Fixmap MCP Server

Deterministic repo context for coding agents: ranked files with reasons, test routes, risk notes. Exposed over MCP by the fixmap mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.

What it actually does

Paste a GitHub issue URL, describe a task, or point at a diff. FixMap returns ranked context files, test routes, risk notes, and explainable diagnostics—without an account, API key, or model call.

Its toolset

Everything the assistant can do here goes through one of these:

• uses — actions/checkout@v7
• run — echo '${{ steps.plan.outputs.report }}' > fixmap-plan.json
• Deterministic — ** the same task, repository, and diff produce the same ranking—there is no hidden model call
• Explainable — ** every ranked file includes reasons such as path matches, content matches, exact definitions, changed-file evidence, or import proximity
• Local-first — ** local repositories stay local; public URLs use an anonymous temporary checkout
• Non-executing — ** FixMap never installs dependencies or runs repository build, test, hook, or package scripts
• Git-aware — ** scans respect .gitignore; working-tree mode reports staged and unstaged tracked files as changed, adding untracked ones only when
• Monorepo-aware — ** test routing understands npm, pnpm, Yarn, Bun, and workspace package boundaries
• Bounded — ** file counts, text samples, issue bodies, network responses, and remote-fetch time are capped with explicit diagnostics
• Output — What it tells you
• Diagnostics — Missing refs, scan limits, remote-fetch details, and other uncertainty

Adding it to your client

Being a remote server, there is no local install. You register the endpoint with your client, authorise it once, and the tools appear.

Configuration

You will need one environment variable: GITHUB_TOKEN. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.

When to reach for it

Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Fixmap's toolset — uses, run, Deterministic and 8 more — is a fair guide to whether it matches your workflow. It is maintained by aryamthecodebreaker; worth a glance at recent repository activity before you build anything load-bearing on it.

This entry was verified against Fixmap's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.

Caveats

• Your data travels to the provider's service, so the usual questions apply about what you send and what they retain.
• With 11 tools registered it takes up a noticeable share of the context window; turn it off in projects that never touch Fixmap.
• Missing credentials fail quietly in some clients — if no tools show up, check the environment block first.
• MCP clients confirm each tool call by default. Leave that on until you have watched what the fixmap mcp server does with a few real requests.