io.github.LovRanRan/mcp-ast-explorer

MCP AST Explorer

Is the MCP AST Explorer MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-13.

Python symbol exploration for codebase onboarding agents.

alive probed 2026-11-15 · unchanged since 2026-11-13

6tools

591tokens in Claude Opus 5.5

0.3 %of Claude's 200k window

0.2×the median server

8.7 sto initialize

579 msto list tools

Run it: uvx mcp-ast-explorer@0.1.0 (stdio, probed in a container with the network off)
Host: pypi.org
Reports itself as: mcp-ast-explorer 4.1.8
Capabilities: logging, prompts, resources, tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 591 tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 681. The o200k_base estimate is 310. Counted again when the tool definitions change. Method.
Repository: https://github.com/LovRanRan/mcp-ast-explorer
Registry: active, updated 2026-05-25 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.91×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
call_chain	128	67	22 %
class_hierarchy	109	57	18 %
find_references	105	55	18 %
find_definition	103	54	17 %
function_signature	103	54	17 %

Other registry entries on pypi.org, the ones next to this name; all of them.

Servers that mention explorer.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.