amcp-agent 0.9.0

amcp: Lego-style coding agent CLI. Core: rg grep/find and read; editing & web search via MCP.

AMCP

A Lego-style coding agent CLI with built-in tools (grep, read files, bash execution) and MCP server integration for extended capabilities (web search, etc.).

X: https://x.com/zhangjintao9020/status/1995170132973466018?s=20

Features

• Built-in Tools: read_file, grep, bash, think, todo, apply_patch, write_file
• MCP Integration: Connect to any MCP server for extended capabilities
• Conversation History: Persistent sessions across runs
• Flexible Configuration: YAML-based agent specifications
• Tool Calling: Automatic tool selection and execution
• ACP Support: Full Agent Client Protocol support for IDE integration (Zed, etc.)
• AGENTS.md Support: Auto-load project-specific rules from AGENTS.md files
• Smart Context Compaction: Intelligent context management with dynamic thresholds
• Multi-Agent System: Primary/Subagent architecture with built-in agent types (coder, explorer, planner)
• Event Bus: Publish/subscribe system for agent communication and extensibility
• Hooks System: Extensible hooks for tool validation, logging, and custom behaviors

Installation

Quick Run with uvx (no install needed)

# Initialize config first (API keys, model settings)
uvx amcp-agent init

# Run the agent
uvx amcp-agent

# Run as ACP server (for IDE integration)
uvx amcp-agent acp serve

From PyPI

# Install from PyPI
pip install amcp-agent

# Or with uv (requires virtual environment or --system flag)
uv pip install amcp-agent              # in a virtual environment
uv pip install --system amcp-agent     # global install without venv

# With Anthropic Claude support
pip install amcp-agent[anthropic]

From Source (development)

# Clone the repository
git clone https://github.com/tao12345666333/amcp.git
cd amcp

# using uv (recommended)
uv venv && source .venv/bin/activate
uv pip install -e .

# or with pip
python -m venv .venv && source .venv/bin/activate
pip install -e .

Usage

# Initialize config
amcp init

# Agent with tool calling (default command)
amcp  # interactive mode with conversation history
amcp --once "create a hello.py file with a hello function"  # single message
amcp --list  # list available agent specifications
amcp --agent path/to/agent.yaml  # use custom agent spec
amcp --session my-session  # use specific session ID
amcp --clear  # clear conversation history

# MCP server management
amcp mcp tools --server exa
amcp mcp call --server exa --tool web_search_exa --args '{"query":"rust async"}'

# Run as ACP agent (for IDE integration)
amcp acp serve

ACP (Agent Client Protocol) Support

AMCP fully supports the Agent Client Protocol for integration with IDEs like Zed.

Features

• Session Management: Create, load, and list sessions
• Session Modes: Switch between ask, architect, and code modes
  • ask: Request permission before making changes
  • architect: Design and plan without implementation
  • code: Full tool access for implementation
• Slash Commands: /clear, /plan, /search, /help
• Agent Plans: Visual execution plans for complex tasks
• Permission Requests: User approval for sensitive operations
• Client Capabilities: Use client's filesystem and terminal when available

Running as ACP Agent

# Start the ACP agent server (stdio transport)
amcp acp serve

Zed Integration

Add to your Zed settings (~/.config/zed/settings.json):

{
  "agent": {
    "profiles": {
      "amcp": {
        "name": "AMCP",
        "provider": {
          "type": "acp",
          "command": "amcp",
          "args": ["acp", "serve"]
        }
      }
    },
    "default_profile": "amcp"
  }
}

Built-in Tools

• read_file: Read text files with two modes:
  • Slice mode (default): Read specific line ranges
  • Indentation mode: Intelligently read code blocks around an anchor line, automatically capturing surrounding context (functions, classes)
• grep: Search for patterns in files using ripgrep
• bash: Execute bash commands for file operations and system tasks
• think: Internal reasoning and planning
• todo: Manage a todo list to track tasks during complex operations
• apply_patch: Apply diff-based patches to files (recommended for edits, see docs/apply-patch.md)
• write_file: Write content to files (for creating new small files)
• task: Spawn sub-agents for parallel task execution

Config

The CLI loads MCP servers from ~/.config/amcp/config.toml. Generate a starter config:

amcp init

Example (OpenAI-compatible API):

[servers.exa]
url = "https://mcp.exa.ai/mcp"

[servers.custom]
command = "npx"
args = ["-y", "@some/mcp-server"]
env.API_KEY = "your-key"

[chat]
api_type = "openai"  # "openai" (default) or "anthropic"
base_url = "https://api.openai.com/v1"
model = "gpt-4o"
api_key = "your-api-key"
mcp_tools_enabled = true
write_tool_enabled = true  # Enable/disable built-in write_file tool

Example (OpenAI Responses API):

[chat]
api_type = "openai_responses"
model = "gpt-4o"
api_key = "your-api-key"

Example (Anthropic Claude):

[chat]
api_type = "anthropic"
model = "claude-sonnet-4-20250514"
api_key = "your-anthropic-api-key"  # or set ANTHROPIC_API_KEY env var

To use Anthropic, install with: pip install amcp-agent[anthropic]

Hooks System

AMCP provides a flexible hooks system to extend and customize agent behavior. Hooks can:

• Validate and modify tool inputs before execution
• Process tool outputs after execution
• Block dangerous operations
• Log and audit agent activities

Quick Example

Create .amcp/hooks.toml in your project:

[hooks.PreToolUse]
[[hooks.PreToolUse.handlers]]
matcher = "write_file|apply_patch"
type = "python"
script = "./scripts/validate-writes.py"
timeout = 30

[[hooks.PostToolUse.handlers]]
matcher = "*"
type = "command"
command = "echo 'Tool executed' >> /tmp/tool_log.txt"

See docs/hooks.md for full documentation.

Development

Setup Development Environment

# Clone the repository
git clone https://github.com/tao12345666333/amcp.git
cd AMCP

# Install with development dependencies
pip install -e ".[dev]"

# Install pre-commit hooks
pre-commit install

Running Tests

# Run all tests
make test

# Run with coverage
make test-cov

# Run specific test
pytest tests/test_tools.py -v

Code Quality

# Lint code
make lint

# Format code
make format

# Type check
make type-check

See CONTRIBUTING.md for detailed development guidelines.

Notes

• rg (ripgrep) must be installed and on PATH for the grep tool.
• MCP servers must be installed separately and runnable (stdio transport).

License

Apache-2.0