test(tools): add unit tests for error handling functions

* Implement tests for error functions like errRequiredField, errInvalidField, and errEntityNotFound.
* Ensure proper metadata is returned for various error scenarios.
* Validate error handling in CRM, Files, and other tools.
* Introduce tests for parsing stored file IDs and UUIDs.
* Enhance coverage for helper functions related to project resolution and session management.

internal/config/config.go

@@ -31,10 +31,11 @@ type ServerConfig struct {
 }
 
 type MCPConfig struct {
-	Path       string `yaml:"path"`
-	ServerName string `yaml:"server_name"`
-	Version    string `yaml:"version"`
-	Transport  string `yaml:"transport"`
+	Path           string        `yaml:"path"`
+	ServerName     string        `yaml:"server_name"`
+	Version        string        `yaml:"version"`
+	Transport      string        `yaml:"transport"`
+	SessionTimeout time.Duration `yaml:"session_timeout"`
 }
 
 type AuthConfig struct {

internal/config/loader.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 	"time"
 
+	"git.warky.dev/wdevs/amcs/internal/buildinfo"
 	"gopkg.in/yaml.v3"
 )
 
@@ -46,6 +47,7 @@ func ResolvePath(explicitPath string) string {
 }
 
 func defaultConfig() Config {
+	info := buildinfo.Current()
 	return Config{
 		Server: ServerConfig{
 			Host:         "0.0.0.0",
@@ -55,10 +57,11 @@ func defaultConfig() Config {
 			IdleTimeout:  60 * time.Second,
 		},
 		MCP: MCPConfig{
-			Path:       "/mcp",
-			ServerName: "amcs",
-			Version:    "0.1.0",
-			Transport:  "streamable_http",
+			Path:           "/mcp",
+			ServerName:     "amcs",
+			Version:        info.Version,
+			Transport:      "streamable_http",
+			SessionTimeout: 10 * time.Minute,
 		},
 		Auth: AuthConfig{
 			HeaderName: "x-brain-key",

internal/config/loader_test.go

@@ -4,6 +4,7 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+	"time"
 )
 
 func TestResolvePathPrecedence(t *testing.T) {
@@ -37,6 +38,7 @@ server:
   port: 8080
 mcp:
   path: "/mcp"
+  session_timeout: "30m"
 auth:
   keys:
     - id: "test"
@@ -80,6 +82,9 @@ logging:
 	if cfg.Server.Port != 9090 {
 		t.Fatalf("server port = %d, want 9090", cfg.Server.Port)
 	}
+	if cfg.MCP.SessionTimeout != 30*time.Minute {
+		t.Fatalf("mcp session timeout = %v, want 30m", cfg.MCP.SessionTimeout)
+	}
 }
 
 func TestLoadAppliesOllamaEnvOverrides(t *testing.T) {

internal/config/validate.go

@@ -33,6 +33,9 @@ func (c Config) Validate() error {
 	if strings.TrimSpace(c.MCP.Path) == "" {
 		return fmt.Errorf("invalid config: mcp.path is required")
 	}
+	if c.MCP.SessionTimeout <= 0 {
+		return fmt.Errorf("invalid config: mcp.session_timeout must be greater than zero")
+	}
 
 	switch c.AI.Provider {
 	case "litellm", "ollama", "openrouter":

internal/config/validate_test.go

@@ -1,11 +1,14 @@
 package config
 
-import "testing"
+import (
+	"testing"
+	"time"
+)
 
 func validConfig() Config {
 	return Config{
 		Server: ServerConfig{Port: 8080},
-		MCP:    MCPConfig{Path: "/mcp"},
+		MCP:    MCPConfig{Path: "/mcp", SessionTimeout: 10 * time.Minute},
 		Auth: AuthConfig{
 			Keys: []APIKey{{ID: "test", Value: "secret"}},
 		},
@@ -121,3 +124,12 @@ func TestValidateRejectsInvalidMetadataRetryConfig(t *testing.T) {
 		t.Fatal("Validate() error = nil, want error for invalid metadata retry config")
 	}
 }
+
+func TestValidateRejectsInvalidMCPSessionTimeout(t *testing.T) {
+	cfg := validConfig()
+	cfg.MCP.SessionTimeout = 0
+
+	if err := cfg.Validate(); err == nil {
+		t.Fatal("Validate() error = nil, want error for invalid mcp session timeout")
+	}
+}