LayerMap
Maps compiler-resolved callers, callees, usages, routes, and change impact for TypeScript, JavaScript, Go, Python, and Java.
Install LayerMap
Pick your client, then add it in one click or paste the config.
~/Library/Application Support/Claude/claude_desktop_config.json{
"mcpServers": {
"layermap": {
"command": "npx",
"args": [
"-y",
"layermap"
]
}
}
}
Settings → Developer → Edit Config, merge this into mcpServers, then fully quit and reopen Claude Desktop.
Install not yet sandbox-tested— we haven't run this command through our automated sandbox yet. Not a red flag; we're working through the catalog.
Overview
Use cases
- Trace a function's callers up to its HTTP endpoints
- Inspect the callees and usages of a symbol
- Check which routes and jobs an uncommitted change affects
- Find existing tests related to changed code
- Navigate compiler-resolved relationships across supported languages
Key features
- Caller and callee tracing up to eight levels
- HTTP route, handler, job, and command impact paths
- Compiler-resolved links for five programming languages
- Module, declaration, and symbol usage inspection
- Uncommitted change impact checks
- Local read-only operation
How LayerMap works
Security & health
What it can reach and how reliably it runs — from our own checks, not the maintainer’s claims.
ActiveLast checked 3d ago
Recent health check succeeded.
Supply-chain signal
No high-severity advisories surfaced by our automated scan.
Critical 0High 0Medium 0Low 0
Scanned 6d ago via OSV.dev · layermap (npm)
Adoption & maintenance
Factual signals from GitHub, npm, and our automated checks — not a rating.
GitHub stars6Stargazers on the source repository.
npm downloads3.5kPackage downloads in the last 30 days.
Last commit4d agoMost recent push to the default branch.
Reviews
No reviews yet — be the first to share how it worked for you.
Frequently Asked Questions about LayerMap
LayerMap is an MCP server that connects coding agents to a local, read-only map of TypeScript, JavaScript, Go, Python, and Java repositories. Its main tools trace callers, callees, declarations, usages, HTTP routes, jobs, commands, and the impact of uncommitted changes, including related existing tests.
Install it through the integration documented for your agent. Claude Code and Codex use LayerMap marketplace and plugin commands, Pi installs `npm:layermap`, and DeepSeek Harness runs `npx layermap setup dsh`. Start a new session inside a Git repository after installation.
LayerMap supports TypeScript, JavaScript, Go, Python, and Java. It uses each language's compiler or type checker to resolve calls, including relationships involving interfaces, base classes, templates, and decorators when the language tooling can establish them.
LayerMap examines uncommitted changes and reports the routes, jobs, and commands reached by changed functions. It also identifies areas the map cannot see and existing related tests, grouping affected packages or modules with their tests when applicable.
No. LayerMap runs locally and the README states that it sends nothing. Its documented MCP capabilities are read-only, and the repository is mapped on the machine where the agent session runs.
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