Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add gabrielmoreira/agent-skills-mirror --skill yc-advisorgit clone --depth 1 https://github.com/gabrielmoreira/agent-skills-mirrorWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/gabrielmoreira/agent-skills-mirror/yc-advisor)<a href="https://agentmods.dev/skills/gabrielmoreira/agent-skills-mirror/yc-advisor"><img src="https://agentmods.dev/badge/skills/gabrielmoreira/agent-skills-mirror/yc-advisor/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/gabrielmoreira/agent-skills-mirror/yc-advisor"><img src="https://agentmods.dev/badge/skills/gabrielmoreira/agent-skills-mirror/yc-advisor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00082 | $0.01428 |
| Opus 5.5 | $0.00033 | $0.00571 |
| Sonnet 5.5 | $0.00016 | $0.00286 |
| Haiku 4.5 | $0.00008 | $0.00143 |
Grade A, and why
yc-advisor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to yc-advisor — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.
YC Advisor
Overview
This skill provides access to Y Combinator's comprehensive library of 443 startup resources - essays, podcast transcripts, and video transcripts from YC partners, successful founders, and industry experts.
How to Use This Skill (Tiered Retrieval)
Key Principle: Use quick-index for discovery, but ALWAYS load full source content before answering.
Step 1: Understand Context (for broad questions)
For broad questions, clarify the user's context:
- Stage: Pre-idea | Idea | Building MVP | Launched | Scaling
- Type: B2B | Consumer | Hardware | AI/ML | Marketplace
- Role: Technical founder | Non-technical | Solo | With co-founder(s)
Step 2: Discovery
- Load
references/quick-index.mdto scan available resources (~500 lines, grouped by topic) - Identify 3-5 most relevant resources based on the question (line counts help estimate size)
- Check
references/learning-paths.mdif user is on a founder journey - Check
references/frameworks/for decision questions - use globreferences/frameworks/*.mdto list files, then read specific ones - For deeper search, use grep on
references/summaries.md(too large to load fully)
Step 3: Deep Dive
- Find files using the code - use glob pattern
references/{CODE}-*.md- Example: For code
DZ, use globreferences/DZ-*.mdto find the file - WARNING: NEVER read
index.yaml- it exceeds token limits (64K tokens)
- Example: For code
- Load the FULL content of top 2-3 resources
- Read completely - do not skim
- Extract key insights, quotes, and actionable advice
Step 4: Synthesize Answer
- Combine insights from multiple sources
- Quote directly from source material when valuable
- Always cite author and title for each point
- Acknowledge tradeoffs and contradictions between sources
- Never answer from summaries alone - always load full source content
Topic Categories
The library covers these main areas (use for initial filtering):
- Getting Started: Should you start? Startup ideas, order of operations, student founders
- Co-founders: Finding, relationships, equity splitting, technical vs non-technical
- Product: MVP, product-market fit, design, building for users
- Fundraising: Seed, Series A, investor pitching, SAFEs, term sheets
- Growth & Metrics: Growth strategies, KPIs, conversion, retention
- Customers & Sales: Talking to users, first customers, pricing, enterprise sales
- Hiring & Team: First hires, engineering teams, equity, management
- Culture & Leadership: Building culture, CEO evolution, board management
- Common Mistakes: Startup killers, financial health, when to quit
- Pivoting & Launching: Pivot strategies, launch timing, press
- Scaling: Later stage advice, unicorn characteristics
- Mindset: Resourcefulness, handling rejection, goal setting
- AI Startups: AI opportunity, moats, vertical agents, vibe coding
- Founder Interviews: Airbnb, Stripe, Coinbase, Reddit, Twitch, DoorDash
- Specialized: Hardware, biotech, dev tools, crypto, location
- Joining Startups: Choosing a startup, stages, equity
- YC Application: Application tips, process, YC effect
- Legal: Startup mechanics, terms, agreements
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 151 lines · 82 tokens per session scan A 0189b1d25b21
yc-advisor is a skill published in the GitHub repository gabrielmoreira/agent-skills-mirror (19 stars, last pushed today), licensed MIT. It adds 82 tokens to every session and 1,428 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to yc-advisor, differing in 0 lines, and is treated as a copy.
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