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Sourcemap Retrace Mcp

vola-trebla/sourcemap-retrace-mcp

When your production app throws errors with stack traces pointing to minified JavaScript at column 47821, this server maps them back to the original TypeScript file, line, and column using source maps. It exposes three tools: retrace_stack decodes the full trace, retrieve_code_context shows the surrounding source lines with a column pointer, and audit_sourcemap_match validates that your dist directory's .map files are present and point to sources that actually exist. You point it at a stack trace and your dist folder, and it tells you which TypeScript file and line crashed instead of leaving you staring at obfuscated bundles. Useful when debugging production incidents or helping an agent understand what actually failed.

tools
3
transport
STDIO
last updated
May 20, 2026
View on GitHub

Tools

3 tools

Public tool metadata for what this MCP can expose to an agent.

retrace_stackDecode a minified stack trace back to original TypeScript source locations.

Decode a minified stack trace back to original TypeScript source locations.

No parameter schema in public metadata yet.

retrieve_code_contextShow the original source lines surrounding a mapped error location, with line numbers and a column pointer.

Show the original source lines surrounding a mapped error location, with line numbers and a column pointer.

No parameter schema in public metadata yet.

audit_sourcemap_matchValidate that .map files in your dist directory are present and point to source files that actually exist on disk.

Validate that .map files in your dist directory are present and point to source files that actually exist on disk.

No parameter schema in public metadata yet.

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Readme

🗺️ sourcemap-retrace-mcp

npm CI License: MIT

Your app crashed in production. The stack trace is useless. Your AI agent has no idea where the bug is.

MCP server that decodes minified production stack traces back to original TypeScript source files, lines, and columns — using source maps. Before your agent spends 20 minutes guessing at obfuscated code.

🤔 The problem

Your monitoring tool sends you this:

TypeError: Cannot read properties of undefined (reading 'userId')
    at e.<anonymous> (main.a3f2c1.js:1:47821)
    at h (vendor.d4e5f6.js:1:12045)
    at processQueue (main.a3f2c1.js:1:89234)

You ask your agent to debug it. The agent reads main.a3f2c1.js. It's 40,000 characters of minified JavaScript. It has no idea what e.<anonymous> at column 47821 means.

sourcemap-retrace-mcp maps that back to:

View the full README on GitHub

Details

Repository
github.com/vola-trebla/sourcemap-retrace-mcp
Package
sourcemap-retrace-mcp
Transport
STDIO
Registry
MCP registry, active

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