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 escapeboy/ai-prompts --skill cache-inspectorgit clone --depth 1 https://github.com/escapeboy/ai-promptsWrote 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/escapeboy/ai-prompts/cache-inspector)<a href="https://agentmods.dev/skills/escapeboy/ai-prompts/cache-inspector"><img src="https://agentmods.dev/badge/skills/escapeboy/ai-prompts/cache-inspector/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/escapeboy/ai-prompts/cache-inspector"><img src="https://agentmods.dev/badge/skills/escapeboy/ai-prompts/cache-inspector.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Agent Snooping · line 18 Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
- high Agent Snooping · line 55 Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
- high Agent Snooping · line 73 Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
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 | $0.00050 | $0.01097 |
| Opus 5.5 | $0.00020 | $0.00439 |
| Sonnet 5.5 | $0.00010 | $0.00219 |
| Haiku 4.5 | $0.00005 | $0.00110 |
Grade B, and why
cache-inspector scanned grade B with 1 finding 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 27d 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
| Producing a cost/hit-rate report or tracking trend over sessions | A one-off "is caching on?" check — read `~/.claude/settings/prompt-caching.json` | How it starts
The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/cache-inspector — Prompt Cache Monitor
Inspects the Claude prompt caching system to report hit rates, cost savings, and optimization opportunities. Prompt caching saves 90% on re-reads of large content (system prompts, memories, tool definitions).
When to Use This Skill (and When NOT to)
| Use this skill for | Use a simpler approach for |
|---|---|
| Investigating why a session's token cost is high | A single expensive read you already understand — just cache that content, no analysis needed |
| Diagnosing a low or slow-warming cache hit rate | A fresh session that has simply not warmed yet — wait 2-3 messages before measuring |
| Deciding which memories/prompts are worth caching | Content you already know is under 1024 tokens — it can't cache; expand or merge it directly |
| Producing a cost/hit-rate report or tracking trend over sessions | A one-off "is caching on?" check — read ~/.claude/settings/prompt-caching.json |
Start simple. Reach for this skill only when cache behaviour is actually costing tokens or you need to measure/optimize it — not to confirm a single obvious cache decision.
Usage
/cache-inspector [action]
Quick Examples
/cache-inspector # Show current status (default)
/cache-inspector status # Detailed cache status
/cache-inspector analyze # Performance analysis with trends
/cache-inspector optimize # Get actionable recommendations
/cache-inspector report # Full report (save to file)
/cache-inspector clear # Clear cache (for testing only)
Actions
Each action's full behaviour, options, and exact output shape are in references/actions.md — read it for the detail behind the summaries below.
| Action | Purpose |
|---|---|
status (default) |
Current cache state: active entries, session hits/savings, health verdict. |
analyze |
Deep performance analysis with hit-rate trend, cost impact, and optimization opportunities. |
optimize |
Prioritized, actionable recommendations to raise the hit rate, with an estimated score delta. |
report |
Full report (history, cost breakdown, inventory, TTL timeline, score); --save writes to .claude/learnings/cache-performance.md. |
clear |
Clears all cached content (testing/stale-cache only). Confirms first; next session re-warms at full cost. |
What ships with it
3 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.
- 27d ago Changed 7405df62f2d5
- 1mo ago First seen · 88 lines · 50 tokens per session scan B da8b0934cefc
cache-inspector is a skill published in the GitHub repository escapeboy/ai-prompts (91 stars, last pushed 15d ago), licensed MIT. It adds 50 tokens to every session and 1,097 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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