Evidrift MCP server

Evidrift — replay-verified JSON reductions and API drift evidence

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Failures arrive noisy. APIs drift quietly. Evidrift turns both into deterministic evidence.

Evidrift has two deliberately separate workflows:

• ReproMin repeatedly removes JSON data, replays each candidate against a disposable local HTTP target, and keeps only reductions that still match the selected failure identity.
• Contract drift records an exact TypeScript call signature or repository JSON value as a content-addressed Receipt, then makes CI recompute it before merge.

Local-first CLI. STDIO MCP server for contract recording only. No account, cloud backend, telemetry, or LLM judge.

The animation is rendered from a captured CLI transcript. The PASS, changed signatures, affected file, and deterministic FAIL come from an actual local evidrift demo run; only the scene headings are editorial.

Quick Start — Minimize a Failing Request

Requires Node.js 22 or newer. The zero-setup demo starts a disposable loopback server, verifies one HTTP failure, minimizes its JSON request, verifies the result again, and shuts the server down:

npx --yes evidrift@latest repro-demo

The result is not selected by an LLM. Every accepted reduction is actually replayed and must match both the expected HTTP status and error identity.

For your own local endpoint:

npx evidrift minimize \
  --request failing-request.json \
  --status 500 \
  --response-pointer /error/code \
  --response-equals '"INVALID_FILTER"' \
  --output minimal-repro.json \
  --confirm-replay yes

Then replay the content-addressed artifact once:

npx evidrift reproduce --artifact minimal-repro.json --confirm-replay yes

See the complete ReproMin fixture, guarantees, and replay safety boundary.

Quick Start — See Drift in One Command

Requires Node.js 22 or newer. Nothing to install globally:

npx --yes evidrift@latest demo

The command creates a disposable local fixture, records the optional options parameter on parseConfig, checks it successfully, changes the fixture so options is required, then proves that evidrift check catches the mismatch. It runs no downloaded package code.

If that is a failure you want caught before merge, star Evidrift on GitHub.

Real-world Lab — React 19 useRef

Shortened. The full README is on GitHub.