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package api
import (
"context"
"crypto/subtle"
"encoding/json"
"net/http"
"strings"
"time"
"github.com/modelcontextprotocol/go-sdk/mcp"
"github.com/thepeterstone/claudomator/internal/event"
"github.com/thepeterstone/claudomator/internal/storage"
"github.com/thepeterstone/claudomator/internal/task"
)
// The chatbot-facing MCP server lets a chatbot drive task creation and
// orchestration. Unlike the per-task agent server, it spans all tasks and is
// guarded by the single shared API bearer token (config api_token / SetAPIToken).
type submitTaskMCPInput struct {
Instructions string `json:"instructions" jsonschema:"complete instructions for the agent that will run this task"`
Name string `json:"name,omitempty" jsonschema:"short human-readable task name; defaults to the first line of instructions"`
Project string `json:"project,omitempty" jsonschema:"name of a configured project; used to resolve the repository when repository_url is omitted"`
RepositoryURL string `json:"repository_url,omitempty" jsonschema:"git repository URL to work in; required unless a project resolves to one"`
Model string `json:"model,omitempty" jsonschema:"optional model override, e.g. sonnet or opus"`
MaxBudgetUSD float64 `json:"max_budget_usd,omitempty" jsonschema:"optional spend cap in USD"`
Timeout string `json:"timeout,omitempty" jsonschema:"optional duration like 15m or 1h"`
Tags []string `json:"tags,omitempty" jsonschema:"optional tags"`
}
type listTasksMCPInput struct {
State string `json:"state,omitempty" jsonschema:"optional state filter, e.g. RUNNING, READY, BLOCKED, COMPLETED, FAILED"`
Limit int `json:"limit,omitempty" jsonschema:"optional max number of tasks to return"`
}
type taskIDInput struct {
TaskID string `json:"task_id" jsonschema:"the task ID"`
}
type getEventsMCPInput struct {
TaskID string `json:"task_id" jsonschema:"the task ID"`
SinceSeq int64 `json:"since_seq,omitempty" jsonschema:"return only events with seq greater than this value"`
}
type answerQuestionMCPInput struct {
TaskID string `json:"task_id" jsonschema:"the task ID of the BLOCKED task"`
Answer string `json:"answer" jsonschema:"the answer to the agent's question"`
}
type rejectTaskMCPInput struct {
TaskID string `json:"task_id" jsonschema:"the task ID"`
Comment string `json:"comment,omitempty" jsonschema:"optional reason the work was rejected, fed back to the agent on retry"`
}
type compactTask struct {
ID string `json:"id"`
Name string `json:"name"`
State task.State `json:"state"`
Project string `json:"project,omitempty"`
}
func mcpText(text string) *mcp.CallToolResult {
return &mcp.CallToolResult{Content: []mcp.Content{&mcp.TextContent{Text: text}}}
}
func mcpJSON(v any) (*mcp.CallToolResult, any, error) {
b, err := json.MarshalIndent(v, "", " ")
if err != nil {
return nil, nil, err
}
return mcpText(string(b)), nil, nil
}
// newChatbotServer builds the chatbot-facing MCP server bound to this Server's
// store and pool.
func (s *Server) newChatbotServer() *mcp.Server {
srv := mcp.NewServer(&mcp.Implementation{Name: "claudomator-chatbot", Version: "1"}, nil)
mcp.AddTool(srv, &mcp.Tool{
Name: "submit_task",
Description: "Create a task and immediately queue it for execution. Returns the new task ID and state.",
}, func(ctx context.Context, _ *mcp.CallToolRequest, in submitTaskMCPInput) (*mcp.CallToolResult, any, error) {
spec := submitTaskSpec{
Name: in.Name,
Instructions: in.Instructions,
Project: in.Project,
RepositoryURL: in.RepositoryURL,
Model: in.Model,
MaxBudgetUSD: in.MaxBudgetUSD,
Tags: in.Tags,
}
if strings.TrimSpace(in.Timeout) != "" {
d, err := time.ParseDuration(in.Timeout)
if err != nil {
return nil, nil, badRequestf("invalid timeout %q: %v", in.Timeout, err)
}
spec.Timeout = d
}
t, err := s.submitTask(ctx, spec)
if err != nil {
return nil, nil, err
}
return mcpJSON(compactTask{ID: t.ID, Name: t.Name, State: t.State, Project: t.Project})
})
mcp.AddTool(srv, &mcp.Tool{
Name: "list_tasks",
Description: "List tasks, optionally filtered by state. Returns compact records; use get_task for full detail.",
}, func(_ context.Context, _ *mcp.CallToolRequest, in listTasksMCPInput) (*mcp.CallToolResult, any, error) {
filter := storage.TaskFilter{Limit: in.Limit}
if in.State != "" {
st := task.State(in.State)
if !validTaskStates[st] {
return nil, nil, badRequestf("invalid state %q", in.State)
}
filter.State = st
}
tasks, err := s.store.ListTasks(filter)
if err != nil {
return nil, nil, err
}
out := make([]compactTask, 0, len(tasks))
for _, tk := range tasks {
out = append(out, compactTask{ID: tk.ID, Name: tk.Name, State: tk.State, Project: tk.Project})
}
return mcpJSON(out)
})
mcp.AddTool(srv, &mcp.Tool{
Name: "get_task",
Description: "Get one task with enriched detail (changestats, deployment status, error message).",
}, func(_ context.Context, _ *mcp.CallToolRequest, in taskIDInput) (*mcp.CallToolResult, any, error) {
tk, err := s.store.GetTask(in.TaskID)
if err != nil {
return nil, nil, errTaskNotFound
}
return mcpJSON(s.enrichTask(tk))
})
mcp.AddTool(srv, &mcp.Tool{
Name: "get_events",
Description: "Get the observability event stream for a task in seq order. Pass since_seq to page incrementally.",
}, func(_ context.Context, _ *mcp.CallToolRequest, in getEventsMCPInput) (*mcp.CallToolResult, any, error) {
if _, err := s.store.GetTask(in.TaskID); err != nil {
return nil, nil, errTaskNotFound
}
events, err := s.store.ListEvents(in.TaskID, in.SinceSeq)
if err != nil {
return nil, nil, err
}
if events == nil {
events = []*event.Event{}
}
return mcpJSON(events)
})
mcp.AddTool(srv, &mcp.Tool{
Name: "answer_question",
Description: "Answer a BLOCKED task's clarification question. The task resumes from where the agent left off.",
}, func(ctx context.Context, _ *mcp.CallToolRequest, in answerQuestionMCPInput) (*mcp.CallToolResult, any, error) {
if err := s.answerTaskQuestion(ctx, in.TaskID, in.Answer); err != nil {
return nil, nil, err
}
return mcpText("Answer recorded; task queued for resume."), nil, nil
})
mcp.AddTool(srv, &mcp.Tool{
Name: "accept_task",
Description: "Accept a READY task, marking it COMPLETED.",
}, func(ctx context.Context, _ *mcp.CallToolRequest, in taskIDInput) (*mcp.CallToolResult, any, error) {
if err := s.acceptTask(ctx, in.TaskID, event.ActorChatbot); err != nil {
return nil, nil, err
}
return mcpText("Task accepted."), nil, nil
})
mcp.AddTool(srv, &mcp.Tool{
Name: "reject_task",
Description: "Reject a READY task, sending it back to PENDING with an optional comment for the next attempt.",
}, func(_ context.Context, _ *mcp.CallToolRequest, in rejectTaskMCPInput) (*mcp.CallToolResult, any, error) {
if err := s.rejectTask(in.TaskID, in.Comment); err != nil {
return nil, nil, err
}
return mcpText("Task rejected."), nil, nil
})
mcp.AddTool(srv, &mcp.Tool{
Name: "cancel_task",
Description: "Cancel a RUNNING or QUEUED task.",
}, func(_ context.Context, _ *mcp.CallToolRequest, in taskIDInput) (*mcp.CallToolResult, any, error) {
msg, err := s.cancelTask(in.TaskID, event.ActorChatbot)
if err != nil {
return nil, nil, err
}
return mcpText(msg), nil, nil
})
return srv
}
// chatbotMCPHandler returns the HTTP handler for the chatbot MCP server. It
// serves only when an API token is configured and the request presents it as a
// bearer credential; otherwise the underlying handler receives a nil server and
// rejects the request.
func (s *Server) chatbotMCPHandler() http.Handler {
srv := s.newChatbotServer()
return mcp.NewStreamableHTTPHandler(func(r *http.Request) *mcp.Server {
if s.apiToken == "" {
return nil
}
tok := strings.TrimSpace(strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer "))
if subtle.ConstantTimeCompare([]byte(tok), []byte(s.apiToken)) != 1 {
return nil
}
return srv
}, nil)
}
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