my-pi

my-pi

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my-pi is a local-first Model Context Protocol (MCP) runtime for coding agents that need controlled access to a real codebase without handing the agent an unrestricted shell.

It combines bounded filesystem operations, content-preconditioned writes, structural AST search, language-server navigation, Git status/diff tooling, and an explicit read-only-by-default security model behind one stdio MCP server.

Why my-pi

• Local-first: source code and detailed workspace state stay on the host.
• Read-only by default: mutation and language-server process startup require explicit elevation.
• Safer writes: updates can be guarded by content fingerprints instead of blind overwrites.
• Code-aware navigation: Tree-Sitter AST search plus LSP symbols, definitions, references, hover, and diagnostics.
• Git-aware context: bounded status and diff capabilities without exposing an unrestricted command runner.
• Host-neutral: designed for MCP-capable coding environments including Claude Code, Cursor, and OpenCode.

Install and run

Requires Node.js >=24.0.0.

npm install -g @koonwang03/my-pimy-pi-mcp --workspace /path/to/project

Or inspect a generated host configuration without a global install:

npx --yes --package @koonwang03/my-pi my-pi-mcp host-config cursor-local

The server starts in the read-only security profile. Enable writes and language-server processes only for a trusted workspace:

my-pi-mcp --workspace /path/to/project --security-profile trusted

Starting without --workspace or MY_PI_WORKSPACE_ROOT fails closed. Use --allow-cwd only as an intentional opt-in to the current directory.

Core MCP capabilities

The stable alpha surface exposes 13 tools across four groups:

• Filesystem: fs_read, fs_write, fs_patch, fs_stat
• Search/workspace: search, workspace_info
• AST/LSP: ast_search, lsp_status, lsp_symbols, lsp_navigate, lsp_diagnostics
• Git: vcs_status, vcs_diff

Structural AST search supports TypeScript, JavaScript, Python, Rust, and Go. LSP integrations support TypeScript, Python, Rust, and Go when compatible language-server executables are available on the host.

Generate host configuration

my-pi-mcp host-config claude-code-localmy-pi-mcp host-config cursor-localmy-pi-mcp host-config opencode-current-local

Security model

my-pi uses explicit workspace authority and pre-read sensitive-path policy. The default profile is intentionally restrictive; trusted mode is an explicit opt-in for mutation and language-server processes.

Review the full security model before enabling trusted mode:

https://github.com/BoxBoxmari/my-pi/blob/main/docs/SECURITY_MODEL.md

Project status

Current release channel: alpha. The package is intended for evaluation and controlled local development while coordination/evaluation features under the repository's "Production Next" work remain experimental.

Repository, architecture, benchmarks, release evidence, and contribution details:

https://github.com/BoxBoxmari/my-pi

The primary executable is my-pi-mcp; ccr-mcp is retained as a compatibility alias.