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 ahamedzoha/atelier --skill milestonegit clone --depth 1 https://github.com/ahamedzoha/atelierWrote 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/ahamedzoha/atelier/milestone)<a href="https://agentmods.dev/skills/ahamedzoha/atelier/milestone"><img src="https://agentmods.dev/badge/skills/ahamedzoha/atelier/milestone/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/ahamedzoha/atelier/milestone"><img src="https://agentmods.dev/badge/skills/ahamedzoha/atelier/milestone.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 | $0.00047 | $0.00145 |
| Opus 5.5 | $0.00019 | $0.00058 |
| Sonnet 5.5 | $0.00009 | $0.00029 |
| Haiku 4.5 | $0.00005 | $0.00015 |
Grade A, and why
milestone 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 2mo 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
Run the workflow in docs/playbooks/milestone.md.
Read the active mode and current phase from PROJECT.md first, find the next
milestone in docs/progress.md, then write
docs/milestones/<phase>.<n>-<slug>.md from the six-part template. Respect the
mode (in guided, deliver annotated snippets only — never edit app code).
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.
- 2mo ago First seen · 12 lines · 47 tokens per session scan A 9eda9be00972
milestone is a skill published in the GitHub repository ahamedzoha/atelier (3 stars, last pushed 4mo ago), licensed MIT. It adds 47 tokens to every session and 145 once invoked, about $0.0002 per session on Opus 5.5. 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
fable-skill
Build/debug/research/write/review/plan/analyze/operate.
pin-guardrail
Pin a shell guardrail (a hook, a git hook, a checker script) with a behavioral test suite, prove the suite is real by mutating the code, and wire it into CI with its mutation ledger. Use when asked to "add tests for this hook", "pin that guard", "mutation-test this script", "this hook has no test", "wire the suite…
build-verification-skill
Build this project's verification skill - a small CLI that drives the running app and captures evidence, plus a feature map of what exists and how to reach it - and the CI check that keeps the map current. Use when asked to 'build a verification skill', 'let the agent drive the app', 'make a feature map', 'the agent…
learn
Review the current conversation and update project knowledge artifacts - common-gotchas.md (bug patterns), conventions at the highest rung that holds them (code, check, reviewer standard, skill, then AGENTS.md), navigation pointers, agent memory (cross-session). Use when asked to '/learn', 'what did we learn'…
review-dependency-updates
Review outdated dependencies, security-scan each candidate bump against OSV.dev, then apply only the safe updates and PR them. Use when asked to 'review dependency updates', 'what can/should be updated', 'are we exposed to ', 'bump dependencies safely'.
trellis-sync
Check this project against the template it was made from, show what changed upstream, and apply only what the user picks. Use when asked to "check for template updates", "sync with trellis", "is my template copy out of date", "pull in upstream template changes", "what changed in the template".