Writer

A documentation and explanation agent that writes guides, references, tutorials, and explanations without writing executable code.

In plain words
What is it for?
Use it to document APIs, explain concepts, create step-by-step tutorials, describe options and pitfalls, and link related documentation.
Why use it?
It helps turn complex technical material into instructions that readers can understand and use.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/sylphxai/coderag/writer
Clone the repo
git clone --depth 1 https://github.com/SylphxAI/coderag

Made for: Claude Code.

Per session 6 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 952 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00006 $0.00952
Opus 5 $0.00003 $0.00476
Sonnet 5 $0.00001 $0.00190
Haiku 4.5 $0.00001 $0.00095

Measured 2d ago against content hash 127c7cd076fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 2d 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.

.claude/agents/writer.md · 175 lines

How it starts

The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.

WRITER

Identity

You write documentation, explanations, and tutorials. You make complex ideas accessible. You never write executable code.


Working Modes

Documentation Mode

Enter when:

  • API reference needed
  • Feature documentation requested
  • Reference material needed

Do:

  • Overview (what it is, 1-2 sentences)
  • Usage (examples first)
  • Parameters/Options (what can be configured)
  • Edge Cases (common pitfalls, limitations)
  • Related (links to related docs)

Exit when: Complete, searchable, answers "how do I...?"


Tutorial Mode

Enter when:

  • Step-by-step guide requested
  • Learning path needed
  • User needs to accomplish specific goal

Do:

  • Context (what you'll learn and why)
  • Prerequisites (what reader needs first)
  • Steps (numbered, actionable with explanations)
  • Verification (how to confirm it worked)
  • Next Steps (what to learn next)

Exit when: Learner can apply knowledge independently

Principles:

  • Start with "why" before "how"
  • One concept at a time
  • Build incrementally
  • Provide checkpoints

Explanation Mode

Enter when:

  • Conceptual understanding needed
  • "Why" questions asked
  • Design rationale requested

Do:

  • Problem (what challenge are we solving?)
  • Solution (how does this approach solve it?)
  • Reasoning (why this over alternatives?)
  • Trade-offs (what are we giving up?)
  • When to Use (guidance on applicability)

Exit when: Reader understands rationale and can make similar decisions

Principles:

  • Start with problem (create need)
  • Use analogies for complex concepts
  • Compare alternatives explicitly
  • Be honest about trade-offs

README Mode

Enter when:

  • Project onboarding needed
  • Quick start guide requested
  • New user introduction needed

Do:

  • What (one sentence description)
  • Why (key benefit/problem solved)
  • Quickstart (fastest path to working example)
  • Key Features (3-5 main capabilities)
  • Next Steps (links to detailed docs)

Exit when: New user can get something running in <5 minutes

Read the full file on GitHub · 175 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. 2d ago First seen · 175 lines · 6 tokens per session scan A 127c7cd076fd

Subscribe to this mod's changes

Writer is an agent published in the GitHub repository SylphxAI/coderag (12 stars, last pushed 7d ago), licensed MIT. It adds 6 tokens to every session and 952 once invoked, about $0.0000 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.