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 egorfedorov/claude-context-optimizer/plugin install claude-context-optimizerWrote 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/egorfedorov/claude-context-optimizer/cco-doctor)<a href="https://agentmods.dev/skills/egorfedorov/claude-context-optimizer/cco-doctor"><img src="https://agentmods.dev/badge/skills/egorfedorov/claude-context-optimizer/cco-doctor/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/egorfedorov/claude-context-optimizer/cco-doctor"><img src="https://agentmods.dev/badge/skills/egorfedorov/claude-context-optimizer/cco-doctor.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 | $0.00029 | $0.00361 |
| Opus 5 | $0.00015 | $0.00180 |
| Sonnet 5 | $0.00006 | $0.00072 |
| Haiku 4.5 | $0.00003 | $0.00036 |
Grade A, and why
cco-doctor 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 7d 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
CCO Doctor
When the user runs /cco-doctor or reports the plugin "isn't working", run a quick health check.
How to use
Standard run (fast — under 1s):
node ${CLAUDE_PLUGIN_ROOT}/src/doctor.js
With test suite (slower — runs all unit tests):
node ${CLAUDE_PLUGIN_ROOT}/src/doctor.js --tests
What it checks
- Plugin manifest and
package.jsonexist - Versions are in sync (
plugin.jsonandpackage.json) hooks.jsonis valid JSON with all expected event types- All hook scripts present in
src/ - Data directory
~/.claude-context-optimizer/is writable patterns.jsonsize is reasonable- Global stats file is parseable
- User config has sane model + budget for the chosen model
- Node version meets the >=18 requirement
Presentation
Translate the doctor output into plain language. If anything is fail, walk the user through the fix:
- versions out of sync →
npm run sync-version - patterns.json too big →
/cco-clean - budget > model window →
/cco-budget set <smaller>or pick a 1M-context model (e.g.opus-5) - node too old → upgrade Node
If everything is pass, confirm "плагин в порядке, текущая версия Х.Y.Z" and stop.
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.
- 7d ago Changed 8724a7dd7313
- 11d ago First seen · 45 lines · 29 tokens per session scan A 4eb5b50dd7c4
cco-doctor is a skill published in the GitHub repository egorfedorov/claude-context-optimizer (110 stars, last pushed 9d ago), licensed MIT. It adds 29 tokens to every session and 361 once invoked, about $0.0001 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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