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/nklisch/skilltap/agent-extension-standardsnpx skills add nklisch/skilltap --skill agent-extension-standardsgit clone --depth 1 https://github.com/nklisch/skilltapWrote 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/nklisch/skilltap/agent-extension-standards)<a href="https://agentmods.dev/skills/nklisch/skilltap/agent-extension-standards"><img src="https://agentmods.dev/badge/skills/nklisch/skilltap/agent-extension-standards.svg" alt="Measured on agentmods" 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 | $0.00081 | $0.00606 |
| Opus 5 | $0.00041 | $0.00303 |
| Sonnet 5 | $0.00016 | $0.00121 |
| Haiku 4.5 | $0.00008 | $0.00061 |
Grade A, and why
agent-extension-standards 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 6d 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 — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Extension Standards
Ground extension work in the current research substrate. Do not reuse remembered Claude-only marketplace assumptions or flatten the two harnesses into a generic plugin format.
Load the applicable contract
Read .research/analysis/briefs/current-agent-extension-standards.md before
making an architectural or behavioral decision in this domain.
Load a specialist brief when exact native details matter:
- Codex:
.research/analysis/campaigns/marketplace-standards/specialists/codex.md - Claude Code:
.research/analysis/campaigns/marketplace-standards/specialists/claude.md - Agent Skills:
.research/analysis/campaigns/marketplace-standards/specialists/agent-skills.md
Use attestations under .research/attestation/ for source-direct verification.
Treat specialist briefs and the parent synthesis as analytical guidance, not
primary sources. Never cite .research/.import-holding/ as evidence.
Preserve these boundaries
- Treat a skill as its complete directory with top-level
SKILL.md. Never manage only the Markdown file when sibling resources exist. - Use
.agents/skills/as skilltap's canonical portable placement when the skill is compatible. Create harness-native links or copies through adapters. - Keep Codex and Claude plugin manifests, catalogs, identities, caches, scopes, consent, and update semantics distinct.
- Prefer deterministic native marketplace and plugin operations. Do not mutate a native plugin cache as an installation API.
- Keep
~/AGENTS.mdas skilltap's canonical global instruction file and model~/.codex/AGENTS.mdand~/.claude/CLAUDE.mdas native bridges, including their precedence and divergence hazards. - Separate desired skilltap state, native declared state, and effective installed state.
- Classify transfer as faithful, materializable, partial, or blocked. Surface material consequences for piecewise operation-scoped approval.
- Register only sources selected by the user. Do not add search, browsing, ranking, recommendation, or inventory-discovery behavior.
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.
- 6d ago First seen · 54 lines · 81 tokens per session scan A 81bc06fe0d35
agent-extension-standards is a skill published in the GitHub repository nklisch/skilltap (6 stars, last pushed 21d ago), licensed MIT. It adds 81 tokens to every session and 606 once invoked, about $0.0004 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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