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 NikiforovAll/claude-code-rules --skill handbook-discovergit clone --depth 1 https://github.com/NikiforovAll/claude-code-rulesWrote 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/nikiforovall/claude-code-rules/handbook-discover)<a href="https://agentmods.dev/skills/nikiforovall/claude-code-rules/handbook-discover"><img src="https://agentmods.dev/badge/skills/nikiforovall/claude-code-rules/handbook-discover.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 | $0.00075 | $0.00362 |
| Opus 5 | $0.00037 | $0.00181 |
| Sonnet 5 | $0.00015 | $0.00072 |
| Haiku 4.5 | $0.00007 | $0.00036 |
Grade A, and why
handbook-discover 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
Handbook Plugin Discovery
Run the discovery script to inventory all plugins in a Claude Code marketplace.
Usage
python ${CLAUDE_SKILL_DIR}/scripts/discover.py # default: cc-handbook
python ${CLAUDE_SKILL_DIR}/scripts/discover.py --detailed # show component names
python ${CLAUDE_SKILL_DIR}/scripts/discover.py --json # machine-readable
python ${CLAUDE_SKILL_DIR}/scripts/discover.py --filter dotnet # filter by keyword
python ${CLAUDE_SKILL_DIR}/scripts/discover.py --uninstalled # only uninstalled
python ${CLAUDE_SKILL_DIR}/scripts/discover.py -m <marketplace> # other marketplace
python ${CLAUDE_SKILL_DIR}/scripts/discover.py -r <path> # explicit repo path
Interpreting Results
[+]— installed and enabled[o]— installed but disabled[ ]— not installed- Component counts:
S=skillsA=agentsC=commandsM=mcpL=lspH=hooks
Follow-up Actions
For uninstalled plugins, suggest:
claude plugin install <plugin-name>@cc-handbook
What ships with it
1 file 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.
- 7d ago First seen · 35 lines · 75 tokens per session scan A d95aa945594e
handbook-discover is a skill published in the GitHub repository NikiforovAll/claude-code-rules (141 stars, last pushed 8d ago), licensed Apache-2.0. It adds 75 tokens to every session and 362 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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