Borrowing it
Nothing to install: this file belongs to FlorianBruniaux/ctxharness. 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/FlorianBruniaux/ctxharness/main/.claude/skills/eval-skills/SKILL.mdgit clone --depth 1 https://github.com/FlorianBruniaux/ctxharnessWrote 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/florianbruniaux/ctxharness/eval-skills)<a href="https://agentmods.dev/skills/florianbruniaux/ctxharness/eval-skills"><img src="https://agentmods.dev/badge/skills/florianbruniaux/ctxharness/eval-skills/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/florianbruniaux/ctxharness/eval-skills"><img src="https://agentmods.dev/badge/skills/florianbruniaux/ctxharness/eval-skills.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 6 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 54 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
- medium Agent Snooping · line 2 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 14 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 54 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 55 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00066 | $0.00919 |
| Opus 5.5 | $0.00026 | $0.00368 |
| Sonnet 5.5 | $0.00013 | $0.00184 |
| Haiku 4.5 | $0.00007 | $0.00092 |
Grade A, and why
eval-skills scanned grade A 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 1mo 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.
Enumerates other installed skillslowAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
find .claude/skills -name "SKILL.md" 2>/dev/null Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
How it starts
The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Evaluator
Discover all skills, score them across 6 criteria, and infer the appropriate effort level based on content analysis.
When to Use
- After adding new skills to ctxharness
.claude/skills/ - Before cutting a release (quality gate)
- After bulk-importing skills from another project
- When adding
effortfields for the first time
Scoring Criteria (14 pts per skill)
| # | Criterion | Max | What is checked |
|---|---|---|---|
| 1 | name | 1 | Present, lowercase, hyphens only, matches directory name |
| 2 | description | 2 | Present + has "Use when" / trigger phrasing |
| 3 | allowed-tools | 2 | Present + not overly broad (Bash without scoping when read-only) |
| 4 | effort | 3 | Present (1pt) + appropriate for content (2pt based on inference) |
| 5 | content structure | 4 | Has Purpose/When section (1), has examples/usage (1), has clear workflow (1), no placeholder text (1) |
| 6 | bonus | +2 | argument-hint present (1), version/author metadata (1) |
Thresholds:
- ✅ Good: ≥11/14 (≥80%)
- ⚠️ Needs work: 8–10/14 (60–79%)
- ❌ Fix: <8/14 (<60%)
Effort Level Inference
low — Mechanical execution, no design decisions
Signals: commit, scaffold, generate, format, sync. No sub-agents. Short workflow (<5 steps).
medium — Analysis with bounded scope
Signals: review, triage, analyze, evaluate (single file or bounded scope). May spawn 1-2 sub-agents with predefined scope.
high — Design decisions, adversarial reasoning, cross-system analysis
Signals: architect, threat-model, audit (security), orchestrate (multi-agent). Broad tool access. Spawns multiple sub-agents.
If a skill has effort: already set but the inferred level differs, flag it:
⚠️ Effort mismatch: declared
low, inferredhigh
Execution Instructions
Step 1 — Discovery
find .claude/skills -name "SKILL.md" 2>/dev/null
find .claude/skills -maxdepth 1 -name "*.md" ! -name "README*" 2>/dev/null
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.
- 1mo ago First seen · 99 lines · 66 tokens per session scan A 03e613e93801
eval-skills is a skill published in the GitHub repository FlorianBruniaux/ctxharness (26 stars, last pushed 12d ago), licensed MIT. It adds 66 tokens to every session and 919 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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