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 ychampion/cskill-agents --skill seed-before-diff-marketplace-registrationgit clone --depth 1 https://github.com/ychampion/cskill-agentsWrote 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/ychampion/cskill-agents/seed-before-diff-marketplace-registration)<a href="https://agentmods.dev/skills/ychampion/cskill-agents/seed-before-diff-marketplace-registration"><img src="https://agentmods.dev/badge/skills/ychampion/cskill-agents/seed-before-diff-marketplace-registration/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/ychampion/cskill-agents/seed-before-diff-marketplace-registration"><img src="https://agentmods.dev/badge/skills/ychampion/cskill-agents/seed-before-diff-marketplace-registration.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00029 | $0.00306 |
| Opus 5 | $0.00015 | $0.00153 |
| Sonnet 5 | $0.00006 | $0.00061 |
| Haiku 4.5 | $0.00003 | $0.00031 |
Grade A, and why
seed-before-diff-marketplace-registration 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 9d 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: Seed-Before-Diff Marketplace Registration
Domain: extensions-mcp Trigger: Use when bootstrap or pre-seeded extension sources should participate in reconcile logic without being recloned or reported as missing. Source Pattern: Distilled from reviewed seeded-source bootstrap and reconcile flows.
Core Method
Insert seeded or bootstrap sources into the materialized registry before computing the install diff. That lets the reconciler classify seeded entries as already present instead of missing, which avoids redundant installs and aligns early cache behavior with the real source set. If seed registration changes the materialized registry, propagate that as a real change and clear dependent caches immediately.
Key Rules
- Register seeds before diffing so bootstrap content is not misclassified as missing.
- Keep seed registration idempotent so repeated startups can re-run it safely.
- Treat seed registration as a real materialized change when it alters registry state.
Example Application
If a headless runtime starts with a mounted seed directory of official sources, register those seeds first so the reconcile pass skips unnecessary clone work.
Anti-Patterns (What NOT to do)
- Do not diff before seed registration.
- Do not skip cache invalidation when seed registration changed the materialized state.
- Do not maintain seeded sources outside the normal registry contract.
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.
- 9d ago First seen · 28 lines · 29 tokens per session scan A c6072eaaca6e
seed-before-diff-marketplace-registration is a skill published in the GitHub repository ychampion/cskill-agents (36 stars, last pushed 5mo ago), licensed MIT. It adds 29 tokens to every session and 306 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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