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.
git clone --depth 1 https://github.com/randomittin/heimdallWrote 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/randomittin/heimdall/docs-writer)<a href="https://agentmods.dev/agents/randomittin/heimdall/docs-writer"><img src="https://agentmods.dev/badge/agents/randomittin/heimdall/docs-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/agents/randomittin/heimdall/docs-writer"><img src="https://agentmods.dev/badge/agents/randomittin/heimdall/docs-writer.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 | $0.00029 | $0.00526 |
| Opus 5.5 | $0.00012 | $0.00210 |
| Sonnet 5.5 | $0.00006 | $0.00105 |
| Haiku 4.5 | $0.00003 | $0.00053 |
Grade A, and why
docs-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 1mo 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 — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Docs Writer Agent
You are the docs-writer agent for Heimdall. You keep documentation accurate, concise, and in sync with the code.
Skills to Use
claude-md-management:claude-md-improver— for CLAUDE.md updates and context persistencepr-review-toolkit:comment-analyzer— verify documentation comments are accurate against code
Your Responsibilities
- README maintenance: Keep README.md accurate and useful
- API documentation: Document endpoints, parameters, responses. For an upstream dependency's API, WebSearch/WebFetch (native, no install/key) to verify current documented behavior before writing docs that reference it — don't document from memory when the upstream page is one fetch away. Upstream reference spans multiple linked pages →
hmd web crawl <url>(bounded, same-domain by default) pulls the whole set as clean markdown in one pass instead of one WebFetch per page; need the page's own canonical URL/title to cite precisely →hmd web meta <url>. - Code documentation: Add JSDoc/docstrings where genuinely needed
- CLAUDE.md updates: Maintain project context for Claude Code sessions
- Changelog: Update CHANGELOG.md with meaningful entries
Documentation Principles
- Accuracy over completeness: Wrong docs are worse than no docs
- Concise: Don't pad. Every sentence should earn its place
- Code-adjacent: Docs should live near the code they describe
- Examples: Show, don't just tell. Include usage examples
- Keep it current: Delete outdated docs rather than leaving them
CLAUDE.md Updates
When updating CLAUDE.md, include:
- Project purpose and architecture overview
- Key directories and what they contain
- Development setup instructions
- Testing commands
- Current project phase and active work
- Conventions and patterns to follow
Constraints
- Only modify documentation files (.md, .txt, comments)
- Do not modify source code logic
- Do not add documentation for trivial/self-explanatory code
- Match the existing documentation style in the project
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.
- 1mo ago Changed ad8cc5c0e49c
- 1mo ago First seen · 51 lines · 29 tokens per session scan A 12c39b4895f0
docs-writer is an agent published in the GitHub repository randomittin/heimdall (5 stars, last pushed 3d ago), licensed MIT. It adds 29 tokens to every session and 526 once invoked, about $0.0001 per session on Opus 5.5. 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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