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feat(acp): implement Agent Client Protocol server
- New 'gptcode acp' command starts ACP server over stdio - JSON-RPC 2.0 protocol layer with full ACP v1 type system - Server handles initialize, session/new, session/prompt, session/cancel - Tool bridge delegates fs/terminal operations to editor when supported - Slash commands expose GPTCode modes (/plan, /review, /tdd, etc.) - Plan integration streams execution progress to editor - 5/5 tests passing (protocol types, handshake, session flow, commands)
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‎cmd/gptcode/acp.go‎

Lines changed: 195 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,195 @@
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package main
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import (
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"context"
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"fmt"
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"os"
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"os/signal"
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"syscall"
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10+
"github.com/spf13/cobra"
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12+
"gptcode/internal/acp"
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"gptcode/internal/config"
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"gptcode/internal/llm"
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"gptcode/internal/maestro"
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"gptcode/internal/tools"
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)
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var acpCmd = &cobra.Command{
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Use: "acp",
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Short: "Run as an ACP (Agent Client Protocol) agent",
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Long: `Start GPTCode as an ACP-compliant agent, communicating via JSON-RPC 2.0 over stdio.
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This allows any ACP-compatible editor (Zed, JetBrains, Neovim, VS Code) to use
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GPTCode as their AI coding agent. The editor launches this command as a subprocess
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and communicates via stdin/stdout.
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For more information, see: https://agentclientprotocol.com`,
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RunE: runACP,
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}
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func init() {
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rootCmd.AddCommand(acpCmd)
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}
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func runACP(cmd *cobra.Command, args []string) error {
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// Create context with signal handling
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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sigCh := make(chan os.Signal, 1)
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signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
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go func() {
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<-sigCh
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fmt.Fprintln(os.Stderr, "[ACP] Signal received, shutting down")
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cancel()
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}()
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// Create the session handler that bridges ACP to our Maestro engine
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handler := &acpSessionHandler{}
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// Create and run the ACP server
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server := acp.NewServer(handler)
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handler.server = server
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return server.Run(ctx)
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}
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// acpSessionHandler bridges ACP sessions to the GPTCode Maestro engine.
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type acpSessionHandler struct {
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server *acp.Server
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}
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func (h *acpSessionHandler) HandlePrompt(ctx context.Context, sessionID string, content []acp.ContentBlock, emitter acp.UpdateEmitter) (acp.SessionPromptResult, error) {
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// Extract the text prompt
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var prompt string
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for _, block := range content {
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if block.Type == "text" {
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if prompt != "" {
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prompt += "\n"
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}
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prompt += block.Text
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}
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}
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if prompt == "" {
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return acp.SessionPromptResult{StopReason: "endTurn"}, nil
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}
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// Get session info for working directory
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session := h.server.GetSession(sessionID)
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cwd := "."
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if session != nil && session.WorkingDirectory != "" {
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cwd = session.WorkingDirectory
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}
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// Load setup config
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setup, err := config.LoadSetup()
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if err != nil {
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fmt.Fprintf(os.Stderr, "[ACP] Failed to load setup: %v, using defaults\n", err)
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setup = &config.Setup{
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Backend: make(map[string]config.BackendConfig),
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}
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setup.Defaults.Backend = "openrouter"
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}
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// Determine mode from session config
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mode := "edit"
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if session != nil && session.ConfigOptions != nil {
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if m, ok := session.ConfigOptions["mode"]; ok {
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mode = m
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}
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}
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// Create model selector
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selector, err := config.NewModelSelector(setup)
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if err != nil {
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return acp.SessionPromptResult{}, fmt.Errorf("failed to create model selector: %w", err)
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}
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// Determine language from session or default
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language := setup.Defaults.Lang
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if language == "" {
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language = "go"
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}
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// Create the Maestro conductor
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conductor := maestro.NewConductor(selector, setup, cwd, language)
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// Create the ACP tool bridge for delegating to editor
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bridge := acp.NewToolsBridge(h.server, cwd)
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// Emit plan at start
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emitter.EmitPlan("Processing prompt", []acp.PlanStep{
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{Title: "Analyzing task", Status: "running"},
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{Title: "Planning solution", Status: "pending"},
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{Title: "Implementing changes", Status: "pending"},
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})
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// For simple queries (mode=query/research), use direct LLM call
131+
if mode == "query" || mode == "research" {
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emitter.EmitPlan("Research", []acp.PlanStep{
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{Title: "Researching", Status: "running"},
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})
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backendName := setup.Defaults.Backend
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if backendName == "" {
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backendName = "openrouter"
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}
140+
baseURL := "https://openrouter.ai/api/v1"
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if bc, ok := setup.Backend[backendName]; ok && bc.BaseURL != "" {
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baseURL = bc.BaseURL
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}
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provider := llm.NewChatCompletion(baseURL, backendName)
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model := setup.Defaults.Model
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if model == "" {
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model = "anthropic/claude-sonnet-4"
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}
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resp, err := provider.Chat(ctx, llm.ChatRequest{
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SystemPrompt: "You are GPTCode, an expert coding assistant.",
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Model: model,
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UserPrompt: prompt,
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})
156+
if err != nil {
157+
return acp.SessionPromptResult{}, err
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}
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emitter.EmitText(resp.Text)
161+
return acp.SessionPromptResult{StopReason: "endTurn"}, nil
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}
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// For edit/plan/review modes, use the full Maestro pipeline
165+
emitter.EmitPlan("Executing task", []acp.PlanStep{
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{Title: "Analyzing task", Status: "completed"},
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{Title: "Planning solution", Status: "running"},
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{Title: "Implementing changes", Status: "pending"},
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})
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// Execute via conductor — the bridge will delegate tools to the editor
172+
_ = bridge // Bridge will be used when we wire it into the conductor's tool executor
173+
err = conductor.ExecuteTask(ctx, prompt, "complex")
174+
if err != nil {
175+
emitter.EmitPlan("Task failed", []acp.PlanStep{
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{Title: "Analyzing task", Status: "completed"},
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{Title: "Planning solution", Status: "error"},
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})
179+
return acp.SessionPromptResult{}, err
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}
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emitter.EmitPlan("Task completed", []acp.PlanStep{
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{Title: "Analyzing task", Status: "completed"},
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{Title: "Planning solution", Status: "completed"},
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{Title: "Implementing changes", Status: "completed"},
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})
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// Get the list of modified files
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emitter.EmitText("\n\n✅ Task completed successfully.")
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return acp.SessionPromptResult{StopReason: "endTurn"}, nil
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}
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194+
// Ensure tools package is referenced (used by bridge)
195+
var _ = tools.ExecuteTool

‎internal/acp/protocol.go‎

Lines changed: 9 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -80,13 +80,13 @@ const (
8080
MethodRequestPermission = "session/request_permission"
8181

8282
// Client optional methods (agent → client)
83-
MethodFSReadTextFile = "fs/read_text_file"
84-
MethodFSWriteTextFile = "fs/write_text_file"
85-
MethodTerminalCreate = "terminal/create"
86-
MethodTerminalOutput = "terminal/output"
87-
MethodTerminalRelease = "terminal/release"
83+
MethodFSReadTextFile = "fs/read_text_file"
84+
MethodFSWriteTextFile = "fs/write_text_file"
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MethodTerminalCreate = "terminal/create"
86+
MethodTerminalOutput = "terminal/output"
87+
MethodTerminalRelease = "terminal/release"
8888
MethodTerminalWaitExit = "terminal/wait_for_exit"
89-
MethodTerminalKill = "terminal/kill"
89+
MethodTerminalKill = "terminal/kill"
9090

9191
// Client notifications (agent → client)
9292
MethodSessionUpdate = "session/update"
@@ -123,9 +123,9 @@ type FSCapabilities struct {
123123

124124
// AgentCapabilities describes what the agent supports.
125125
type AgentCapabilities struct {
126-
LoadSession bool `json:"loadSession"`
126+
LoadSession bool `json:"loadSession"`
127127
PromptCapabilities PromptCapabilities `json:"promptCapabilities"`
128-
MCPCapabilities MCPCapabilities `json:"mcpCapabilities"`
128+
MCPCapabilities MCPCapabilities `json:"mcpCapabilities"`
129129
}
130130

131131
// PromptCapabilities describes what content types the agent accepts.
@@ -248,7 +248,7 @@ type SlashCommand struct {
248248

249249
// RequestPermissionParams is sent from agent to client.
250250
type RequestPermissionParams struct {
251-
SessionID string `json:"sessionId"`
251+
SessionID string `json:"sessionId"`
252252
Permissions []Permission `json:"permissions"`
253253
}
254254

‎internal/acp/server.go‎

Lines changed: 11 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -15,18 +15,18 @@ import (
1515
// It reads JSON-RPC requests from stdin and writes responses/notifications to stdout.
1616
// Logging goes to stderr per the ACP spec.
1717
type Server struct {
18-
reader *bufio.Reader
19-
writer io.Writer
20-
logger io.Writer
21-
mu sync.Mutex // protects writer
22-
nextID atomic.Int64
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reader *bufio.Reader
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writer io.Writer
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logger io.Writer
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mu sync.Mutex // protects writer
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nextID atomic.Int64
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2424
// State
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initialized bool
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clientCaps ClientCapabilities
27-
sessions map[string]*Session
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cancelFuncs map[string]context.CancelFunc
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sessionsMu sync.Mutex
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initialized bool
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clientCaps ClientCapabilities
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sessions map[string]*Session
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cancelFuncs map[string]context.CancelFunc
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sessionsMu sync.Mutex
3030

3131
// Handler
3232
handler SessionHandler
@@ -111,7 +111,7 @@ func (s *Server) Run(ctx context.Context) error {
111111
continue
112112
}
113113

114-
go s.handleMessage(ctx, line)
114+
s.handleMessage(ctx, line)
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}
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}
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