# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when
working with code in this repository.

## Purpose

`seed-mcp` is an MCP server over the **public catalogs of major US
row-crop seed vendors** (corn / soybeans / wheat). It is the sibling
project to [`crop-chem-docs`](https://git.jpaul.io/justin/crop-chem-docs)
— same MCP-template lineage, same Drawbar consumer (the farm
advisor AI), but the corpus is **seed/hybrid varieties** rather than
pesticide labels.

The MCP exposes per-variety records with agronomic ratings, disease
tolerance, trait stack, maturity, and regional notes — so the advisor
can answer "which corn hybrid for sandy soil, drought-prone, RM ≤105
in northeast Iowa?" without rummaging through individual brand sites.

PRODUCT_NAME for this build: **`crop_seed`** (lowercase, underscore;
ends up in the MCP server name, Chroma collection, BM25 db filename,
and the `crop_seed_api_lessons` tool).

## Vendor scope

| Vendor | Verdict | Varieties | Source pattern |
|---|---|---|---|
| Bayer (DEKALB + Asgrow + WestBred) | 🟢 | ~475 | `cropscience.bayer.us` Next.js `__NEXT_DATA__` (same infra as crop-chem-docs) |
| Golden Harvest (Syngenta) | 🟢 | ~175 | sitemap.xml + server-rendered HTML + Syngenta CDN PDFs |
| NK (Syngenta) | 🟢 | 29 | static HTML + Syngenta CDN PDFs (shares fetcher with Golden Harvest) |
| AgriPro (Syngenta wheat) | 🟢 | 24 | Drupal Views form, server-rendered HTML |
| Beck's PFR | 🟡 | 2,089 | Public Sanity GROQ API at `mc8v24rf.api.sanity.io` (no auth) |
| Beck's products | 🟡 | 860 | Same Sanity API — identity-only until SeedIQ XHR is sniffed |
| Pioneer (Corteva) | 🔴 | — | DROP. ToS bans automation; dealer locator login-gated too |

**Build priority order** (shared-infra first → biggest yield):
1. `bayer_seeds` — lift-and-shift from crop-chem-docs' Bayer scraper
2. `golden_harvest` — biggest unique Syngenta brand
3. `nk` — reuses Golden Harvest's PDF fetcher
4. `agripro` — only wheat coverage in the corpus
5. `becks_pfr` — research goldmine, public Sanity GROQ
6. `becks_products` — identity-only, deferred until SeedIQ XHR known

### Pioneer fallback

Per user direction (2026-05-25), seed-mcp does NOT scrape Pioneer.
The MCP's lessons layer contains a Pioneer-fallback entry: when the
LLM detects a Pioneer / P-series query, it should reply:

> "Pioneer does not allow AI or other automation techniques to
> scrape and index their data. For Pioneer brand seed information,
> reach out to a local dealer directly via
> [pioneer.com](https://www.pioneer.com)."

Pioneer's dealer locator is login-gated — there is no public API
to surface dealer contact info, so the lesson stays a plain link.

## Schema notes per crop

- **Corn**: RM (relative maturity days), trait stack (SmartStax, VT
  Double PRO, Enlist, PowerCore, Trecepta, etc.), GLS / NCLB /
  Goss's / Anthracnose / Tar Spot ratings, standability, drought
  tolerance, ear flex, grain-vs-silage flag.
- **Soy**: Maturity group (e.g. 3.4), trait stack (XF / Xtend / E3 /
  LL+GT27 / RR2Y / Conkesta), SDS / white mold / SCN / Phytophthora
  (race + Rps gene) / frogeye / brown stem rot ratings, IDC
  tolerance (critical for upper Midwest), branching habit.
- **Wheat**: Class (HRW / HRS / SRW / SWW / SWS / durum), heading
  (early / medium / late), stripe rust / leaf rust / stem rust /
  FHB (scab) / Septoria / tan spot ratings, test weight, protein,
  falling number, straw strength, CoAXium trait flag.

**Disease scale gotcha**: Golden Harvest publishes ratings on a
**9-to-1 scale** (9 = best, 1 = worst) — the REVERSE of the typical
1-9 convention used by Bayer/NK/AgriPro. Normalize at chunk time so
the corpus has a single direction; document it in a chunk_0
preamble.

## Canonical sidecar schema (per variety)

```json
{
  "source": "bayer_seeds",
  "source_key": "dekalb-dkc62-08rib",
  "vendor": "Bayer",
  "brand": "DEKALB",
  "product_name": "DKC62-08RIB",
  "crop": "corn",
  "relative_maturity": 112,
  "maturity_group": null,
  "wheat_class": null,
  "trait_stack": ["SmartStax", "RIB"],
  "agronomic_ratings": {"standability": 7, "drought_tolerance": 6},
  "disease_ratings": {"GLS": 6, "NCLB": 7, "Goss_wilt": 5},
  "regional_recommendation": ["IA-N", "MN-S", "WI-W"],
  "source_urls": ["https://cropscience.bayer.us/..."],
  "fetched_at": "2026-05-25T12:34:56Z"
}
```

`maturity_group` is for soy, `relative_maturity` is for corn,
`wheat_class` is for wheat. Use `null` for fields that don't apply.
Disease/agronomic rating direction is **normalized 1-9 (9 = best)**
post-scrape — original direction noted in chunk_0 if the source
publishes differently.

## Working with this repo

### Identifying the current phase

This is a clone of the docs-mcp-template; phases follow the
template's PLAN.md.

| Signal | Likely phase |
|---|---|
| `corpus/` doesn't exist | Phase 1 (first scraper) |
| `corpus/bayer_seeds/` exists, no `chroma/` | Phase 2 (indexing) |
| `chroma/` exists, no `bm25/` | Phase 8 (hybrid search) |
| No `eval/results/` | Phase 7 (eval harness) |
| `_api_lessons` is `NotImplementedError` | Phase 11 |

## Layout

```
.
├── PLAN.md
├── README.md
├── CLAUDE.md
├── sources.json                  # Vendor catalog (corn/soy/wheat by source)
├── requirements.txt
├── Dockerfile
├── deploy/
│   └── docker-compose.yml
├── .gitea/workflows/
│   ├── refresh.yml               # Monthly cron: scrape + index + image
│   └── image-only.yml            # On-demand: code-only ship cycle
├── scrape/
│   ├── runner.py                 # `python -m scrape.runner --source bayer_seeds`
│   ├── changelog.py
│   └── sources/
│       ├── bayer_seeds.py
│       ├── golden_harvest.py
│       ├── nk.py
│       ├── agripro.py
│       ├── becks_pfr.py
│       └── becks_products.py
├── rag/                          # chunk + embed + Chroma + BM25
├── docs_mcp/                     # FastMCP server + lessons.md
├── eval/                         # Golden-query harness
└── scripts/                      # registry_gc.py, usage_report.py
```

## Conventions

- **Vendor sub-corpora**: each scraper writes
  `corpus/<source>/<source_key>.{md,json}`. `.md` is the LLM-visible
  text (chunk_0 preamble + body); `.json` is the sidecar metadata.
- **Tool docstrings are user interface** — the LLM uses them to
  decide whether to call. Treat like button labels.
- **Defensive fallback for retrieval** — reranker/BM25/external
  deps must catch their specific exception and degrade to baseline.
  The MCP is in front of farmers making real seed-buying decisions.
- **Verify retrieval changes with eval/** — ship a retrieval change
  with numbers in the commit message.

### Standard infrastructure choices

- **Embedding**: `nomic-embed-text` via Ollama (768-dim)
- **Reranker**: `jina-reranker-v2-base` GGUF via llama.cpp
  `/v1/rerank` (shared `llama-rerank` sidecar with crop-chem-docs
  on trashpanda Tesla P4)
- **Vector store**: Chroma `PersistentClient`
- **Lexical store**: SQLite FTS5
- **Fusion**: RRF k=60
- **Transport**: streamable-HTTP in prod, stdio for local dev
- **MCP framework**: FastMCP with `stateless_http=True`

### Image name and package linking are repo-name-derived

`IMAGE` and `--package` derive from the repo at runtime via
`${{ github.repository_owner }}` / `${{ github.event.repository.name }}`.
The only workflow placeholders customized per clone are
`REGISTRY_PUSH=192.168.0.2:1234`, `REGISTRY_PULL=git.jpaul.io`,
and the `OLLAMA_URL` embed pool.

## Common commands

```bash
# Dev environment
python -m venv venv && source venv/bin/activate
pip install -r requirements.txt

# Run one scraper
python -m scrape.runner --source bayer_seeds --force

# Rebuild indexes
python -m rag.index --rebuild

# Local MCP server
python -m docs_mcp.server --transport stdio
python -m docs_mcp.server --transport streamable-http --port 8000

# Eval
python -m eval.run_eval --queries eval/queries.jsonl --output eval/results/baseline.md
```

## Gotchas

- **`fetch-depth: 0` on `actions/checkout@v4`** in both workflows.
- **Reranker per-pair token limit**: jina-reranker GGUF rejects the
  ENTIRE batch if any doc exceeds `n_ctx_train=1024`. Truncate
  reranked docs to ~2000 chars.
- **FastMCP `stateless_http=True`**: critical for prod.
- **Runner shell is `/bin/sh` (dash)** in CI — no `${VAR::N}`.
- **Cloudflare 100 MB body cap**: push via LAN endpoint
  `192.168.0.2:1234`, pull via `git.jpaul.io`.
- **Golden Harvest disease scale is reversed (9 = best)** —
  normalize at chunk time.
- **Sitemap-listed PDF dates on Golden Harvest are stale** —
  resolve the live PDF URL from the product HTML page.
- **No IPv6** — DNS for git.jpaul.io returns IPv6-only. Clone via
  HTTPS, not SSH (port 22 returns Network unreachable).
- **Pioneer is OFF-LIMITS** — do NOT add a `pioneer.py` scraper.

## Out-of-scope concerns

- **Reverse proxy / TLS** — Drawbar's compose handles it
- **MetaMCP** — separate aggregator
- **GPU container orchestration** — shared `llama-rerank` sidecar
- **University extension trial data** — deferred to v1.5