Harvest MCP Server

harvest-mcp

Plain-English topic in → 12 experts fan out over Hugging Face + GitHub in parallel → coverage-scored training pack JSON out in ~30 seconds.

No API keys. No Bridge. No account. Works out of the box once connected to any MCP host — no LLM inside; your agent brings the thinking.

Harvest is a training-data scout: you describe what you want to train on in plain English ("image classification", "medical question answering"), and 12 domain experts — code, math, science, language, vision, audio, medical, law, knowledge, safety, affect, systems — each sweep Hugging Face datasets and GitHub repos with their own curated queries. The local mixer then composes the hits into a balanced, coverage-scored training library pack (flare-harvest-library v1 JSON) you can hand to any training pipeline.

Install

npx github:The-Warl0ck/harvest-mcp

Or add it to Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "harvest": {
      "command": "npx",
      "args": ["github:The-Warl0ck/harvest-mcp"]
    }
  }
}

With optional tokens for higher rate limits:

{
  "mcpServers": {
    "harvest": {
      "command": "npx",
      "args": ["github:The-Warl0ck/harvest-mcp"],
      "env": {
        "HF_TOKEN": "hf_...",
        "GITHUB_TOKEN": "ghp_..."
      }
    }
  }
}

Requirements: Node.js ≥ 20.

Example session

You: find me training data for a small vision-language model

harvest.search { "topic": "vision language instruction tuning" } → ~40 hits: LLaVA-NeXT data, the Cauldron, DOCCI, LLaVA repo… plus the 12-expert atlas sweep for breadth (code, math, safety…)

harvest.compose { "goal": "small vision-language model", "catalog": […] } → { "title": "small vision-language model", "picks": [ { "id": "lmms-lab/LLaVA-NeXT-Data", "expert": "vision", "why": "Anchor Vision on Hugging Face" }, … ], "rationale": "Local mixer staged 22 items across 12/12 experts. No mouth required.", "engine": "local" }

harvest.pack { "goal": "small vision-language model", "name": "VLM Mix v1", "catalog": […] } → flare-harvest-library v1 JSON with coverage: { filled: 12, totalExperts: 12, balance: 0.94 } and per-item ingest: { type: "hf-dataset" | "github-repo", ref } pointers.

The second half — the hands. Packs start as pointers; pull turns them into files:

harvest.resolve { "item": { "id": "openai/gsm8k", "source": "huggingface" } } → the loot preview: 4 parquet shards + README, each with a one-line reason, nothing stupid

harvest.pull { "pack": {…}, "destination": "download" } → resolves + fetches every item, updates the pack's index stanza, and builds VLM Mix v1.harvest.zip — one file with everything plus MANIFEST.json provenance

harvest.push { "bundle": "/path/to/VLM Mix v1.harvest.zip", "owner": "you", "repo": "my-data", "token": "ghp_…", "create_if_missing": true } → one commit on a new private repo: files + manifest, message says what it is and where it came from

The same loop works for code. Second session — the build pack:

You: I want the rate-limiting code from a few good repos, packaged so my agent can build with it

harvest.search { "topic": "express rate limiting middleware" } → the code expert surfaces the repos with the parts you want

harvest.pack { "goal": "add rate-limiting to my API", "name": "Rate Limit Parts v1", "catalog": […], "purpose": "code" } → flare-harvest-codepack v1 JSON — same item envelope, no training-coverage scoring

harvest.pull { "pack": {…}, "destination": "download", "kinds": ["code", "docs"] } → pulls just the source files (skips weights/datasets), builds the .harvest.zip

harvest.push { "bundle": "…", "owner": "you", "repo": "rate-limit-parts", "create_if_missing": true } → your agent pulls the repo and builds from the parts

Tools

catalog items are { id, source, expert, description? } — the objects harvest.search returns drop straight in.

Rate limits

Everything hits the public Hugging Face and GitHub APIs. Unauthenticated, you get:

• Hugging Face: generous anonymous quota on /api/datasets (occasional 429s on bursts; results are cached 12 min in-process)
• GitHub: 60 requests/hour per IP for search — the 12-expert sweep is the hungriest call

For real use, set HF_TOKEN / GITHUB_TOKEN (free accounts) via env or the per-call hf_token / gh_token args. See .env.example.

Pack format

Packs are flare-harvest-library v1 JSON — see PACK-FORMAT.md.

Pointer vs. pulled

A fresh pack is pointers, not data: each item names its source and how to ingest it, but no files. harvest.pull turns pointers into files and records the result in an additive index stanza on the pack JSON:

{ "index": { "openai/gsm8k": { "local": "/tmp/harvest-pulls/pack/openai__gsm8k",
  "url": "https://huggingface.co/datasets/openai/gsm8k", "kind": "dataset",
  "license": null, "fetched_at": "2026-09-26T…", "files": ["main/train-….parquet", …] } } }

v1 readers ignore the stanza safely; packs without it load as pointer-only. destination: "download" additionally produces a .harvest.zip containing the files plus MANIFEST.json (source, URL, license, SHA-256 per file — licenses are reported as unknown when the pack doesn't state one, never guessed).

Token story

Tokens are passed per call, never stored:

• harvest.search / harvest.expert / harvest.latest / harvest.resolve / harvest.pull accept hf_token / gh_token (or the HF_TOKEN / GITHUB_TOKEN env vars) — used for higher rate limits and gated datasets, sent only as an Authorization header.
• harvest.push takes a per-call token (GitHub PAT, or GITHUB_TOKEN env).
• No token is ever written to disk, to logs, to a pack file, or to a manifest. Fetch resume ledgers (.harvest-fetch.json) hold only paths, byte counts, and hashes.

How it works

• src/harvest/scan-core.ts — parallel HF/GitHub scanning, 12-min result cache
• src/experts.ts — the 12-expert atlas (curated queries + seed items)
• src/harvest/compose-local.ts — the local mixer ("No mouth required"): anchors one item per expert, then balances HF/GitHub sources, then fills for coverage
• src/coverage.ts — entropy-based coverage/balance scoring across the 12 experts
• src/harvest/compose-mouth.ts — opt-in: compose via any OpenAI-compatible /v1 endpoint (LM Studio, etc.) instead of the local mixer
• src/harvest/resolve.ts — the "which files" intelligence: HF Hub / GitHub tree listings classified into data, weights, config, code, docs (pure functions + thin API clients)
• src/harvest/fetch.ts — the hands: streaming downloads with resume, size guards, progress, SHA-256 per file; token arrives as a function arg, never stored
• src/harvest/bundle.ts — zips a fetched dir + MANIFEST.json provenance into a .harvest.zip
• src/harvest/push.ts — pushes a bundle to GitHub via the Git Data API: one commit, private by default (// TODO(GitLab) seam sketched)
• src/harvest/index.ts — the agent side: additive index stanza + resolvePointer / getItemFiles / queryIndex
• mcp/server.ts — the MCP server (stdio, low-level SDK API, hand-written schemas)

License

Apache-2.0 — see LICENSE.