# TAKT

🇯🇵 [日本語ドキュメント](./docs/README.ja.md)

**T**ask **A**gent **K**oordination **T**ool - Multi-agent orchestration system for Claude Code and OpenAI Codex.

TAKT is built with TAKT (dogfooding).

## Requirements

You need one of the following:

- **Anthropic API Key** or **OpenAI API Key**
- [Claude Code](https://docs.anthropic.com/en/docs/claude-code) or [Codex](https://github.com/openai/codex) installed and configured

Additional requirements:

- [GitHub CLI](https://cli.github.com/) (`gh`) — required only for `takt #N` (GitHub Issue execution)

**About pricing**: When using API keys, TAKT calls Claude API (Anthropic) or OpenAI API directly. The pricing is the same as using Claude Code or Codex. Be mindful of costs, especially when running tasks automatically in CI/CD environments, as API usage can accumulate quickly.

TAKT supports both Claude (Anthropic) and Codex (OpenAI) as providers.

## Installation

```bash
npm install -g takt
```

## Quick Start

```bash
# Interactive planning — refine task requirements with AI, then execute
takt

# You can also provide an initial message to start the conversation
takt hello

# Run a GitHub issue as a task (both are equivalent)
takt #6
takt --issue 6

# Pipeline mode (non-interactive, for scripts and CI)
takt --pipeline --task "fix the auth bug" --auto-pr
```

### What happens when you run a task

When you run `takt #6` (GitHub issue reference), TAKT guides you through an interactive flow:

**1. Workflow selection**

```
Select workflow:
  (↑↓ to move, Enter to select)

  ❯ default (current) (default)
    expert
    expert-cqrs
    magi
    research
    simple
    Cancel
```

**2. Isolated clone** (optional)

```
? Create worktree? (Y/n)
```

Choose `y` to run in a `git clone --shared` isolated environment, keeping your working directory clean.

**3. Execution** — The selected workflow orchestrates multiple agents to complete the task.

**4. PR creation** (after worktree execution)

```
? Create pull request? (y/N)
```

If `--auto-pr` is specified, the PR is created automatically without asking.

### Recommended workflows

| Workflow | Best for |
|----------|----------|
| `default` | Full development tasks. Used for TAKT's own development. Multi-stage review with parallel architect + security review. |
| `minimal` | Quick fixes and simple tasks. Minimal workflow with basic review. |
| `review-fix-minimal` | Review and fix workflow. Focused on iterative improvements with review feedback. |
| `research` | Research and investigation. Autonomous research without asking questions. |

## Commands

### Interactive Mode (default)

The standard mode for everyday development. Workflow selection, worktree creation, and PR creation are handled interactively.

```bash
# Interactive planning — start AI conversation to refine task requirements
takt

# You can also provide an initial message to start the conversation
takt hello

# Run a GitHub issue as a task (both are equivalent)
takt #6
takt --issue 6

# Automatically create a PR (skip the confirmation prompt)
takt #6 --auto-pr

# Use --task option to specify task content (alternative to GitHub issue)
takt --task "Add login feature"
```

When `--auto-pr` is not specified, you will be asked whether to create a PR after a successful worktree execution.

### Pipeline Mode (`--pipeline`)

Specifying `--pipeline` enters pipeline mode — fully non-interactive, suitable for scripts and CI integration. TAKT automatically creates a branch, runs the workflow, commits, and pushes.

```bash
# Run a task in pipeline mode
takt --pipeline --task "fix the auth bug"

# Pipeline mode + automatic PR creation
takt --pipeline --task "fix the auth bug" --auto-pr

# Attach GitHub issue context
takt --pipeline --issue 99 --auto-pr

# Specify workflow and branch
takt --pipeline --task "fix the auth bug" -w magi -b feat/fix-auth

# Specify repository (for PR creation)
takt --pipeline --task "fix the auth bug" --auto-pr --repo owner/repo

# Run workflow only — skip branch creation, commit, and push
takt --pipeline --task "fix the auth bug" --skip-git
```

In pipeline mode, PRs are **not** created unless `--auto-pr` is explicitly specified.

### Subcommands

| Command | Description |
|---------|-------------|
| `takt run` | Run all pending tasks from `.takt/tasks/` |
| `takt watch` | Watch `.takt/tasks/` and auto-execute tasks (stays resident) |
| `takt add` | Add a new task via AI conversation |
| `takt list` | List task branches (try merge, merge & cleanup, or delete) |
| `takt switch` | Switch workflow interactively |
| `takt clear` | Clear agent conversation sessions |
| `takt eject` | Copy builtin workflow/agents to `~/.takt/` for customization |
| `takt config` | Configure permission mode |
| `takt --help` | Show help |

### Options

| Option | Description |
|--------|-------------|
| `--pipeline` | **Enable pipeline (non-interactive) mode** — required for CI/automation |
| `-t, --task <text>` | Task content (as alternative to GitHub issue) |
| `-i, --issue <N>` | GitHub issue number (equivalent to `#N` in interactive mode) |
| `-w, --workflow <name or path>` | Workflow name or path to workflow YAML file |
| `-b, --branch <name>` | Branch name (auto-generated if omitted) |
| `--auto-pr` | Create PR after execution (interactive: skip confirmation, pipeline: enable PR) |
| `--skip-git` | Skip branch creation, commit, and push (pipeline mode, workflow-only) |
| `--repo <owner/repo>` | Repository for PR creation |
| `--create-worktree <yes\|no>` | Skip worktree confirmation prompt |
| `-q, --quiet` | Minimal output mode: suppress AI output (for CI) |
| `--provider <name>` | Override agent provider (claude\|codex\|mock) |
| `--model <name>` | Override agent model |
| `--config <path>` | Path to global config file (default: `~/.takt/config.yaml`) |

## Workflows

TAKT uses YAML-based workflow definitions with rule-based routing. Builtin workflows are embedded in the package; user workflows in `~/.takt/workflows/` take priority. Use `takt eject` to copy a builtin to `~/.takt/` for customization.

### Example Workflow

```yaml
name: default
max_iterations: 10
initial_step: plan

steps:
  - name: plan
    agent: ../agents/default/planner.md
    model: opus
    edit: false
    rules:
      - condition: Plan complete
        next: implement
    instruction_template: |
      Analyze the request and create an implementation plan.

  - name: implement
    agent: ../agents/default/coder.md
    edit: true
    permission_mode: edit
    rules:
      - condition: Implementation complete
        next: review
      - condition: Cannot proceed
        next: ABORT
    instruction_template: |
      Implement based on the plan.

  - name: review
    agent: ../agents/default/architecture-reviewer.md
    edit: false
    rules:
      - condition: Approved
        next: COMPLETE
      - condition: Needs fix
        next: implement
    instruction_template: |
      Review the implementation for architecture and code quality.
```

### Agent-less Steps

The `agent` field is optional. When omitted, the step executes using only the `instruction_template` without a system prompt. This is useful for simple tasks where agent behavior customization is not needed.

```yaml
  - name: summarize
    # No agent specified — uses instruction_template only
    edit: false
    rules:
      - condition: Summary complete
        next: COMPLETE
    instruction_template: |
      Read the reports and provide a brief summary.
```

You can also provide an inline system prompt as the `agent` value (when the specified file does not exist):

```yaml
  - name: review
    agent: "You are a code reviewer. Focus on readability and maintainability."
    edit: false
    instruction_template: |
      Review the code for quality.
```

### Parallel Steps

Steps can execute sub-steps concurrently with aggregate evaluation:

```yaml
  - name: reviewers
    parallel:
      - name: arch-review
        agent: ../agents/default/architecture-reviewer.md
        rules:
          - condition: approved
          - condition: needs_fix
        instruction_template: |
          Review architecture and code quality.
      - name: security-review
        agent: ../agents/default/security-reviewer.md
        rules:
          - condition: approved
          - condition: needs_fix
        instruction_template: |
          Review for security vulnerabilities.
    rules:
      - condition: all("approved")
        next: supervise
      - condition: any("needs_fix")
        next: fix
```

- `all("X")`: true if ALL sub-steps matched condition X
- `any("X")`: true if ANY sub-step matched condition X
- Sub-step `rules` define possible outcomes; `next` is optional (parent handles routing)

### Rule Condition Types

| Type | Syntax | Description |
|------|--------|-------------|
| Tag-based | `"condition text"` | Agent outputs `[STEP:N]` tag, matched by index |
| AI judge | `ai("condition text")` | AI evaluates the condition against agent output |
| Aggregate | `all("X")` / `any("X")` | Aggregates parallel sub-step results |

## Built-in Workflows

TAKT ships with several built-in workflows:

| Workflow | Description |
|----------|-------------|
| `minimal` | Quick workflow: plan → implement → review → supervisor. Minimal steps for fast iteration. |
| `default` | Full development workflow: plan → implement → AI review → parallel reviewers (architect + security) → supervisor approval. Includes fix loops for each review stage. |
| `review-fix-minimal` | Review-focused workflow: review → fix → supervisor. For iterative improvements based on review feedback. |
| `research` | Research workflow: planner → digger → supervisor. Autonomously researches topics without asking questions. |
| `expert` | Sequential review with domain experts: Architecture, Frontend, Security, QA reviews with fix loops. |
| `expert-cqrs` | Sequential review with domain experts: CQRS+ES, Frontend, Security, QA reviews with fix loops. |
| `magi` | Deliberation system inspired by Evangelion. Three AI personas (MELCHIOR, BALTHASAR, CASPER) analyze and vote. |
| `review-only` | Read-only code review workflow without making any modifications. |

Switch between workflows with `takt switch`.

## Built-in Agents

| Agent | Description |
|-------|-------------|
| **planner** | Task analysis, spec investigation, and implementation planning |
| **coder** | Implements features and fixes bugs |
| **ai-antipattern-reviewer** | Reviews for AI-specific anti-patterns (hallucinated APIs, incorrect assumptions, scope creep) |
| **architecture-reviewer** | Reviews architecture and code quality, verifies spec compliance |
| **security-reviewer** | Security vulnerability assessment |
| **supervisor** | Final verification, validation, and approval |

## Custom Agents

Define custom agents in `.takt/agents.yaml`:

```yaml
agents:
  - name: my-reviewer
    prompt_file: .takt/prompts/reviewer.md
    allowed_tools: [Read, Glob, Grep]
    provider: claude             # Optional: claude or codex
    model: opus                  # Claude: opus/sonnet/haiku or full name (claude-opus-4-5-20251101)
```

Or create agent prompt files as Markdown:

```markdown
# ~/.takt/agents/my-agents/reviewer.md

You are a code reviewer focused on security.

## Your Role
- Check for security vulnerabilities
- Verify input validation
- Review authentication logic
```

## Model Selection

The `model` field in workflow steps, agent configs, and global config is passed directly to the provider (Claude Code CLI or Codex SDK). TAKT does not resolve model aliases — the provider handles that.

### Claude Code

Claude Code supports aliases (`opus`, `sonnet`, `haiku`, `opusplan`, `default`) and full model names (e.g., `claude-sonnet-4-5-20250929`). See [Claude Code documentation](https://docs.anthropic.com/en/docs/claude-code) for available models.

### Codex

The model string is passed to the Codex SDK. Defaults to `codex` if not specified. See Codex documentation for available models.

## Project Structure

```
~/.takt/
├── config.yaml          # Global config (provider, model, workflows, etc.)
├── workflows/           # User workflow definitions (override builtins)
└── agents/              # User agent prompt files

.takt/                   # Project-level config
├── agents.yaml          # Custom agent definitions
├── tasks/               # Pending task files (.yaml, .md)
├── completed/           # Completed tasks with reports
├── reports/             # Execution reports (auto-generated)
└── logs/                # Session logs in NDJSON format
    ├── latest.json      # Pointer to current/latest session
    ├── previous.json    # Pointer to previous session
    └── {sessionId}.jsonl # NDJSON session log per workflow run
```

Builtin resources are embedded in the npm package (`dist/resources/`). User files in `~/.takt/` take priority.

### Global Configuration

Configure default provider and model in `~/.takt/config.yaml`:

```yaml
# ~/.takt/config.yaml
language: en
default_workflow: default
log_level: info
provider: claude         # Default provider: claude or codex
model: sonnet            # Default model (optional)

# API Key configuration (optional)
# Can be overridden by TAKT_ANTHROPIC_API_KEY / TAKT_OPENAI_API_KEY env vars
anthropic_api_key: sk-ant-...  # For Claude (Anthropic)
# openai_api_key: sk-...       # For Codex (OpenAI)

trusted_directories:
  - /path/to/trusted/dir

# Pipeline execution settings (optional)
# Customize branch naming, commit messages, and PR body for pipeline mode.
# pipeline:
#   default_branch_prefix: "takt/"
#   commit_message_template: "feat: {title} (#{issue})"
#   pr_body_template: |
#     ## Summary
#     {issue_body}
#     Closes #{issue}
```

**API Key configuration:**

1. **Using environment variables** (recommended):
   ```bash
   export TAKT_ANTHROPIC_API_KEY=sk-ant-...  # For Claude
   # or
   export TAKT_OPENAI_API_KEY=sk-...         # For Codex
   ```

2. **Using config file**:
   Add `anthropic_api_key` or `openai_api_key` to `~/.takt/config.yaml` as shown above

Priority: Environment variables > `config.yaml` settings

**Note**: When API keys are configured, Claude Code or Codex installation is not required. TAKT will call Anthropic API or OpenAI API directly.

**Pipeline template variables:**

| Variable | Available in | Description |
|----------|-------------|-------------|
| `{title}` | commit message | Issue title |
| `{issue}` | commit message, PR body | Issue number |
| `{issue_body}` | PR body | Issue body text |
| `{report}` | PR body | Workflow execution report |

**Model Resolution Priority:**
1. Workflow step `model` (highest priority)
2. Custom agent `model`
3. Global config `model`
4. Provider default (Claude: sonnet, Codex: gpt-5.2-codex)


## Practical Usage Guide

### Interactive Workflow

When running `takt` (interactive planning mode) or `takt #6` (GitHub issue), you are prompted to:

1. **Select a workflow** - Choose from available workflows (arrow keys, ESC to cancel)
2. **Create an isolated clone** (optional) - Run the task in a `git clone --shared` for isolation
3. **Create a pull request** (after worktree execution) - Create a PR from the task branch

If `--auto-pr` is specified, the PR confirmation is skipped and the PR is created automatically.

### Adding Custom Workflows

Create your own workflow by adding YAML files to `~/.takt/workflows/`, or use `/eject` to customize a builtin:

```bash
# Copy the default workflow to ~/.takt/workflows/ for editing
takt eject default
```

```yaml
# ~/.takt/workflows/my-workflow.yaml
name: my-workflow
description: My custom workflow
max_iterations: 5
initial_step: analyze

steps:
  - name: analyze
    agent: ~/.takt/agents/my-agents/analyzer.md
    edit: false
    rules:
      - condition: Analysis complete
        next: implement
    instruction_template: |
      Analyze this request thoroughly.

  - name: implement
    agent: ~/.takt/agents/default/coder.md
    edit: true
    permission_mode: edit
    pass_previous_response: true
    rules:
      - condition: Done
        next: COMPLETE
    instruction_template: |
      Implement based on the analysis.
```

> **Note**: `{task}`, `{previous_response}`, and `{user_inputs}` are auto-injected into instructions. You only need explicit placeholders if you want to control their position in the template.

### Specifying Agents by Path

Agents are specified using file paths in workflow definitions:

```yaml
# Relative to workflow file directory
agent: ../agents/default/coder.md

# Home directory
agent: ~/.takt/agents/default/coder.md

# Absolute paths
agent: /path/to/custom/agent.md
```

### Task Management

TAKT supports batch task processing through task files in `.takt/tasks/`. Both `.yaml`/`.yml` and `.md` file formats are supported.

#### Adding Tasks with `takt add`

```bash
# Start AI conversation to define and add a task
takt add

# Add task from GitHub issue (issue number reflected in branch name)
takt add #28
```

The `takt add` command starts an AI conversation where you discuss and refine your task requirements. After confirming with `/go`, the AI summarizes the conversation and creates a YAML task file with optional worktree/branch/workflow settings. When using `takt add #N`, the issue number is automatically reflected in the branch name (e.g., `takt/issue-28-...`).

#### Task File Formats

**YAML format** (recommended, supports worktree/branch/workflow options):

```yaml
# .takt/tasks/add-auth.yaml
task: "Add authentication feature"
worktree: true                  # Run in isolated shared clone
branch: "feat/add-auth"         # Branch name (auto-generated if omitted)
workflow: "default"             # Workflow override (uses current if omitted)
```

**Markdown format** (simple, backward compatible):

```markdown
# .takt/tasks/add-login-feature.md

Add a login feature to the application.

Requirements:
- Username and password fields
- Form validation
- Error handling for failed attempts
```

#### Isolated Execution (Shared Clone)

YAML task files can specify `worktree` to run each task in an isolated `git clone --shared`, keeping the main working directory clean:

- `worktree: true` - Auto-create a shared clone in a sibling directory (or `worktree_dir` from config)
- `worktree: "/path/to/dir"` - Create at specified path
- `branch: "feat/xxx"` - Use specified branch (auto-generated as `takt/{timestamp}-{slug}` if omitted)
- Omit `worktree` - Run in current working directory (default)

> **Note**: The YAML field is named `worktree` for backward compatibility. Internally, `git clone --shared` is used instead of `git worktree` because git worktrees have a `.git` file with `gitdir:` that points back to the main repository, causing Claude Code to recognize the main repo as the project root. Shared clones have an independent `.git` directory that avoids this issue.

Clones are ephemeral. When a task completes successfully, TAKT automatically commits all changes and pushes the branch to the main repository, then deletes the clone. Use `takt list` to list, try-merge, or delete task branches.

#### Running Tasks with `/run-tasks`

```bash
takt run
```

- Tasks are executed in alphabetical order (use prefixes like `001-`, `002-` for ordering)
- Completed tasks are moved to `.takt/completed/` with execution reports
- New tasks added during execution will be picked up dynamically

#### Watching Tasks with `/watch`

```bash
takt watch
```

Watch mode polls `.takt/tasks/` for new task files and auto-executes them as they appear. The process stays resident until `Ctrl+C`. This is useful for:
- CI/CD pipelines that generate task files
- Automated workflows where tasks are added by external processes
- Long-running development sessions where tasks are queued over time

#### Listing Task Branches with `/list-tasks`

```bash
takt list
```

Lists all `takt/`-prefixed branches with file change counts. For each branch you can:
- **Try merge** - Squash merge into main (stage changes without committing)
- **Instruct** - Give additional instructions via a temporary clone
- **Merge & cleanup** - Merge and delete the branch
- **Delete** - Delete the branch without merging

### Session Logs

TAKT writes session logs in NDJSON (`.jsonl`) format to `.takt/logs/`. Each record is appended atomically, so even if the process crashes mid-execution, partial logs are preserved and logs can be tailed in real-time with `tail -f`.

- `.takt/logs/latest.json` - Pointer to the current (or most recent) session
- `.takt/logs/previous.json` - Pointer to the previous session
- `.takt/logs/{sessionId}.jsonl` - NDJSON session log with step history

Record types: `workflow_start`, `step_start`, `step_complete`, `workflow_complete`, `workflow_abort`.

Agents can read `previous.json` to pick up context from a prior run. Session continuity is automatic — simply run `takt "task"` to continue where the previous session left off.

### Workflow Variables

Available variables in `instruction_template`:

| Variable | Description |
|----------|-------------|
| `{task}` | Original user request (auto-injected if not in template) |
| `{iteration}` | Workflow-wide turn count (total steps executed) |
| `{max_iterations}` | Maximum iterations allowed |
| `{step_iteration}` | Per-step iteration count (how many times THIS step has run) |
| `{previous_response}` | Previous step's output (auto-injected if not in template) |
| `{user_inputs}` | Additional user inputs during workflow (auto-injected if not in template) |
| `{report_dir}` | Report directory path (e.g., `.takt/reports/20250126-143052-task-summary`) |
| `{report:filename}` | Resolves to `{report_dir}/filename` (e.g., `{report:00-plan.md}`) |

### Designing Workflows

Each workflow step requires:

**1. Agent** - A Markdown file containing the system prompt:

```yaml
agent: ../agents/default/coder.md    # Path to agent prompt file
agent_name: coder                    # Display name (optional)
```

**2. Rules** - Define how the step routes to the next step. The instruction builder auto-injects status output rules so agents know what tags to output:

```yaml
rules:
  - condition: "Implementation complete"
    next: review
  - condition: "Cannot proceed"
    next: ABORT
```

Special `next` values: `COMPLETE` (success), `ABORT` (failure).

**3. Step options:**

| Option | Default | Description |
|--------|---------|-------------|
| `edit` | - | Whether the step can edit project files (`true`/`false`) |
| `pass_previous_response` | `true` | Pass previous step's output to `{previous_response}` |
| `allowed_tools` | - | List of tools the agent can use (Read, Glob, Grep, Edit, Write, Bash, etc.) |
| `provider` | - | Override provider for this step (`claude` or `codex`) |
| `model` | - | Override model for this step |
| `permission_mode` | - | Permission mode: `readonly`, `edit`, or `full` (provider-independent) |
| `report` | - | Report file configuration (name, format) for auto-generated reports |

## API Usage

```typescript
import { WorkflowEngine, loadWorkflow } from 'takt';  // npm install takt

const config = loadWorkflow('default');
if (!config) {
  throw new Error('Workflow not found');
}
const engine = new WorkflowEngine(config, process.cwd(), 'My task');

engine.on('step:complete', (step, response) => {
  console.log(`${step.name}: ${response.status}`);
});

await engine.run();
```

## Contributing

See [CONTRIBUTING.md](./CONTRIBUTING.md) for details.

## CI/CD Integration

### GitHub Actions

TAKT provides a GitHub Action for automated PR reviews and task execution. See [takt-action](https://github.com/nrslib/takt-action) for details.

**Example workflow** (see [.github/workflows/takt-action.yml](.github/workflows/takt-action.yml) in this repository):

```yaml
name: TAKT

on:
  issue_comment:
    types: [created]

jobs:
  takt:
    if: contains(github.event.comment.body, '@takt')
    runs-on: ubuntu-latest
    permissions:
      contents: write
      issues: write
      pull-requests: write

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Run TAKT
        uses: nrslib/takt-action@main
        with:
          anthropic_api_key: ${{ secrets.TAKT_ANTHROPIC_API_KEY }}
          github_token: ${{ secrets.GITHUB_TOKEN }}
```

**Cost Warning**: TAKT uses AI APIs (Claude or OpenAI) which can incur significant costs, especially in CI/CD environments where tasks run automatically. Monitor your API usage and set billing alerts.

### Other CI Systems

For non-GitHub CI systems, use pipeline mode:

```bash
# Install takt
npm install -g takt

# Run in pipeline mode
takt --pipeline --task "fix bug" --auto-pr --repo owner/repo
```

Set `TAKT_ANTHROPIC_API_KEY` or `TAKT_OPENAI_API_KEY` environment variables for authentication (TAKT-specific prefixed variables).

```bash
# For Claude (Anthropic)
export TAKT_ANTHROPIC_API_KEY=sk-ant-...

# For Codex (OpenAI)
export TAKT_OPENAI_API_KEY=sk-...
```

## Docker Support

Docker environment is provided for testing in other environments:

```bash
# Build Docker images
docker compose build

# Run tests in container
docker compose run --rm test

# Run lint in container
docker compose run --rm lint

# Build only (skip tests)
docker compose run --rm build
```

This ensures the project works correctly in a clean Node.js 20 environment.

## Documentation

- [Workflow Guide](./docs/workflows.md) - Create and customize workflows
- [Agent Guide](./docs/agents.md) - Configure custom agents
- [Changelog](./CHANGELOG.md) - Version history
- [Security Policy](./SECURITY.md) - Vulnerability reporting
- [Blog: TAKT - AI Agent Orchestration](https://zenn.dev/nrs/articles/c6842288a526d7) - Design philosophy and practical usage guide (Japanese)

## License

MIT - See [LICENSE](./LICENSE) for details.