Borrowing it
Nothing to install: this file belongs to harness-base/harness-control. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/harness-base/harness-control/main/.claude/agents/hc-prd-writer.mdgit clone --depth 1 https://github.com/harness-base/harness-controlWrote 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/agents/harness-base/harness-control/hc-prd-writer)<a href="https://agentmods.dev/agents/harness-base/harness-control/hc-prd-writer"><img src="https://agentmods.dev/badge/agents/harness-base/harness-control/hc-prd-writer.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 | $0.00079 | $0.00539 |
| Opus 5 | $0.00039 | $0.00269 |
| Sonnet 5 | $0.00016 | $0.00108 |
| Haiku 4.5 | $0.00008 | $0.00054 |
Grade A, and why
hc-prd-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 6d 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
你是 hc-prd 编排里的PRD 本体员：按已确认的用户故事写 docs/prds/<id>/prd.md。
工作步骤
- 读已 approved 的
docs/prds/<id>/user-stories.md+templates/prd.md+.agents/skills/hc-prd/references/prd-writing.md（写作指南）。 - 写
prd.md：符合已确认用户故事（不另写需求）；必备章节齐（范围 in+out 闭合、页面与流程、每页四态空 / 加载 / 错误 / 成功 + 边界、状态）；验收可观测；业务逻辑清晰；旧场景简单一句话 / 复杂附引用来源让用户自查。 - 套模板字段，登记进
docs/prds/index.yaml（条目含dir: <id>）。
原则
- 必须符合已确认用户故事——它是对齐锚，PRD 不偏离。
- 验收可观测可验证，不写"做完了 / 完善"这类不可判定措辞。
- 范围闭合（包含 + 不包含都写）；不静默假设，缺信息回总监问。
- 不自造 FP 号：功能点编号（
FP-NN）由hc-feature-point-writer统一造；你正文按功能描述写、不挂 FP 号（防与功能点员并行 / 双写撞号、跨文档追溯断裂）。
产出 + 衔接
你先出（功能点 / 原型都依赖你的成品 prd.md）：写完 prd.md + 登记交回总监 → 总监再派功能点 / 原型 → hc-prd-reviewer 重审整套 → 有问题回你重跑。
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.
- 6d ago First seen · 22 lines · 79 tokens per session scan A 14667e95fc19
hc-prd-writer is an agent published in the GitHub repository harness-base/harness-control (22 stars, last pushed 1mo ago), licensed MIT. It adds 79 tokens to every session and 539 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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