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 Tarekkharsa/agentstack --skill api-conventionsgit clone --depth 1 https://github.com/Tarekkharsa/agentstackWrote 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/tarekkharsa/agentstack/api-conventions)<a href="https://agentmods.dev/skills/tarekkharsa/agentstack/api-conventions"><img src="https://agentmods.dev/badge/skills/tarekkharsa/agentstack/api-conventions.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 | $0.00024 | $0.00193 |
| Opus 5 | $0.00012 | $0.00097 |
| Sonnet 5 | $0.00005 | $0.00039 |
| Haiku 4.5 | $0.00002 | $0.00019 |
Grade A, and why
api-conventions 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 7d 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
API conventions
STOREFRONT-SKILL-CONV-Q3: these are the conventions every storefront endpoint follows.
Resources
- Success responses wrap the payload:
{ "data": <resource-or-list> }. - A resource is
{ id, name, cents }. Prices are integer cents, never floats.
Errors
- Always the shared envelope:
{ "error": { "code": string, "message": string } }. - Known codes:
bad_request(400),not_found(404),conflict(409).
Pagination
- List endpoints accept
?limit(default 20, max 100) and?cursor. - Return the next cursor as
{ "data": [...], "next": string | null }.
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.
- 7d ago First seen · 24 lines · 24 tokens per session scan A 27f6e5167c86
api-conventions is a skill published in the GitHub repository Tarekkharsa/agentstack (3 stars, last pushed 24d ago), licensed Apache-2.0. It adds 24 tokens to every session and 193 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 2026-08-31.
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