feat(codex): add support for Codex CLI agent

CLAUDE.md

@@ -32,14 +32,15 @@ make clean
 
 ## Architecture
 
-AgentX is a CLI tool for managing MCP servers, skills, and plugins across multiple AI coding agents (Claude Code, Cursor, Gemini CLI, OpenCode).
+AgentX is a CLI tool for managing MCP servers, skills, and plugins across multiple AI coding agents (Claude Code, Codex, Cursor, Gemini CLI, OpenCode).
 
 ### Core Layers
 
 **CLI Layer** (`cmd/`): Cobra-based commands. `root.go` launches the TUI when run without arguments, or delegates to subcommands (`install`, `check`, `list`, `remove`, `skills`, `plugins`).
 
-**Agent Abstraction** (`internal/agent/`): The `Agent` interface defines operations for all supported agents. Each agent (Claude, Cursor, Gemini, OpenCode) implements this interface with its own config file location and format:
+**Agent Abstraction** (`internal/agent/`): The `Agent` interface defines operations for all supported agents. Each agent (Claude, Codex, Cursor, Gemini, OpenCode) implements this interface with its own config file location and format:
 - Claude Code: `~/.claude.json`
+- Codex: `~/.codex/config.toml`
 - Cursor: `~/.cursor/mcp.json`
 - Gemini CLI: `~/.gemini/settings.json`
 - OpenCode: `~/.opencode/config.json`

README.md

@@ -7,6 +7,7 @@ AgentX stands for Agent eXtension: A unified CLI tool for managing **MCP (Model
 AgentX simplifies the installation, management, and monitoring of MCP servers and skills across popular AI coding tools:
 
 - **Claude Code**
+- **Codex**
 - **Cursor**
 - **Gemini CLI**
 - **OpenCode**
@@ -23,9 +24,9 @@ It provides both a command-line interface and an interactive terminal UI (TUI) f
   - **Playwright** - Browser automation capabilities
   - **Context7** - Library documentation access
 
-### Claude Code Skills Management
+### Claude Code & Codex Skills Management
 - Install skills from local paths or Git repositories
-- Support for skill directories (with `SKILL.md`) and command files (`.md`)
+- Support for skill directories (with `SKILL.md`); Claude Code also supports command files (`.md`)
 - Install from GitHub URLs with tree fragments
 - Personal and project scope management
 - Skills health checking and validation
@@ -105,24 +106,34 @@ The tool responds to: `agentx`, `agents`, or `ax`
 | Agent | Config Path |
 |-------|-------------|
 | Claude Code | `~/.claude.json` |
+| Codex | `~/.codex/config.toml` |
 | Cursor | `~/.cursor/mcp.json` |
 | Gemini CLI | `~/.gemini/settings.json` |
 | OpenCode | `~/.opencode/config.json` |
 
 ### Skills Storage
 
+Claude Code:
+
 | Scope | Skills Directory | Commands Directory |
 |-------|------------------|-------------------|
 | Personal | `~/.claude/skills/` | `~/.claude/commands/` |
 | Project | `.claude/skills/` | `.claude/commands/` |
 
+Codex:
+
+| Scope | Skills Directory |
+|-------|------------------|
+| Personal | `$CODEX_HOME/skills/` (default `~/.codex/skills/`) |
+| Project | `.codex/skills/` |
+
 ## Project Structure
 
 ```
 agentx/
 ├── cmd/                    # CLI commands
 ├── internal/
-│   ├── agent/             # Agent implementations (Claude, Cursor, Gemini, OpenCode)
+│   ├── agent/             # Agent implementations (Claude, Codex, Cursor, Gemini, OpenCode)
 │   ├── config/            # Configuration management
 │   ├── skills/            # Skills management
 │   ├── mcp/               # MCP-specific logic

cmd/install.go

@@ -3,8 +3,8 @@ package cmd
 import (
 	"fmt"
 
-	"github.com/spf13/cobra"
 	"github.com/agentsdance/agentx/internal/agent"
+	"github.com/spf13/cobra"
 )
 
 var agentFlag string
@@ -54,5 +54,5 @@ var installCmd = &cobra.Command{
 }
 
 func init() {
-	installCmd.Flags().StringVarP(&agentFlag, "agent", "a", "", "Target agent (claude, gemini, opencode)")
+	installCmd.Flags().StringVarP(&agentFlag, "agent", "a", "", "Target agent (claude, codex, cursor, gemini, opencode)")
 }

cmd/root.go

@@ -4,17 +4,17 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/spf13/cobra"
 	"github.com/agentsdance/agentx/internal/version"
 	"github.com/agentsdance/agentx/ui"
+	"github.com/spf13/cobra"
 )
 
 var rootCmd = &cobra.Command{
 	Use:     "agentx",
 	Aliases: []string{"agents", "ax"},
 	Short:   "Unified MCP Servers & Agent Skills Manager for AI coding agents",
 	Long: `agentx is a CLI tool for managing MCP servers and skills across AI coding agents
-(Claude Code, Cursor, Gemini cli, opencode).
+(Claude Code, Codex, Cursor, Gemini cli, opencode).
 
 Run without arguments to launch the TUI interface.
 

cmd/skills.go

@@ -3,33 +3,45 @@ package cmd
 import (
 	"fmt"
 	"os"
+	"strings"
 	"text/tabwriter"
 
-	"github.com/spf13/cobra"
 	"github.com/agentsdance/agentx/internal/skills"
+	"github.com/spf13/cobra"
 )
 
 var skillsScope string
+var skillsAgent string
 
 var skillsCmd = &cobra.Command{
 	Use:   "skills",
-	Short: "Manage Claude Code skills",
-	Long: `Manage Claude Code skills and slash commands.
+	Short: "Manage Claude Code and Codex skills",
+	Long: `Manage Claude Code and Codex skills and slash commands.
+
+Use --agent to switch between agents (default: Claude Code). Codex does not
+support command files.
 
 Skills are stored in:
   Personal: ~/.claude/skills/ and ~/.claude/commands/
-  Project:  .claude/skills/ and .claude/commands/`,
+  Project:  .claude/skills/ and .claude/commands/
+
+Codex skills are stored in:
+  Personal: $CODEX_HOME/skills/ (default ~/.codex/skills/)
+  Project:  .codex/skills/`,
 }
 
 var skillsListCmd = &cobra.Command{
 	Use:   "list",
 	Short: "List installed skills",
 	Long:  `List all installed skills and commands.`,
 	Run: func(cmd *cobra.Command, args []string) {
-		mgr := skills.NewSkillManager()
+		mgr, err := resolveSkillsManager()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			os.Exit(1)
+		}
 
 		var skillList []skills.Skill
-		var err error
 
 		if skillsScope != "" {
 			scope := skills.SkillScope(skillsScope)
@@ -90,7 +102,11 @@ The source can be:
 			scope = skills.ScopeProject
 		}
 
-		mgr := skills.NewSkillManager()
+		mgr, err := resolveSkillsManager()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			os.Exit(1)
+		}
 		skill, err := mgr.Install(source, scope)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
@@ -117,7 +133,11 @@ var skillsRemoveCmd = &cobra.Command{
 			scope = skills.ScopeProject
 		}
 
-		mgr := skills.NewSkillManager()
+		mgr, err := resolveSkillsManager()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			os.Exit(1)
+		}
 		if err := mgr.Remove(name, scope); err != nil {
 			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 			os.Exit(1)
@@ -132,7 +152,11 @@ var skillsCheckCmd = &cobra.Command{
 	Short: "Check skills installation status",
 	Long:  `Verify that all installed skills are valid and properly configured.`,
 	Run: func(cmd *cobra.Command, args []string) {
-		mgr := skills.NewSkillManager()
+		mgr, err := resolveSkillsManager()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			os.Exit(1)
+		}
 		statuses, err := mgr.Check()
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
@@ -186,9 +210,30 @@ var skillsCheckCmd = &cobra.Command{
 func init() {
 	skillsCmd.PersistentFlags().StringVarP(&skillsScope, "scope", "s", "",
 		"Scope for the operation (personal, project)")
+	skillsCmd.PersistentFlags().StringVarP(&skillsAgent, "agent", "a", "claude",
+		"Target agent for skills (claude, codex)")
 
 	skillsCmd.AddCommand(skillsListCmd)
 	skillsCmd.AddCommand(skillsInstallCmd)
 	skillsCmd.AddCommand(skillsRemoveCmd)
 	skillsCmd.AddCommand(skillsCheckCmd)
 }
+
+func resolveSkillsManager() (*skills.DefaultSkillManager, error) {
+	switch normalizeSkillsAgent(skillsAgent) {
+	case "", "claude", "claudecode":
+		return skills.NewSkillManager(), nil
+	case "codex":
+		return skills.NewCodexSkillManager(), nil
+	default:
+		return nil, fmt.Errorf("unknown agent: %s (use 'claude' or 'codex')", skillsAgent)
+	}
+}
+
+func normalizeSkillsAgent(name string) string {
+	normalized := strings.ToLower(strings.TrimSpace(name))
+	normalized = strings.ReplaceAll(normalized, "-", "")
+	normalized = strings.ReplaceAll(normalized, "_", "")
+	normalized = strings.ReplaceAll(normalized, " ", "")
+	return normalized
+}

go.mod

@@ -5,6 +5,7 @@ go 1.25.1
 require (
 	github.com/charmbracelet/bubbletea v1.3.10
 	github.com/charmbracelet/lipgloss v1.1.0
+	github.com/pelletier/go-toml/v2 v2.2.4
 	github.com/spf13/cobra v1.10.2
 	gopkg.in/yaml.v3 v3.0.1
 )

go.sum

@@ -31,6 +31,8 @@ github.com/muesli/cancelreader v0.2.2 h1:3I4Kt4BQjOR54NavqnDogx/MIoWBFa0StPA8ELU
 github.com/muesli/cancelreader v0.2.2/go.mod h1:3XuTXfFS2VjM+HTLZY9Ak0l6eUKfijIfMUZ4EgX0QYo=
 github.com/muesli/termenv v0.16.0 h1:S5AlUN9dENB57rsbnkPyfdGuWIlkmzJjbFf0Tf5FWUc=
 github.com/muesli/termenv v0.16.0/go.mod h1:ZRfOIKPFDYQoDFF4Olj7/QJbW60Ol/kL1pU3VfY/Cnk=
+github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
+github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=

internal/agent/agent.go

@@ -42,6 +42,7 @@ type Agent interface {
 func GetAllAgents() []Agent {
 	return []Agent{
 		NewClaudeAgent(),
+		NewCodexAgent(),
 		NewCursorAgent(),
 		NewGeminiAgent(),
 		NewOpenCodeAgent(),
@@ -64,6 +65,8 @@ func matchAgentName(agentName, input string) bool {
 	switch input {
 	case "claude", "claudecode", "claude-code", "claude_code":
 		return agentName == "Claude Code"
+	case "codex", "codexcli", "codex-cli", "codex_cli":
+		return agentName == "Codex"
 	case "cursor":
 		return agentName == "Cursor"
 	case "gemini", "geminicli", "gemini-cli", "gemini_cli":