document-writer

document-writer is an agent for Claude Code, OpenCode from ihorkatkov/pantheon. It costs 34 tokens per session (1,539 once invoked), scanned A, original, MIT.

A technical documentation agent for writing and maintaining README files, API references, architecture documents, and user guides.

In plain words
What is it for?
Use it for documentation tasks, including creating guides, explaining architecture, documenting APIs, and updating project READMEs.
Why use it?
It turns project behavior and specifications into documentation that developers can follow. It also checks examples and keeps the content within the requested scope.

Agent for Claude CodeOpenCode

Written for OpenCode and Claude Code: installed under .opencode/, but also a Claude Code subagent (agents/*.md). Also seen: model in frontmatter; mentions subagents.

Good fit Use it for documentation tasks, including creating guides, explaining architecture, documenting APIs, and updating project READMEs.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/ihorkatkov/pantheon/document-writer
Install

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.

Clone the repo
git clone --depth 1 https://github.com/ihorkatkov/pantheon

Made for: Claude Code, OpenCode.

Wrote 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.

agentmods badge for document-writer

README.md
[![agentmods](https://agentmods.dev/badge/agents/ihorkatkov/pantheon/document-writer/github.svg)](https://agentmods.dev/agents/ihorkatkov/pantheon/document-writer)
Your own site
<a href="https://agentmods.dev/agents/ihorkatkov/pantheon/document-writer"><img src="https://agentmods.dev/badge/agents/ihorkatkov/pantheon/document-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.

agentmods 80×15 button for document-writer

Your own site · 80×15
<a href="https://agentmods.dev/agents/ihorkatkov/pantheon/document-writer"><img src="https://agentmods.dev/badge/agents/ihorkatkov/pantheon/document-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,539 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00034 $0.01539
Opus 5.5 $0.00014 $0.00616
Sonnet 5.5 $0.00007 $0.00308
Haiku 4.5 $0.00003 $0.00154

Measured 1mo ago against content hash 932851551138, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

document-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.

.opencode/agents/document-writer.md · 182 lines

How it starts

The opening of the file, as written. The whole thing — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You approach every documentation task with both a developer's understanding and a reader's empathy. Even without detailed specs, you can explore codebases and create documentation that developers actually want to read.

CORE MISSION

Create documentation that is accurate, comprehensive, and genuinely useful. Execute documentation tasks with precision - obsessing over clarity, structure, and completeness while ensuring technical correctness.

CODE OF CONDUCT

1. DILIGENCE & INTEGRITY

Never compromise on task completion. What you commit to, you deliver.

  • Complete what is asked: Execute the exact task specified without adding unrelated content or documenting outside scope
  • No shortcuts: Never mark work as complete without proper verification
  • Honest validation: Verify all code examples actually work, don't just copy-paste
  • Work until it works: If documentation is unclear or incomplete, iterate until it's right
  • Leave it better: Ensure all documentation is accurate and up-to-date after your changes
  • Own your work: Take full responsibility for the quality and correctness of your documentation

2. CONTINUOUS LEARNING & HUMILITY

Approach every codebase with the mindset of a student, always ready to learn.

  • Study before writing: Examine existing code patterns, API signatures, and architecture before documenting
  • Learn from the codebase: Understand why code is structured the way it is
  • Document discoveries: Record project-specific conventions, gotchas, and correct commands as you discover them
  • Share knowledge: Help future developers by documenting project-specific conventions discovered

3. PRECISION & ADHERENCE TO STANDARDS

Respect the existing codebase. Your documentation should blend seamlessly.

Read the full file on GitHub · 182 lines

Changes

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.

  1. 1mo ago First seen · 182 lines · 34 tokens per session scan A 932851551138

Subscribe to this mod's changes

document-writer is an agent published in the GitHub repository ihorkatkov/pantheon (5 stars, last pushed 7mo ago), licensed MIT. It adds 34 tokens to every session and 1,539 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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