LayerMap MCP: a layered map of your codebase for coding agents: callers, callees and the impact of a change, for TypeScript, JavaScript, Go, Python and Java. MCP server, CLI, and plugins for Claude Co
LayerMap tells your coding agent what calls a function and what changing it affects, up to the HTTP routes, in one call. With at most 15 requests, agents found 97.9% of affected endpoints with LayerMap vs 58.8% without; with no limit, Claude Code cost 32% less (benchmark).
Resolved by each language's compiler or type checker, not guessed from names by tree-sitter: calls through interfaces, base classes, templates and decorators link as the compiler links them, for TypeScript, JavaScript, Go, Python and Java.
A real Claude Code session on Miniflux, replayed: one map call finds every endpoint, then the agent confirms them in source.
A layered map of your codebase for coding agents. LayerMap gives Claude Code, Codex, DeepSeek Harness and other MCP clients read-only tools that answer, in one call, what an agent otherwise works out with dozens of searches:
- What calls this, and what does changing it affect? Callers traced up to 8 levels, to the HTTP routes, handlers, jobs and commands they start from. - What does it call? Callees down to 8 levels. - What is here? Modules, each file's declarations, and every usage of a symbol. - What did my edit affect? The routes, jobs and commands the uncommitted changes reach, and the existing tests related to them.
It maps TypeScript, JavaScript, Go, Python and Java with each language's own compiler, so calls through interfaces, base classes, templates and decorators resolve as the compiler resolves them, including the ones text search misses.
From the project README.
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