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 agentmods add skills/jackchuka/skillctx/skillctx-syncnpx skills add jackchuka/skillctx --skill skillctx-syncgit clone --depth 1 https://github.com/jackchuka/skillctxWhat 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 | $0.00038 | $0.00744 |
| Opus 5 | $0.00019 | $0.00372 |
| Sonnet 5 | $0.00008 | $0.00149 |
| Haiku 4.5 | $0.00004 | $0.00074 |
Grade A, and why
skillctx-sync 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
skillctx-sync
Update embedded skillctx-resolve.py scripts across all migrated skills.
When to Use
- After updating the skillctx repo (bug fix in resolve.py, new features)
- User says "skillctx-sync", "update skillctx", or "sync skillctx"
Prerequisites
- Python 3.10+
- Skills must be installed and discoverable by the agent host
Workflow
-
Read current version: Run
python <skill-dir>/scripts/sync.pywith--helpto verify the script is available. Readpyproject.tomlin the skillctx repo root for the current version string. -
Scan for migrated skills: Run
python <skill-dir>/scripts/sync.py scan <skills-dir> <current-version>where<skills-dir>is the directory containing installed skills. The script outputs JSON:[ { "skill": "my-skill", "path": "/path/to/my-skill", "version": "0.1.0", "status": "outdated" }, { "skill": "other-skill", "path": "/path/to/other-skill", "version": "0.2.0", "status": "current" } ]Only skills with
<!-- skillctx:begin -->in their SKILL.md are included. -
Present outdated skills to user: Filter the scan results to
"status": "outdated"and show:Skills with outdated skillctx resolver: - my-skill (v0.1.0 → v0.2.0) - another-skill (v0.1.0 → v0.2.0) Update all? (yes/select/cancel)Wait for user confirmation.
-
Update each selected skill: For each skill the user approves, run:
python <skill-dir>/scripts/sync.py update <skill-dir> <resolver-src> <current-version>Where
<resolver-src>isskills/skillctx-ify/scripts/resolve.py(the canonical resolver in this repo). The script:- Copies the resolver to
<skill-dir>/scripts/skillctx-resolve.py - Replaces the
<!-- skillctx:begin -->...<!-- skillctx:end -->block with the latest setup template - Updates
metadata.skillctx.versionin the skill's frontmatter
- Copies the resolver to
-
Report what was updated and any errors.
Error Handling
| Error | Action |
|---|---|
| No migrated skills found | Report "no skills using skillctx found" |
| All skills already current | Report "all skills up to date" |
| Skill directory not writable | Warn and skip, list at the end |
Missing <!-- skillctx:end --> marker |
Warn — setup block may be malformed. Skip and list for manual review. |
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.
- 2d ago First seen · 81 lines · 38 tokens per session scan A 0fd04bc4ee0d
skillctx-sync is a skill published in the GitHub repository jackchuka/skillctx (5 stars, last pushed 15d ago), licensed MIT. It adds 38 tokens to every session and 744 once invoked, about $0.0002 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 2026-08-31.
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