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yc-reader

Look up Y Combinator companies, batches, and startup ecosystem data using the yc-oss API (read-only). Use this skill whenever the user wants to research YC-backed startups, find companies in a specific batch or industry, check which YC companies are hiring, explore top YC companies, or analyze startup trends by sector or tag. Triggers include: "YC companies in fintech", "who's in the latest YC batch", "YC startups hiring", "top Y Combinator companies", "find YC companies tagged AI", "W25 batch",

3,162stars366forksUpdated 8/14/2026

Security Assessment

Safe(95/100)
Security Score95/100

About yc-reader

This skill is a read-only research helper for Y Combinator company and ecosystem data, backed by the unofficial open-source yc-oss API (a static JSON dataset sourced from YC's Algolia index and refreshed daily via GitHub Actions). It solves the problem of quickly researching YC-backed startups, batches, industries, tags, hiring status, and diversity data without any authentication or write access, since the API only serves static JSON files.

The workflow is straightforward and safe: verify that curl and jq are available (with install hints if jq is missing), match the user's request to the right endpoint (meta.json for stats, companies/all.json, top.json, hiring.json, nonprofit.json, diversity files, per-batch and per-company files, industry and tag files), then fetch and filter with curl and jq. It documents batch and industry naming conventions, a set of common jq filter recipes, guidance to avoid the large all-companies endpoint when a narrower one exists, presentation tips for research output, and a diagnostics table for 404s, empty arrays, and network errors. All operations are simple HTTP GETs against a public GitHub Pages host followed by local JSON filtering.

Target users are founders, investors, analysts, and researchers doing startup and venture research, market intelligence, or portfolio analysis. Typical use cases include finding companies in a batch or industry, identifying which YC companies are hiring, exploring top companies, searching by tag such as AI or developer-tools, and computing aggregate statistics across the dataset.

FAQ

Does this skill require any credentials?

No. The yc-oss API is public and free with no authentication; the skill fetches static JSON endpoints with curl over HTTPS.

What tools do I need installed?

Only curl to fetch data and jq to parse and filter JSON, both typically pre-installed. The skill checks for them and provides install hints for jq (brew or apt-get) if it is missing.

Can it modify YC data?

No. It is explicitly read-only; the API serves static JSON files and has no write operations. It only reads company profiles, batch listings, industry and tag breakdowns, hiring status, and diversity data.

How do I query a specific batch or industry?

Batches use a season-year format like winter-2026 or fall-2025 (short forms like w09 also work per company), and industries and tags use lowercase hyphenated names like developer-tools or machine-learning, fetched from the corresponding JSON endpoint.

How fresh is the data?

The underlying yc-oss dataset is sourced from YC's Algolia search index and updated daily via GitHub Actions, so results are near-real-time but not live.

All Files

3 files
SKILL.md7.3 KB
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README.md2.0 KB
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references/api_reference.md9.9 KB
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Install yc-reader

Download and extract the skill files to your .claude/skills/ directory.

Quick Setup:

  1. Copy the skill folder to .claude/skills/
  2. Claude will automatically detect and use the skill