Evidence Diff is a local MCP tool for explaining coarse changes in a Git project’s test and build evidence. It can tell an agent that a worktree changed, that uncommitted evidence exists, or that test-like artifacts appear without build-like artifacts, without exposing source diffs.

Tool

explain_change_evidence: inspect local Git state and bounded top-level evidence names.

Safety

Local paths only, bounded by EVIDENCE_DIFF_ROOT and realpath checks.
Returns only counts, coarse categories, coarse branch state, and commit dates.
Never returns source diffs, evidence filenames, branch names, file paths from Git output, commit subjects, authors, command output, file contents, or secrets.
Does not execute tests, builds, or arbitrary project commands.
This is an evidence explanation aid, not a code review or CI oracle.

Run

npm install
npm run build
node dist/index.js

Quick start

npm install
npm run build
node dist/index.js

The server uses stdio, so it can be connected to Claude Desktop, Cursor, VS Code, MCP Inspector, or another compatible MCP client.

Tools at a glance

explain_change_evidence: Explain coarse changes in local Git and test-build evidence without returning source diffs, file contents, or secrets.

Try it

After building, connect the server through your MCP client. The repository root also contains smoke-test.mjs for projects covered by the shared harness. A typical tool call starts with explain_change_evidence.

Premium tools

These tools need a license key:

commit_history_evidence

Buy a key at https://mcp-marketplace.io/server/io-github-mrfentmen-evidence-diff-mcp and set it in your MCP client config:

"env": { "MCP_LICENSE_KEY": "mcp_live_..." }

The key is checked against MCP Marketplace, cached for 24 hours, and keeps working offline once one check has succeeded. Every other tool on this server stays free.