Jlc Part Search

JLC Part Search

Use this skill to query 嘉立创/LCSC component availability and return verifiable part facts. The default source is domestic, which uses SZLCSC domestic public catalog data first and emits RMB/CNY price fields when present. This skill is intentionally split into two mandatory stages so Codex does not confuse "found in the catalog" with "suitable for the design".

Mandatory Workflow

1. Run filter for broad user requirements.
2. Present the ranked candidates and their evidence gaps.
3. Only after a specific Cxxxxxx LCSC code or exact MPN is chosen, run detail or enet.

Catalog availability is not design validation. If a requirement is not directly supported by returned catalog parameters, product text, or datasheet metadata, mark it as unverified.

Commands

Run the bundled CLI with uv run:

uv run python ~/.codex/skills/jlc-part-search/scripts/jlc_parts.py filter "10k 1% 0402 resistor"
uv run python ~/.codex/skills/jlc-part-search/scripts/jlc_parts.py detail C25804
uv run python ~/.codex/skills/jlc-part-search/scripts/jlc_parts.py enet C25804
uv run python ~/.codex/skills/jlc-part-search/scripts/jlc_parts.py datasheet C25804 --output-dir ./datasheets

The CLI defaults to --source domestic. Use --source auto only when domestic sources are insufficient and overseas/public fallback behavior is explicitly acceptable.

filter is stage 1. It searches the catalog and returns possible candidates only:

• never returns selected
• never returns final enet_fields
• never claims a candidate satisfies the design
• never treats no catalog result as proof that the design is impossible

detail is stage 2. It fetches facts for one explicit LCSC code or exact MPN:

• does not perform broad requirement search
• does not switch to another candidate automatically
• returns product URL, datasheet PDF URL, stock/library hints, RMB/CNY price tiers when available, parameters, and EasyEDA metadata when available

enet is stage 2 formatting for one explicit part. It returns ENET-compatible fields only; it does not create, patch, or overwrite .enet files.

datasheet is a stage 2 download command for one explicit LCSC code or exact MPN:

• does not perform broad requirement search
• does not switch to another candidate automatically
• downloads only the resolved part's datasheet_pdf
• defaults to ./datasheets and returns the written PDF path in JSON
• does not modify catalog data, .enet files, or user design files

Output Contract

filter returns JSON with:

• stage: "filter"
• status: candidates, no_catalog_match, or no_verified_candidates
• query
• inferred required_constraints and preferred_constraints
• candidates[] with lcsc, mpn, manufacturer, package, stock, price_currency, price_tiers, min_order_qty, unit, library_type, URLs, score, matched/uncertain/failed constraints
• next_required_action: "run_detail_for_one_candidate"

detail returns JSON with:

• stage: "detail"
• status: detail, ambiguous_identifier, or no_catalog_match
• one explicit part's facts when unique
• no final enet_fields

enet returns JSON with:

• stage: "enet"
• status: "enet_fields" when unique
• selected part summary
• enet_fields: LCSC, MPN, Manufacturer, Package, footprintName, footprintUuid
• evidence: product and datasheet URLs

datasheet returns JSON with:

• stage: "datasheet"
• status: downloaded, exists, no_datasheet, no_catalog_match, ambiguous_identifier, invalid_datasheet_url, download_failed, or not_pdf
• selected part summary when a unique part resolves
• datasheet_pdf, file_path, bytes, and content_type when available

Read references/api-notes.md before changing API behavior. Read references/output-schema.md before changing JSON field names.

Validation

After changing this skill, run:

uv run python ~/.codex/skills/.system/skill-creator/scripts/quick_validate.py ~/.codex/skills/jlc-part-search
uv run python ~/.codex/skills/jlc-part-search/scripts/jlc_parts.py self-test

Use live filter, detail, and enet commands only when network access is available.