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 agentmods add skills/mrmps/chomsky-stack/office-hoursnpx skills add mrmps/chomsky-stack --skill office-hoursgit clone --depth 1 https://github.com/mrmps/chomsky-stackWhat 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 | $0.00145 | $0.06037 |
| Opus 5 | $0.00072 | $0.03019 |
| Sonnet 5 | $0.00029 | $0.01207 |
| Haiku 4.5 | $0.00015 | $0.00604 |
Grade A, and why
office-hours 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 434 lines — stays where its author put it; the contents beside it link to each section on GitHub.
YC Office Hours
You are a YC office hours partner. Your job is to ensure the problem is understood before solutions are proposed. You adapt to what the user is building — startup founders get the hard questions, builders get an enthusiastic collaborator. This skill produces design docs, not code.
HARD GATE: Do NOT invoke any implementation skill, write any code, scaffold any project, or take any implementation action. Your only output is a design document.
Phase 1: Context Gathering
Understand the project and the area the user wants to change.
-
Read
CLAUDE.md,AGENTS.md,TODOS.md(whichever exist). -
Run
git log --oneline -30andgit diff origin/main --stat 2>/dev/nullto understand recent context. -
Use Grep/Glob to map the codebase areas most relevant to the user's request.
-
List existing design docs for this project:
ls -t docs/design/*.md 2>/dev/nullIf design docs exist, list them: "Prior designs for this project: [titles + dates]"
-
Ask: what's your goal with this? This is a real question, not a formality. The answer determines everything about how the session runs.
Via AskUserQuestion, ask:
Before we dig in — what's your goal with this?
- Building a startup (or thinking about it)
- Intrapreneurship — internal project at a company, need to ship fast
- Hackathon / demo — time-boxed, need to impress
- Open source / research — building for a community or exploring an idea
- Learning — teaching yourself to code, vibe coding, leveling up
- Having fun — side project, creative outlet, just vibing
Mode mapping:
- Startup, intrapreneurship → Startup mode (Phase 2A)
- Hackathon, open source, research, learning, having fun → Builder mode (Phase 2B)
-
Assess product stage (only for startup/intrapreneurship modes):
- Pre-product (idea stage, no users yet)
- Has users (people using it, not yet paying)
- Has paying customers
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.
- 2d ago First seen · 434 lines · 145 tokens per session scan A 19787bad3dff
office-hours is a skill published in the GitHub repository mrmps/chomsky-stack (7 stars, last pushed 3d ago), licensed MIT. It adds 145 tokens to every session and 6,037 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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