Summary
Parses Python codebases with LibCST and exposes symbol-level tools for agents that need to navigate unfamiliar repositories without hallucinating. You get definition lookup, function signatures, same-file reference tracking, direct call chains, and basic class hierarchy queries. Built as the middle layer in a three-server onboarding stack alongside repo-mapper for structure and test-runner for verification. No LLM inference, so missing symbols return structured not-found responses instead of invented answers. Stays strictly within single-file scope in v1: no cross-file imports, no alias resolution, no dynamic lookups. Reach for this when you're building codebase exploration agents that need deterministic symbol grounding and can't afford to make up functions that don't exist.
Fastest browser for AI agents to run web automation tasks, always free.
Download Free life-time →
Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →
belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →
Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →mcp-ast-explorer
MCP server for deterministic Python codebase symbol exploration.
mcp-ast-explorer indexes Python source files with LibCST and exposes focused MCP tools for codebase onboarding: definition lookup, function signatures, local references, direct call chains, and simple class hierarchy queries.
Codebase Onboarding Stack
mcp-ast-explorer is the semantic symbol layer in a three-server MCP tool stack for Project 6 wayfinder, a codebase onboarding agent.
mcp-repo-mappermaps repository structure, languages, entry points, framework evidence, and Python dependency edges.mcp-ast-explorerprovides symbol-grounded Python definition, signature, reference, call-chain, and class-hierarchy lookups.mcp-test-runnerruns local pytest/Jest checks and coverage summaries so agent claims can be verified against execution.
In wayfinder, this server feeds entry-point and symbol explanation while refusing to invent missing symbols.
Status
This is a Python-only v1. TypeScript is registered as an unsupported backend placeholder so the server has an explicit extension point, but TypeScript analysis is not implemented yet.
The server does not use an LLM for symbol lookup. If a requested symbol or class is not present in the parsed index, tools return a structured not-found result instead of inventing an answer.
Tools
| Tool | Purpose |
|---|---|
health() | Returns ok for smoke checks. |
find_definition(path, symbol, language="python") | Finds a module, class, function, or method definition. |
function_signature(path, symbol, language="python") | Returns the signature for a function or method symbol. |
find_references(path, symbol, language="python") | Returns same-module CST name references for an existing symbol. |
call_chain(path, from_symbol, depth=2, language="python") | Returns direct callers detected from local references. |
class_hierarchy(path, class_name, language="python") | Returns direct subclasses detected from simple base-class names. |
Supported Scope
- Python files parsed by LibCST.
- Symbol kinds: modules, classes, functions, and methods.
- Same-module reference lookup for simple names.
- Direct caller detection from function or method containers.
- Direct subclass detection for simple
class Child(Base):inheritance. - Structured error responses for unsupported languages and missing symbols.
Current Limitations
- Cross-file imports and package-wide resolution are out of scope for v1.
- Aliases, star imports, dynamic attribute access, and qualified references are not resolved.
call_chaincurrently returns direct callers only; recursive multi-hop expansion is not implemented.class_hierarchycurrently returns direct subclasses only and handles simple base names.- TypeScript is intentionally unsupported in v1.
Local Development
Install dependencies:
uv sync --extra dev
Run the MCP server:
uv run mcp-ast-explorer
Run verification:
uv run ruff check .
uv run mypy
uv run pytest
License
MIT
Featured
Fastest browser for AI agents to run web automation tasks, always free.
Download Free life-time →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →