Borrowing it
Nothing to install: this file belongs to MUmerRazzaq/claude-code-skills-lab. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/MUmerRazzaq/claude-code-skills-lab/master/.claude/skills/chatkit/SKILL.mdgit clone --depth 1 https://github.com/MUmerRazzaq/claude-code-skills-labWrote 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/mumerrazzaq/claude-code-skills-lab/chatkit)<a href="https://agentmods.dev/skills/mumerrazzaq/claude-code-skills-lab/chatkit"><img src="https://agentmods.dev/badge/skills/mumerrazzaq/claude-code-skills-lab/chatkit.svg" alt="Measured on agentmods" 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 | $0.00081 | $0.02555 |
| Opus 5 | $0.00041 | $0.01277 |
| Sonnet 5 | $0.00016 | $0.00511 |
| Haiku 4.5 | $0.00008 | $0.00255 |
Grade B, and why
chatkit 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 8d 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.
- [ ] `curl -X POST .../chatkit -d '{"type":"new_thread"}'` returns thread_id Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -X POST http://localhost:8000/chatkit \ The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
8 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.
- 8d ago First seen · 297 lines · 81 tokens per session scan B d2c61683de66
chatkit is a skill published in the GitHub repository MUmerRazzaq/claude-code-skills-lab (5 stars, last pushed 8mo ago), with no licence file. It adds 81 tokens to every session and 2,555 once invoked, about $0.0004 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 2026-08-31.
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