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 product-on-purpose/agent-skills-toolkit --skill askit-build-agents-mdgit clone --depth 1 https://github.com/product-on-purpose/agent-skills-toolkitWrote 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/product-on-purpose/agent-skills-toolkit/askit-build-agents-md)<a href="https://agentmods.dev/skills/product-on-purpose/agent-skills-toolkit/askit-build-agents-md"><img src="https://agentmods.dev/badge/skills/product-on-purpose/agent-skills-toolkit/askit-build-agents-md/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/product-on-purpose/agent-skills-toolkit/askit-build-agents-md"><img src="https://agentmods.dev/badge/skills/product-on-purpose/agent-skills-toolkit/askit-build-agents-md.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 | $0.00064 | $0.00601 |
| Opus 5 | $0.00032 | $0.00300 |
| Sonnet 5 | $0.00013 | $0.00120 |
| Haiku 4.5 | $0.00006 | $0.00060 |
Grade A, and why
askit-build-agents-md 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 11d 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 — 31 lines — stays where its author put it; the contents beside it link to each section on GitHub.
askit-build-agents-md
Purpose
Author and keep current a plugin's AGENTS.md: the project-level agent instructions and navigation entrypoint, the first thing an agent reads (Standard sec 3.10). It is the single most portable cross-tool surface (Claude, Codex, Gemini, Copilot, and Cursor all read AGENTS.md). Two modes: create authors a tight AGENTS.md; improve syncs it to the component index and trims it. Authoring depth is in references/authoring-agents-md.md. Follows the shared builder contract (../../docs/reference/builder-pattern.md).
When to use
When the user asks to author, write, sync, or trim AGENTS.md (or CLAUDE.md), or when components were added or removed and the navigation is stale.
create mode
- Brief interview: what the project is, the conventions (runtime, build/test/lint), and the boundaries. Skip if in context.
- Author a TIGHT AGENTS.md: what-this-is, current-state (read before assuming capabilities), conventions, build/test/lint, where-to-look. Keep it minimal and essential-only, and prefer positive instructions over long "do not" lists. Verbose, generated-looking context files measurably reduce agent task success and raise cost, so brevity is a feature, not a shortcut.
- Keep the component list aligned with
library.jsonand the index.node scripts/generators/sync-agents-md.mjsrenders the component section from the manifest so it does not drift. - Evaluate (
node scripts/evaluate.mjs . --json); AGENTS.md presence is checked by U2 (anatomy), and the description and instruction-budget rules apply.
improve mode
- Run evaluate and read findings; sync the component list to disk.
- Trim: remove redundancy and non-essential prohibitions; judge each change by whether it helps an agent act correctly, not by length.
- Re-run to confirm.
Scope
AGENTS.md is Universal-tier and the cheapest credible cross-tool surface. Keep it brief and current; the generated component section (sync-agents-md) prevents drift from the manifest. A CLAUDE.md is a Claude-specific sibling for the same purpose when a project needs Claude-only guidance.
What ships with it
3 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.
- 11d ago First seen · 31 lines · 64 tokens per session scan A d445f2985839
askit-build-agents-md is a skill published in the GitHub repository product-on-purpose/agent-skills-toolkit (2 stars, last pushed today), licensed Apache-2.0. It adds 64 tokens to every session and 601 once invoked, about $0.0003 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.
Other skills, from other repositories
modelchk
Size a task's run before spending it: the cheapest sufficient capability tier (fast, standard, frontier) and the reasoning effort within it, on a neutral scale that binds to whatever levels the model exposes. Use when work seems over- or under-powered, costly, ambiguous, or high-risk, or asks which model class and how…
autobahn
Carve guardrail-adjacent items out of scope with safe alternatives before risk-adjacent work starts, then run the safe remainder at full strength in a fresh subagent that only ever sees the carved prompt, never the risky input. Use when a task includes stealth, scraping, privacy, IP, policy, licensing, security, or…
re0-release
Walk a pending change through this repo's shipping and releasing checklist end to end, then tag and publish once confirmed. User-invoked: run it when you've decided to ship.
ssotize
Audit and consolidate a fact that's scattered across places into one canonical source, after approval, and replace the rest with references. Use when asked to find duplication, check consistency, locate the source of truth, deduplicate, consolidate, unify, or establish SSOT across artifacts or platforms. Starts…
re0-plan
Open a paperthin iteration's casebook before re0-loop's first turn — seeded with real content the moment the folder exists, never an empty directory. User-invoked, paperthin-only: assumes the full skill package installed. Run when opening a new build cycle in this repo.
dedash
Remove em-dashes and the dashes standing in for them from a user-owned scope, reading each occurrence in context and choosing the punctuation or wording that fits.