Refactor: Remove authentication wrapper, clarify version management, document error types

go.mod

@@ -14,3 +14,16 @@ require (
 	github.com/santhosh-tekuri/jsonschema/v5 v5.3.1
 	github.com/stretchr/testify v1.11.1
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/google/jsonschema-go v0.3.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/itchyny/timefmt-go v0.1.7 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
+	golang.org/x/oauth2 v0.30.0 // indirect
+	golang.org/x/sys v0.39.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -1,29 +1,18 @@
-cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
 github.com/BurntSushi/toml v1.6.0 h1:dRaEfpa2VI55EwlIW72hMRHdWouJeRF7TPYhI+AUQjk=
 github.com/BurntSushi/toml v1.6.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
-github.com/clipperhouse/stringish v0.1.1/go.mod h1:v/WhFtE1q0ovMta2+m+UbpZ+2/HEXNWYXQgCt4hdOzA=
-github.com/clipperhouse/uax29/v2 v2.2.0/go.mod h1:EFJ2TJMRUaplDxHKj1qAEhCtQPW2tJSwu5BF98AuoVM=
-github.com/clipperhouse/uax29/v2 v2.3.0/go.mod h1:Wn1g7MK6OoeDT0vL+Q0SQLDz/KpfsVRgg6W7ihQeh4g=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
-github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/jsonschema-go v0.3.0 h1:6AH2TxVNtk3IlvkkhjrtbUc4S8AvO0Xii0DxIygDg+Q=
 github.com/google/jsonschema-go v0.3.0/go.mod h1:r5quNTdLOYEz95Ru18zA0ydNbBuYoo9tgaYcxEYhJVE=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
-github.com/itchyny/go-yaml v0.0.0-20251001235044-fca9a0999f15/go.mod h1:Tmbz8uw5I/I6NvVpEGuhzlElCGS5hPoXJkt7l+ul6LE=
 github.com/itchyny/gojq v0.12.18 h1:gFGHyt/MLbG9n6dqnvlliiya2TaMMh6FFaR2b1H6Drc=
 github.com/itchyny/gojq v0.12.18/go.mod h1:4hPoZ/3lN9fDL1D+aK7DY1f39XZpY9+1Xpjz8atrEkg=
 github.com/itchyny/timefmt-go v0.1.7 h1:xyftit9Tbw+Dc/huSSPJaEmX1TVL8lw5vxjJLK4GMMA=
 github.com/itchyny/timefmt-go v0.1.7/go.mod h1:5E46Q+zj7vbTgWY8o5YkMeYb4I6GeWLFnetPy5oBrAI=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
-github.com/mattn/go-runewidth v0.0.19/go.mod h1:XBkDxAl56ILZc9knddidhrOlY5R/pDhgLpndooCuJAs=
 github.com/modelcontextprotocol/go-sdk v1.1.0 h1:Qjayg53dnKC4UZ+792W21e4BpwEZBzwgRW6LrjLWSwA=
 github.com/modelcontextprotocol/go-sdk v1.1.0/go.mod h1:6fM3LCm3yV7pAs8isnKLn07oKtB0MP9LHd3DfAcKw10=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -35,103 +24,20 @@ github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
 github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
 github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
 github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/yosida95/uritemplate/v3 v3.0.2 h1:Ed3Oyj9yrmi9087+NczuL5BwkIc4wvTb5zIM+UJPGz4=
 github.com/yosida95/uritemplate/v3 v3.0.2/go.mod h1:ILOh0sOhIJR3+L/8afwt/kE++YT040gmv5BQTMR2HP4=
-github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
-golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
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 golang.org/x/oauth2 v0.30.0 h1:dnDm7JmhM45NNpd8FDDeLhK6FwqbOf4MLCM9zb1BOHI=
 golang.org/x/oauth2 v0.30.0/go.mod h1:B++QgG3ZKulg6sRPGD/mqlHQs5rB3Ml9erfeDY7xKlU=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/cmd/root.go

@@ -471,5 +471,5 @@ func Execute() {
 func SetVersion(v string) {
 	version = v
 	rootCmd.Version = v
-	config.SetVersion(v)
+	config.SetGatewayVersion(v)
 }

internal/config/rules/rules.go

@@ -11,7 +11,14 @@ const (
 	SchemaURL     = "https://raw.githubusercontent.com/githubnext/gh-aw/main/docs/public/schemas/mcp-gateway-config.schema.json"
 )
 
-// ValidationError represents a configuration validation error with context
+// ValidationError represents a configuration validation error with context.
+// It provides detailed information about what went wrong during configuration
+// validation, including the field that failed, a human-readable message,
+// the JSON path to the error location, and a suggestion for how to fix it.
+//
+// This error type implements the error interface and formats itself with
+// helpful context when Error() is called, including the JSON path and
+// suggestion if available.
 type ValidationError struct {
 	Field      string
 	Message    string

internal/config/validation_env.go

@@ -23,7 +23,25 @@ var RequiredEnvVars = []string{
 // Container IDs are 64 character hex strings, but short form (12 chars) is also valid
 var containerIDPattern = regexp.MustCompile(`^[a-f0-9]{12,64}$`)
 
-// EnvValidationResult holds the result of environment validation
+// EnvValidationResult holds the result of environment validation.
+// It captures various aspects of the execution environment including
+// containerization status, Docker accessibility, and validation errors/warnings.
+//
+// This type implements the error interface through its Error() method,
+// which returns a formatted error message containing all validation failures.
+// Use IsValid() to check if all critical validations passed before attempting
+// to start the gateway.
+//
+// Fields:
+//   - IsContainerized: Whether the gateway is running inside a Docker container
+//   - ContainerID: The Docker container ID if containerized
+//   - DockerAccessible: Whether the Docker daemon is accessible
+//   - MissingEnvVars: List of required environment variables that are not set
+//   - PortMapped: Whether the gateway port is mapped to the host (containerized mode)
+//   - StdinInteractive: Whether stdin is interactive (containerized mode)
+//   - LogDirMounted: Whether the log directory is mounted (containerized mode)
+//   - ValidationErrors: Critical errors that prevent the gateway from starting
+//   - ValidationWarnings: Non-critical issues that should be addressed
 type EnvValidationResult struct {
 	IsContainerized    bool
 	ContainerID        string

internal/config/validation_schema.go

@@ -24,8 +24,8 @@ var (
 	gatewayVersion = "dev"
 )
 
-// SetVersion sets the gateway version for error reporting
-func SetVersion(version string) {
+// SetGatewayVersion sets the gateway version for error reporting
+func SetGatewayVersion(version string) {
 	if version != "" {
 		gatewayVersion = version
 	}

internal/config/validation_schema_test.go

@@ -528,7 +528,7 @@ func TestValidateStringPatterns(t *testing.T) {
 // TestEnhancedErrorMessages verifies that validation errors include version and detailed context
 func TestEnhancedErrorMessages(t *testing.T) {
 	// Set a test version
-	SetVersion("v1.2.3-test")
+	SetGatewayVersion("v1.2.3-test")
 
 	tests := []struct {
 		name          string

internal/difc/labels.go

@@ -255,7 +255,23 @@ const (
 	IntegrityViolation ViolationType = "integrity"
 )
 
-// ViolationError provides detailed information about a DIFC violation
+// ViolationError provides detailed information about a DIFC (Decentralized Information Flow Control) violation.
+// It describes what kind of violation occurred, which resource was involved, and what needs to be
+// done to resolve the violation.
+//
+// This error type implements the error interface and provides human-readable error messages
+// that explain the violation and suggest remediation steps. DIFC violations occur when:
+//   - Secrecy: An agent tries to access a resource but has secrecy tags that would leak sensitive information
+//   - Integrity: An agent tries to write to a resource but lacks the required integrity tags to ensure trustworthiness
+//
+// Fields:
+//   - Type: The kind of violation (SecrecyViolation or IntegrityViolation)
+//   - Resource: Human-readable description of the resource being accessed
+//   - IsWrite: true for write operations, false for read operations
+//   - MissingTags: Tags the agent needs but doesn't have (for integrity violations)
+//   - ExtraTags: Tags the agent has but shouldn't (for secrecy violations)
+//   - AgentTags: Complete set of the agent's tags (for context)
+//   - ResourceTags: Complete set of the resource's tags (for context)
 type ViolationError struct {
 	Type         ViolationType
 	Resource     string // Resource description

internal/guard/context.go

@@ -1,20 +1,18 @@
 // Package guard provides security context management and guard registry for the MCP Gateway.
 //
 // This package is responsible for managing security labels (DIFC - Decentralized Information
-// Flow Control) and extracting agent identifiers from request contexts.
+// Flow Control) and storing/retrieving agent identifiers in request contexts.
 //
 // Relationship with internal/auth:
 //
 // - internal/auth: Primary authentication logic (header parsing, validation)
 // - internal/guard: Security context management (agent ID tracking, guard registry)
 //
-// For new code, prefer using internal/auth for authentication-related operations.
-// The guard package's ExtractAgentIDFromAuthHeader() is deprecated and delegates
-// to auth.ExtractAgentID() for centralized authentication logic.
+// For authentication-related operations, always use the internal/auth package directly.
 //
 // Example:
 //
-//	// Store agent ID in context (use auth.ExtractAgentID for parsing)
+//	// Extract agent ID from auth header and store in context
 //	agentID := auth.ExtractAgentID(authHeader)
 //	ctx = guard.SetAgentIDInContext(ctx, agentID)
 //
@@ -25,7 +23,6 @@ package guard
 import (
 	"context"
 
-	"github.com/githubnext/gh-aw-mcpg/internal/auth"
 	"github.com/githubnext/gh-aw-mcpg/internal/logger"
 )
 
@@ -59,19 +56,6 @@ func SetAgentIDInContext(ctx context.Context, agentID string) context.Context {
 	return context.WithValue(ctx, AgentIDContextKey, agentID)
 }
 
-// ExtractAgentIDFromAuthHeader extracts agent ID from Authorization header.
-//
-// Deprecated: Use auth.ExtractAgentID() instead for centralized authentication parsing.
-// This function is maintained for backward compatibility but delegates to the auth package.
-//
-// For MCP spec 7.1 compliant parsing with full error handling, use auth.ParseAuthHeader().
-func ExtractAgentIDFromAuthHeader(authHeader string) string {
-	log.Print("Extracting agent ID from auth header (deprecated path)")
-	agentID := auth.ExtractAgentID(authHeader)
-	log.Printf("Extracted agent ID: %s", agentID)
-	return agentID
-}
-
 // GetRequestStateFromContext retrieves guard request state from context
 func GetRequestStateFromContext(ctx context.Context) RequestState {
 	if state, ok := ctx.Value(RequestStateContextKey).(RequestState); ok {