office-hours

A guided product-thinking session based on six questions for startups, or brainstorming support for builders working on side projects, hackathons, learning, or open source. It produces a design document rather than code.

In plain words
What is it for?
Use it to question a startup idea, find a focused first product, brainstorm a side project, plan a hackathon idea, or outline an open-source or learning project.
Why use it?
It helps clarify the problem before anyone starts building a solution. For startups, it tests whether the problem is urgent and specific; for builders, it helps shape an idea.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/gcwing/bitfun/gstack-office-hours
Any agent
npx skills add GCWing/BitFun --skill gstack-office-hours
Clone the repo
git clone --depth 1 https://github.com/GCWing/BitFun

Made for: Claude Code, Codex.

Per session 168 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 16,480 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 2 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00168 $0.16480
Opus 5 $0.00084 $0.08240
Sonnet 5 $0.00034 $0.03296
Haiku 4.5 $0.00017 $0.01648

Measured 2d ago against content hash 093a71d42ebd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

office-hours scanned grade B with 2 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.

Sends data to an external URLmediumData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

4. POST the new HTML to the running server via `curl -X POST http://localhost:PORT/api/reload -H 'Content-Type: application/json' -d '{"html":"$_DESIGN_DIR/design-board.html"}'`

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

4. POST the new HTML to the running server via `curl -X POST http://localhost:PORT/api/reload -H 'Content-Type: application/json' -d '{"html":"$_DESIGN_DIR/design-board.html"}'`
src/crates/assembly/core/builtin_skills/gstack-office-hours/SKILL.md · 1,218 lines

How it starts

The opening of the file, as written. The whole thing — 1,218 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.

BitFun Team Mode Dispatch

When this skill is invoked by BitFun Team Mode, treat this skill as the product-thinking methodology and use existing Task sub-agents only for independent discovery that improves the design doc.

  • Do not assume role-named sub-agents exist. Choose only from the Task tool's available agents.
  • Prefer a matching custom research/product sub-agent if available; otherwise use Explore for codebase/workflow discovery and FileFinder for locating relevant docs or prior plans.
  • Keep all final problem framing, tradeoff decisions, and design-doc writing in the main Team session.
  • Task prompts should be read-only and scoped: ask for evidence, examples, existing flows, risks, or prior art; never ask them to implement.
  • If no useful sub-agent exists, continue in the main Team session and say subagent: none suitable.

Phase 1: Context Gathering

Understand the project and the area the user wants to change.

SLUG=$(basename "$(git rev-parse --show-toplevel 2>/dev/null || pwd)" | tr -cd A-Za-z0-9._-)
  1. Read AGENTS.md, TODOS.md (if they exist).
  2. Run git log --oneline -30 and git diff origin/main --stat 2>/dev/null to understand recent context.
  3. Use Grep/Glob to map the codebase areas most relevant to the user's request.
  4. List existing design docs for this project:
    setopt +o nomatch 2>/dev/null || true  # zsh compat
    ls -t $HOME/.bitfun/team/projects/$SLUG/*-design-*.md 2>/dev/null
    
    If design docs exist, list them: "Prior designs for this project: [titles + dates]"

Read the full file on GitHub · 1,218 lines

Changes

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.

  1. 2d ago First seen · 1,218 lines · 168 tokens per session scan B 093a71d42ebd

Subscribe to this mod's changes

office-hours is a skill published in the GitHub repository GCWing/BitFun (1,871 stars, last pushed 2d ago), licensed MIT. It adds 168 tokens to every session and 16,480 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it B with 2 findings (sends data to an external url, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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