Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add musingfox/cc-plugins/plugin install diagnoseWrote 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/musingfox/cc-plugins/diagnose-now)<a href="https://agentmods.dev/skills/musingfox/cc-plugins/diagnose-now"><img src="https://agentmods.dev/badge/skills/musingfox/cc-plugins/diagnose-now/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/musingfox/cc-plugins/diagnose-now"><img src="https://agentmods.dev/badge/skills/musingfox/cc-plugins/diagnose-now.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 | $0.00020 | $0.00186 |
| Opus 5.5 | $0.00008 | $0.00074 |
| Sonnet 5.5 | $0.00004 | $0.00037 |
| Haiku 4.5 | $0.00002 | $0.00019 |
Grade A, and why
diagnose-now 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 10d 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.
What it actually says
Diagnose now
Typing this name is the confirmation. Do not ask whether to proceed.
If the target is not a git repository, stop before attempting a worktree and say so.
Treat $ARGUMENTS as the symptom when present. If none was supplied and the conversation has no observed symptom either, ask in plain prose what is broken. That is an input question, not permission to run. The symptom names the slug, so no worktree exists before it is known.
Then Read ${CLAUDE_PLUGIN_ROOT}/docs/method.md and follow it from Phase 0 to the closing hand-off. The HITL template path is ${CLAUDE_PLUGIN_ROOT}/scripts/hitl-loop.template.sh.
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.
- 10d ago Changed · +1 lines 545d4c3124e4
- 1mo ago First seen · 16 lines · 20 tokens per session scan A 17f475bead73
diagnose-now is a skill published in the GitHub repository musingfox/cc-plugins (2 stars, last pushed yesterday), licensed MIT. It adds 20 tokens to every session and 186 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-11.
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