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 KirKruglov/claude-skills-kit --skill context-builder-coworkgit clone --depth 1 https://github.com/KirKruglov/claude-skills-kitWrote 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/kirkruglov/claude-skills-kit/context-builder-cowork)<a href="https://agentmods.dev/skills/kirkruglov/claude-skills-kit/context-builder-cowork"><img src="https://agentmods.dev/badge/skills/kirkruglov/claude-skills-kit/context-builder-cowork/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/kirkruglov/claude-skills-kit/context-builder-cowork"><img src="https://agentmods.dev/badge/skills/kirkruglov/claude-skills-kit/context-builder-cowork.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 | $0.00087 | $0.01325 |
| Opus 5 | $0.00044 | $0.00662 |
| Sonnet 5 | $0.00017 | $0.00265 |
| Haiku 4.5 | $0.00009 | $0.00133 |
Grade A, and why
context-builder-cowork 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 11d 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 — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Context Builder Cowork
Generates a ready-to-use project-context.md for Claude Cowork based on user answers through a structured interview. Supports two modes: full interview (15 questions across 9 blocks) and quick mode (first 3 blocks only, rest filled with placeholders).
For: anyone who works with Claude Cowork and needs a structured project context file for a new or existing project.
Language Detection
Detect the language of the user's first message — use it throughout the entire session: all interview questions, the generated file content, and section headers. Russian input → conduct interview and generate file in Russian. English input → conduct interview and generate file in English.
Input
Required:
- User's message requesting context creation (sets language and mode)
Optional:
- Keyword "quick" / "быстрый" in the trigger → activates quick mode (blocks 1–3 only, rest →
[to clarify]/[уточнить])
Output
A ready-to-download project-context.md file structured across up to 9 content blocks, with [to clarify] / [уточнить] placeholders for missing information and a changelog entry with creation date.
Instructions
Step 1 — Determine mode
If the user wrote "quick context" / "быстрый контекст" → use quick mode (questions 1–8, blocks 1–3 only). Otherwise → use new mode (all 15 questions, all 9 blocks).
| Mode | Trigger | What it does |
|---|---|---|
new |
"create project context" / "создай контекст проекта" | Full interview, all blocks |
quick |
"quick context" / "быстрый контекст" | Blocks 1–3 only, rest → placeholders |
Step 2 — Conduct the interview
Ask questions in blocks, not all at once. Wait for the user's response after each block, then proceed to the next.
Block 1 — Basics
1. Project name?
2. Type: business / analytics / personal / other?
3. Status: Active / On hold / Completed?
4. Start date? Deadline (if any)?
Block 2 — Project essence
5. Describe the project in 2–4 sentences.
6. Vision — what outcome counts as project success?
What ships with it
2 files 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.
- 11d ago First seen · 184 lines · 87 tokens per session scan A b60a55004b7c
context-builder-cowork is a skill published in the GitHub repository KirKruglov/claude-skills-kit (18 stars, last pushed 1mo ago), licensed MIT. It adds 87 tokens to every session and 1,325 once invoked, about $0.0004 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 2026-08-30.
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