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/thiientv/godmode/api-and-interface-designnpx skills add thiientv/godmode --skill api-and-interface-designgit clone --depth 1 https://github.com/thiientv/godmodeWhat 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 | $0.00087 | $0.00397 |
| Opus 5 | $0.00044 | $0.00198 |
| Sonnet 5 | $0.00017 | $0.00079 |
| Haiku 4.5 | $0.00009 | $0.00040 |
Grade A, and why
api-and-interface-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 3d 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 and Interface Design
Design the contract from the caller's failure modes, not only the happy path.
Establish the contract
- Identify consumers, trust boundaries, lifecycle, latency expectations, and ownership.
- Define request/command shape, response/event shape, status or error model, validation, defaults, and canonical examples.
- Decide idempotency, retries, ordering, pagination, concurrency, rate limits, cancellation, and partial failure behavior.
- Define authentication, authorization, sensitive fields, and audit needs.
- Decide compatibility and versioning: additive change, migration, deprecation, or explicit breaking release.
Read contract-checklist.md for the review matrix. Keep the contract close to the owning schema or source of truth and generate clients/docs only when the repository already supports generation.
Implementation handoff
Write examples that can become contract tests. Include malformed input, missing resource, duplicate request, timeout, dependency failure, permission denial, and oversized input cases. Make error codes stable enough for callers and messages safe enough for logs and users.
Do not expose internal stack traces, persistence identifiers, or implementation details by accident. Do not add versioning machinery before a compatibility need exists.
Completion condition
Consumers can predict valid requests, successful and failed responses, retry behavior, compatibility impact, and the evidence that proves the boundary.
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.
- 3d ago First seen · 47 lines · 87 tokens per session scan A 79cc2dc7c512
api-and-interface-design is a skill published in the GitHub repository thiientv/godmode (93 stars, last pushed 7d ago), licensed MIT. It adds 87 tokens to every session and 397 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 2026-08-30.
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