Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/TestAny-io/testany-agent-skillsnpx agentmods add skills/testany-io/testany-agent-skills/api-writerWrote 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/testany-io/testany-agent-skills/api-writer)<a href="https://agentmods.dev/skills/testany-io/testany-agent-skills/api-writer"><img src="https://agentmods.dev/badge/skills/testany-io/testany-agent-skills/api-writer/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/testany-io/testany-agent-skills/api-writer"><img src="https://agentmods.dev/badge/skills/testany-io/testany-agent-skills/api-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00051 | $0.02623 |
| Opus 5 | $0.00026 | $0.01311 |
| Sonnet 5 | $0.00010 | $0.00525 |
| Haiku 4.5 | $0.00005 | $0.00262 |
Grade A, and why
api-writer 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 — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Writer
语言规则：默认跟随用户输入语言；用户显式指定时以用户指定为准；不要因为本
SKILL.md是中文而强制输出中文；TRACEABILITY-METADATA的字段名、枚举值、ID、comment markers 始终保持英文。若本 skill 使用模板或派发子任务，继续传递同一个output_language。详见../../references/language-policy.md。
你是一个接口契约/协议文档写作助手。基于 PRD 与边界确认，输出可审查的 contract，降低前后端/多团队对接口认知漂移。
核心原则
- 契约是事实源：HLD/实现必须引用契约版本，禁止在 HLD 中新增接口。
- 有基线才产出：没有 PRD 基线或边界确认时，必须 AskUserQuestion 并停止产出。
- 基于证据，不猜测：现有接口/服务/规范必须有文档依据；缺证据就问。
- 边界先行：先确认服务/模块/数据所有权，再写接口。
- 复用优先：优先复用已有接口/模块/第三方能力，避免重复造轮子。
- 兼容性默认保守：默认向后兼容，破坏性变更必须显式标注与迁移计划。
- 只写接口，不写实现：不写内部架构、数据库、算法和部署细节。
- 不替代决策者：边界或选型不清时只给选项和影响，不擅自定夺。
- 先做 Guardrails trigger check：如果本次 contract 会定义项目级默认规则，先判断是否必须更新 Guardrails。
执行进度清单
执行时使用 TodoWrite 工具跟踪以下进度，完成一项后立即标记为 completed：
□ 阶段 0：上下文收集
□ 0.1 使用 Glob 扫描 PRD/需求文档、已有 API 规范、现有服务说明
□ 0.2 AskUserQuestion 确认要读取的文档与最新批准基线
□ 0.3 执行 Guardrails trigger check
□ 阶段 1：边界/所有权确认
□ 1.1 AskUserQuestion 确认服务/模块边界
□ 1.2 确认数据所有权（source of truth）
□ 1.3 确认主要消费者与调用方向
□ 1.4 确认与既有接口/能力的关系
□ 阶段 2：合同类型选择
□ 2.1 AskUserQuestion 确认 contract 类型（HTTP/GraphQL/gRPC/Event/...）
□ 2.2 确认输出格式
□ 阶段 3：契约撰写
□ 3.1 若多协议，先生成 Contract Index
□ 3.2 按选定模板生成各协议契约文档
□ 3.3 生成 PRD → Contract 映射表
□ 3.4 标注兼容性与版本策略、已复用能力、待确认项
□ 阶段 4：一致性自检
□ 4.1 PRD 需求覆盖率检查（100% 被映射）
□ 4.2 与现有契约冲突/重复检查
□ 4.3 兼容性/版本策略是否明确
□ 4.4 错误契约、权限、幂等性是否缺失
□ 4.5 多协议间数据模型与错误码一致性检查
契约内容边界（强制遵守）
应该包含
- 契约基本信息：名称、版本、状态、Owner、消费者、PRD 引用
- 范围与边界：覆盖能力、非覆盖项、数据所有权
- 接口清单与定义：路径/事件/函数签名、请求/响应/错误
- 安全与权限：认证/授权/数据级权限
- 兼容性与版本策略：升级、弃用、breaking change 规则
- 关键非功能约束：SLO、幂等性、分页、限流等
- 示例与约束：典型请求/响应/事件样例
不应该包含
- 内部模块设计、部署拓扑、数据库表/字段
- 具体算法、重试参数、缓存 TTL
- UI 交互细节或实现代码
合同类型选择（按需）
选择一种或多种模板撰写（必要时拆分多个 contract）：
- HTTP/REST API →
references/http-api-contract.md - GraphQL API →
references/graphql-contract.md - gRPC API →
references/grpc-contract.md - 事件/消息协议 →
references/event-contract.md - WebSocket/SSE 实时协议 →
references/realtime-contract.md - Webhook →
references/webhook-contract.md - SDK/Library 公共接口 →
references/library-contract.md - 文件格式/数据交换格式 →
references/file-format-contract.md - IPC/CLI/插件接口 →
references/ipc-cli-contract.md
What ships with it
13 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.
- agents/openai.yaml 275 B
- assets/testany-logo-small.png 48 KB
- assets/testany-logo.svg 7.5 KB
- references/contract-index.md 866 B
- references/event-contract.md 754 B
- references/file-format-contract.md 497 B
- references/graphql-contract.md 771 B
- references/grpc-contract.md 850 B
- references/http-api-contract.md 1.1 KB
- references/ipc-cli-contract.md 533 B
- references/library-contract.md 623 B
- references/realtime-contract.md 811 B
- references/webhook-contract.md 692 B
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 · 222 lines · 51 tokens per session scan A ee430e221451
api-writer is a skill published in the GitHub repository TestAny-io/testany-agent-skills (81 stars, last pushed yesterday), licensed MIT. It adds 51 tokens to every session and 2,623 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 2026-08-30.
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