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Self-hosted Jev MCP on Cloudflare Workers with intent routing, retrieval reranking and batch judgments
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Jev directory
CommunityJev Agents & MCP
Jev MCP for Cloudflare
A self-hosted MCP gateway on Cloudflare Workers that wraps the TypeSafe/Jev System One model into nine judgment tools for intent routing, retrieval reranking and batch semantic work, with a D1-backed admin console.
- Stars
- 1
- Language
- TypeScript
- License
- MIT
- Reading time
- 3 min
- Published by
- Community
- Author
- baize7815
- Last verified
- Oct 2026
- Languages
- TypeScript
- Platforms
- MCPCloudflareSQLite
- Capabilities
- Open sourceSelf-hostedRequires API key
Highlights
- Exposes nine tools over JSON-RPC at /mcp, including route_intent, rerank_candidates, batch_judge, verify_evidence and a raw system_one passthrough.
- Batch tools cap at 10 records, 128 KB input and concurrency 3; failed records are marked failed and never retried automatically, to avoid double billing.
- Runs on Cloudflare Workers with D1: TypeSafe API keys are AES-GCM encrypted at rest and rotated by cursor, with call outcomes and token usage written back.
- /mcp has no authentication by design, so the deployment URL should be treated as semi-public; only /admin requires an ADMIN_TOKEN.
- Ships a Codex Skill and 13 synthetic eval cases; eval:live runs against your real system_one endpoint and consumes credits.
Quickstart
bash
npm ci
cp wrangler.example.jsonc wrangler.jsonc
npx wrangler login
npx wrangler d1 create jev-mcp
npx wrangler d1 migrations apply jev-mcp --remoteWatch out
Grounded in the truncated repository README (primarily Chinese) and GitHub metadata reviewed on 2026-10-15; eval:check only validates the format of 13 synthetic cases, the README states the live eval is not a domain-accuracy guarantee, and setup needs Node.js 24.11+, a Cloudflare account and at least one TypeSafe API key.
Questions about this entry
Short answers drawn from the linked project or page.
It is a self-hosted MCP gateway on Cloudflare Workers that wraps the TypeSafe/Jev System One model (jev-latest) into nine tools served over standard MCP JSON-RPC at /mcp, aimed at tasks like intent routing, retrieval reranking and batch semantic judgments rather than prose generation.
route_intent, rerank_candidates, batch_judge, select_values, verify_evidence, evaluate_options, classify_hierarchy, decide_next_step and system_one. All returns are structured answers with confidence; decide_next_step returns an input fingerprint for cache invalidation without executing anything.
Run npm ci, copy wrangler.example.jsonc to wrangler.jsonc, log in with wrangler, create a D1 database, apply migrations remotely, set ADMIN_TOKEN and KEY_ENCRYPTION_SECRET with wrangler secret put, check with npm run types/typecheck/test/deploy:check, then npm run deploy. Add your TypeSafe key in /admin.
Batches hold at most 10 records and 128 KB of total input, with a server concurrency of 3. Records that fail judgment are marked failed rather than dropped as irrelevant, and the gateway does not retry automatically to avoid double billing.
No. The README states /mcp is intentionally unauthenticated: anyone who knows the deployment address can consume your TypeSafe quota. Only /admin needs the ADMIN_TOKEN, so treat the URL as semi-public or add access control on the Cloudflare side.
In Cloudflare D1, encrypted with AES-GCM using KEY_ENCRYPTION_SECRET, which must be 64 hex characters (32 bytes). The database only shows ciphertext and the last four digits, and losing or changing the secret makes stored keys undecryptable.
npm run eval:check validates the format of 13 synthetic cases only. npm run eval:live requires JEV_MCP_URL, runs the evaluation against that address's real system_one endpoint, consumes credits, and outputs exact-match results and confidence-threshold statistics; the README says it is not a domain-accuracy guarantee.
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