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 thermiteau/maverick --skill mav-bp-api-designgit clone --depth 1 https://github.com/thermiteau/maverickWrote 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/thermiteau/maverick/mav-bp-api-design)<a href="https://agentmods.dev/skills/thermiteau/maverick/mav-bp-api-design"><img src="https://agentmods.dev/badge/skills/thermiteau/maverick/mav-bp-api-design/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/thermiteau/maverick/mav-bp-api-design"><img src="https://agentmods.dev/badge/skills/thermiteau/maverick/mav-bp-api-design.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 | $0.00049 | $0.00900 |
| Opus 5 | $0.00024 | $0.00450 |
| Sonnet 5 | $0.00010 | $0.00180 |
| Haiku 4.5 | $0.00005 | $0.00090 |
Grade A, and why
mav-bp-api-design 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.
How it starts
The opening of the file, as written. The whole thing — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Design Standards
Ensure all APIs (REST, GraphQL, or any other surface) are consistent, predictable, documented as code, and backwards compatible by default.
Maverick's Rules
- Backwards compatible by default — additions are safe; removing/renaming fields, changing types or semantics, making optional fields required, changing URL structure, or removing endpoints requires a version bump. Support at minimum the current and previous version. Deprecate before removal: mark in the spec, send
Deprecation/Sunsetheaders, log usage, communicate a timeline, remove only at zero usage. - One versioning strategy per project (URL path or Accept header), applied consistently; increment only for breaking changes.
- Consistent error envelope on every error: machine-readable
code(a string constant, not the HTTP status), user-safemessage, optional field-leveldetails, and acorrelationId. Never expose stack traces, internal paths, or implementation details. - Documentation generated from source — OpenAPI generated from or validated against code; GraphQL via introspection. Never a separately maintained wiki (it drifts). Include examples, auth requirements, rate limits, and error codes.
- Pagination on every list endpoint — cursor-based preferred (opaque cursors,
cursor+limitparams, documented maximum); offset-based only for small, stable datasets needing random page access. - Rate limiting on all public endpoints — return
429, includeX-RateLimit-*andRetry-Afterheaders, apply per-tier limits, document them. - Idempotency:
PUT/DELETEidempotent by design;POSToperations that must be idempotent (e.g., payments) require anIdempotency-Keyheader with cached-response replay and a TTL. Document which endpoints support it. - Validate at the boundary before business logic runs; reject unexpected fields rather than silently ignoring them; enforce size limits. See
mav-bp-application-security. - GraphQL specifics: fields non-nullable by default (nullable only when absence is a valid state); enforce query depth/complexity limits; DataLoader or equivalent for N+1 prevention; persisted queries in production where possible.
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 · 46 lines · 49 tokens per session scan A 2cd1a7a78dfc
mav-bp-api-design is a skill published in the GitHub repository thermiteau/maverick (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 49 tokens to every session and 900 once invoked, about $0.0002 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 2026-08-30.
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