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 stevesolun/ctx --skill skill-routergit clone --depth 1 https://github.com/stevesolun/ctxWrote 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/stevesolun/ctx/skill-router)<a href="https://agentmods.dev/skills/stevesolun/ctx/skill-router"><img src="https://agentmods.dev/badge/skills/stevesolun/ctx/skill-router.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00304 |
| Opus 5 | $0.00015 | $0.00152 |
| Sonnet 5 | $0.00006 | $0.00061 |
| Haiku 4.5 | $0.00003 | $0.00030 |
Grade A, and why
skill-router 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 4d 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
skill-router
Reads ~/.claude/skill-manifest.json and ~/.claude/pending-skills.json.
Executes the 5-stage pipeline. No skipping stages.
Pipeline
01-scope → 02-plan → 03-build → 04-check → 05-deliver
Invoke When
- Session starts (automatic via using-superpowers pattern)
- User switches projects or opens a new repo
pending-skills.jsonexists (mid-session signals detected)- User asks "what skills are loaded?" or "update my skills"
Stage Files
All stage files are in references/. Read and follow each in order.
- 01-scope — Is a scan needed?
- 02-plan — Run the scanner
- 03-build — Resolve the manifest
- 04-check — Validate before loading
- 05-deliver — Present to user
See check-gates.md for validation questions.
What ships with it
5 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.
- 4d ago First seen · 38 lines · 29 tokens per session scan A c594f112964c
skill-router is a skill published in the GitHub repository stevesolun/ctx (583 stars, last pushed 8d ago), licensed MIT. It adds 29 tokens to every session and 304 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 2026-09-03.
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