-	logAgent.Printf("Agent %s adding secrecy tag: %s", a.AgentID, tag)
+// modifyTag is a helper that encapsulates the common pattern for tag modification with locking and logging.
+// It handles the mutex lock, executes the modification action, and logs the operation.
+//
+// Parameters:
+//   - labelType: The type of label being modified ("secrecy" or "integrity")
+//   - action: The verb describing the action ("adding", "dropping", etc.)
+//   - pastTense: The past tense verb for the operational log ("gained", "dropped", etc.)
+//   - tag: The tag being modified
+//   - fn: The function that performs the actual label modification
+func (a *AgentLabels) modifyTag(labelType, action, pastTense string, tag Tag, fn func()) {
+	logAgent.Printf("Agent %s %s %s tag: %s", a.AgentID, action, labelType, tag)
 	a.mu.Lock()
 	defer a.mu.Unlock()
-	a.Secrecy.Label.Add(tag)
-	log.Printf("[DIFC] Agent %s gained secrecy tag: %s", a.AgentID, tag)
+	fn()
+	log.Printf("[DIFC] Agent %s %s %s tag: %s", a.AgentID, pastTense, labelType, tag)
+}
+
+// AddSecrecyTag adds a secrecy tag to the agent
+func (a *AgentLabels) AddSecrecyTag(tag Tag) {
+	a.modifyTag("secrecy", "adding", "gained", tag, func() {
+		a.Secrecy.Label.Add(tag)
+	})
 }
 
 // AddIntegrityTag adds an integrity tag to the agent
 func (a *AgentLabels) AddIntegrityTag(tag Tag) {
-	logAgent.Printf("Agent %s adding integrity tag: %s", a.AgentID, tag)
-	a.mu.Lock()
-	defer a.mu.Unlock()
-	a.Integrity.Label.Add(tag)
-	log.Printf("[DIFC] Agent %s gained integrity tag: %s", a.AgentID, tag)
+	a.modifyTag("integrity", "adding", "gained", tag, func() {
+		a.Integrity.Label.Add(tag)
+	})
 }
 
 // DropIntegrityTag removes an integrity tag from the agent
 func (a *AgentLabels) DropIntegrityTag(tag Tag) {
-	logAgent.Printf("Agent %s dropping integrity tag: %s", a.AgentID, tag)
-	a.mu.Lock()
-	defer a.mu.Unlock()
-	a.Integrity.Label.Remove(tag)
-	log.Printf("[DIFC] Agent %s dropped integrity tag: %s", a.AgentID, tag)
+	a.modifyTag("integrity", "dropping", "dropped", tag, func() {
+		a.Integrity.Label.Remove(tag)
+	})
 }
 
 // DropIntegrityTags removes multiple integrity tags from the agent

internal/logger/common.go

@@ -224,6 +224,44 @@ import (
 //  1. Add a new entry to the logFuncs map in file_logger.go.
 //  2. Add a new LogTrace wrapper to each of the three files above.
 
+// Global Logger RWMutex Access Pattern
+//
+// All access to global logger instances uses the withGlobalLogger helper function
+// (defined in global_helpers.go) to eliminate duplicated RWMutex locking patterns.
+//
+// Before refactoring (duplicated pattern):
+//
+//	globalLoggerMu.RLock()
+//	defer globalLoggerMu.RUnlock()
+//
+//	if globalLogger != nil {
+//	    globalLogger.DoSomething(args...)
+//	}
+//
+// After refactoring (unified pattern):
+//
+//	withGlobalLogger(&globalLoggerMu, &globalLogger, func(logger *Logger) {
+//	    logger.DoSomething(args...)
+//	})
+//
+// The withGlobalLogger helper is used in:
+//   - file_logger.go: logWithLevel (for FileLogger)
+//   - markdown_logger.go: logWithMarkdown (for MarkdownLogger)
+//   - jsonl_logger.go: LogRPCMessageJSONLWithTags (for JSONLLogger)
+//   - server_file_logger.go: logWithLevelAndServer (for ServerFileLogger)
+//   - tools_logger.go: LogToolsForServer (for ToolsLogger)
+//   - rpc_logger.go: logRPCMessageToAll and LogRPCMessage (for MarkdownLogger)
+//
+// Benefits:
+//   - Eliminates ~40 lines of duplicated mutex code
+//   - Provides a single point of control for the locking pattern
+//   - Type-safe through generics (enforces closableLogger constraint)
+//   - Easier to modify the locking strategy globally (e.g., add timeouts)
+//
+// When adding a new logger access point:
+//  1. Use withGlobalLogger instead of manual RLock/RUnlock
+//  2. Pass the appropriate mutex, logger pointer, and callback function
+
 // It syncs buffered data before closing and handles errors appropriately.
 // The mutex should already be held by the caller.
 //

internal/logger/file_logger.go

@@ -111,15 +111,13 @@ func (fl *FileLogger) GetWriter() io.Writer {
 // Global logging functions that use the global file logger
 
 // logWithLevel is a helper that reduces code duplication for logging at different levels.
-// It handles mutex locking and nil-checking in a single place, eliminating the need
-// for repeated mutex lock/unlock patterns across LogInfo, LogWarn, LogError, and LogDebug.
+// It uses the withGlobalLogger helper from global_helpers.go to handle mutex locking and
+// nil-checking, eliminating the need for repeated RWMutex lock/unlock patterns across
+// LogInfo, LogWarn, LogError, and LogDebug.
 func logWithLevel(level LogLevel, category, format string, args ...interface{}) {
-	globalLoggerMu.RLock()
-	defer globalLoggerMu.RUnlock()
-
-	if globalFileLogger != nil {
-		globalFileLogger.Log(level, category, format, args...)
-	}
+	withGlobalLogger(&globalLoggerMu, &globalFileLogger, func(logger *FileLogger) {
+		logger.Log(level, category, format, args...)
+	})
 }
 
 // LogInfo logs an informational message

internal/logger/global_helpers.go

@@ -23,6 +23,39 @@ type closableLogger interface {
 	Close() error
 }
 
+// withGlobalLogger is a generic helper that encapsulates the common pattern for
+// accessing a global logger with proper RWMutex locking and nil-checking.
+//
+// This eliminates the repeated pattern of:
+//
+//	globalLoggerMu.RLock()
+//	defer globalLoggerMu.RUnlock()
+//	if globalLogger != nil {
+//	    globalLogger.DoSomething(args...)
+//	}
+//
+// Type parameters:
+//   - T: Any pointer type that satisfies closableLogger constraint
+//
+// Parameters:
+//   - mu: RWMutex to protect access to the global logger
+//   - logger: Pointer to the global logger instance
+//   - fn: Function to execute with the logger if it's not nil
+//
+// Example usage:
+//
+//	withGlobalLogger(&globalLoggerMu, &globalFileLogger, func(l *FileLogger) {
+//	    l.Log(level, category, format, args...)
+//	})
+func withGlobalLogger[T closableLogger](mu *sync.RWMutex, logger *T, fn func(T)) {
+	mu.RLock()
+	defer mu.RUnlock()
+
+	if *logger != nil {
+		fn(*logger)
+	}
+}
+
 // initGlobalLogger is a generic helper that encapsulates the common pattern for
 // initializing a global logger with proper mutex handling.
 //

internal/logger/jsonl_logger.go

@@ -108,34 +108,30 @@ func LogRPCMessageJSONL(direction RPCMessageDirection, messageType RPCMessageTyp
 }
 
 // LogRPCMessageJSONLWithTags logs an RPC message to the global JSONL logger with optional agent tag snapshots.
+// It uses the withGlobalLogger helper from global_helpers.go to handle mutex locking and nil-checking.
 func LogRPCMessageJSONLWithTags(direction RPCMessageDirection, messageType RPCMessageType, serverID, method string, payloadBytes []byte, err error, agentSecrecy, agentIntegrity []string) {
-	globalJSONLMu.RLock()
-	defer globalJSONLMu.RUnlock()
-
-	if globalJSONLLogger == nil {
-		return
-	}
-
-	entry := &JSONLRPCMessage{
-		Timestamp: time.Now().UTC().Format(time.RFC3339Nano),
-		Direction: string(direction),
-		Type:      string(messageType),
-		ServerID:  serverID,
-		Method:    method,
-		Payload:   sanitize.SanitizeJSON(payloadBytes),
-	}
-
-	if len(agentSecrecy) > 0 {
-		entry.AgentSecrecy = append([]string(nil), agentSecrecy...)
-	}
-	if len(agentIntegrity) > 0 {
-		entry.AgentIntegrity = append([]string(nil), agentIntegrity...)
-	}
-
-	if err != nil {
-		entry.Error = err.Error()
-	}
-
-	// Best effort logging - don't fail if JSONL logging fails
-	_ = globalJSONLLogger.LogMessage(entry)
+	withGlobalLogger(&globalJSONLMu, &globalJSONLLogger, func(logger *JSONLLogger) {
+		entry := &JSONLRPCMessage{
+			Timestamp: time.Now().UTC().Format(time.RFC3339Nano),
+			Direction: string(direction),
+			Type:      string(messageType),
+			ServerID:  serverID,
+			Method:    method,
+			Payload:   sanitize.SanitizeJSON(payloadBytes),
+		}
+
+		if len(agentSecrecy) > 0 {
+			entry.AgentSecrecy = append([]string(nil), agentSecrecy...)
+		}
+		if len(agentIntegrity) > 0 {
+			entry.AgentIntegrity = append([]string(nil), agentIntegrity...)
+		}
+
+		if err != nil {
+			entry.Error = err.Error()
+		}
+
+		// Best effort logging - don't fail if JSONL logging fails
+		_ = logger.LogMessage(entry)
+	})
 }

internal/logger/markdown_logger.go

@@ -169,18 +169,17 @@ func (ml *MarkdownLogger) Log(level LogLevel, category, format string, args ...i
 
 // Global logging functions that also write to markdown logger
 
-// logWithMarkdown is a helper that logs to both regular and markdown loggers
+// logWithMarkdown is a helper that logs to both regular and markdown loggers.
+// It uses the withGlobalLogger helper from global_helpers.go to handle mutex locking
+// and nil-checking for the markdown logger access.
 func logWithMarkdown(level LogLevel, regularLogFunc func(string, string, ...interface{}), category, format string, args ...interface{}) {
 	// Log to regular logger
 	regularLogFunc(category, format, args...)
 
-	// Log to markdown logger
-	globalMarkdownMu.RLock()
-	defer globalMarkdownMu.RUnlock()
-
-	if globalMarkdownLogger != nil {
-		globalMarkdownLogger.Log(level, category, format, args...)
-	}
+	// Log to markdown logger using withGlobalLogger helper
+	withGlobalLogger(&globalMarkdownMu, &globalMarkdownLogger, func(logger *MarkdownLogger) {
+		logger.Log(level, category, format, args...)
+	})
 }
 
 // logWithMarkdownLevel is a helper that reduces code duplication for markdown logging at different levels.

internal/logger/rpc_logger.go

@@ -59,7 +59,8 @@ type RPCMessageInfo struct {
 	Error       string              // Error message if any (for responses)
 }
 
-// logRPCMessageToAll is a helper that logs RPC messages to text, markdown, and JSONL logs
+// logRPCMessageToAll is a helper that logs RPC messages to text, markdown, and JSONL logs.
+// It uses the withGlobalLogger helper from global_helpers.go to handle mutex locking and nil-checking.
 func logRPCMessageToAll(direction RPCMessageDirection, messageType RPCMessageType, serverID, method string, payload []byte, err error, agentSecrecy, agentIntegrity []string) {
 	// Create info for text log (with larger payload preview)
 	infoText := &RPCMessageInfo{
@@ -92,13 +93,10 @@ func logRPCMessageToAll(direction RPCMessageDirection, messageType RPCMessageTyp
 		infoMarkdown.Error = err.Error()
 	}
 
-	// Log to markdown file
-	globalMarkdownMu.RLock()
-	defer globalMarkdownMu.RUnlock()
-
-	if globalMarkdownLogger != nil {
-		globalMarkdownLogger.Log(LogLevelDebug, "rpc", "%s", formatRPCMessageMarkdown(infoMarkdown))
-	}
+	// Log to markdown file using withGlobalLogger helper
+	withGlobalLogger(&globalMarkdownMu, &globalMarkdownLogger, func(logger *MarkdownLogger) {
+		logger.Log(LogLevelDebug, "rpc", "%s", formatRPCMessageMarkdown(infoMarkdown))
+	})
 
 	// Log to JSONL file (full payload, sanitized)
 	LogRPCMessageJSONLWithTags(direction, messageType, serverID, method, payload, err, agentSecrecy, agentIntegrity)
@@ -124,16 +122,14 @@ func LogRPCResponseWithAgentSnapshot(direction RPCMessageDirection, serverID str
 	logRPCMessageToAll(direction, RPCMessageResponse, serverID, "", payload, err, agentSecrecy, agentIntegrity)
 }
 
-// LogRPCMessage logs a generic RPC message with custom info
+// LogRPCMessage logs a generic RPC message with custom info.
+// It uses the withGlobalLogger helper from global_helpers.go to handle mutex locking and nil-checking.
 func LogRPCMessage(info *RPCMessageInfo) {
 	// Log to text file
 	LogDebug("rpc", "%s", formatRPCMessage(info))
 
-	// Log to markdown file
-	globalMarkdownMu.RLock()
-	defer globalMarkdownMu.RUnlock()
-
-	if globalMarkdownLogger != nil {
-		globalMarkdownLogger.Log(LogLevelDebug, "rpc", "%s", formatRPCMessageMarkdown(info))
-	}
+	// Log to markdown file using withGlobalLogger helper
+	withGlobalLogger(&globalMarkdownMu, &globalMarkdownLogger, func(logger *MarkdownLogger) {
+		logger.Log(LogLevelDebug, "rpc", "%s", formatRPCMessageMarkdown(info))
+	})
 }

internal/logger/server_file_logger.go

@@ -159,16 +159,13 @@ func (sfl *ServerFileLogger) Close() error {
 // Global logging functions that use the global server file logger
 
 // logWithLevelAndServer is a helper that reduces code duplication for per-server logging at different levels.
-// It handles mutex locking, nil-checking, and dual logging (server-specific + unified) in a single place,
+// It uses the withGlobalLogger helper from global_helpers.go to handle mutex locking and nil-checking,
 // eliminating repeated patterns across LogInfoWithServer, LogWarnWithServer, LogErrorWithServer, and LogDebugWithServer.
 // It uses the logFuncs map (file_logger.go) for the unified log dispatch, avoiding a repeated switch-on-level block.
 func logWithLevelAndServer(serverID string, level LogLevel, category, format string, args ...interface{}) {
-	globalServerLoggerMu.RLock()
-	defer globalServerLoggerMu.RUnlock()
-
-	if globalServerFileLogger != nil {
-		globalServerFileLogger.Log(serverID, level, category, format, args...)
-	}
+	withGlobalLogger(&globalServerLoggerMu, &globalServerFileLogger, func(logger *ServerFileLogger) {
+		logger.Log(serverID, level, category, format, args...)
+	})
 
 	// Also log to the main log file for unified view
 	// Use logFuncs to dispatch to the appropriate level function

internal/logger/tools_logger.go

@@ -131,17 +131,15 @@ func (tl *ToolsLogger) Close() error {
 
 // Global logging function that uses the global tools logger
 
-// LogToolsForServer logs the tools for a specific server
+// LogToolsForServer logs the tools for a specific server.
+// It uses the withGlobalLogger helper from global_helpers.go to handle mutex locking and nil-checking.
 func LogToolsForServer(serverID string, tools []ToolInfo) {
-	globalToolsMu.RLock()
-	defer globalToolsMu.RUnlock()
-
-	if globalToolsLogger != nil {
-		if err := globalToolsLogger.LogTools(serverID, tools); err != nil {
+	withGlobalLogger(&globalToolsMu, &globalToolsLogger, func(logger *ToolsLogger) {
+		if err := logger.LogTools(serverID, tools); err != nil {
 			// Log errors using the standard logger to avoid recursion
 			log.Printf("WARNING: Failed to log tools for server %s: %v", serverID, err)
 		}
-	}
+	})
 }
 
 // CloseToolsLogger closes the global tools logger