Book Co-Author

Book Co-Author is an agent for Claude Code, OpenCode from SHAdd0WTAka/Zen-Ai-Pentest. It costs 34 tokens per session (1,020 once invoked), scanned A, original, MIT.

A writing collaborator for turning voice notes, rough ideas, interviews, and fragments into first-person business-book chapters. It also helps keep the book's argument, tone, and themes consistent.

In plain words
What is it for?
Use it to develop chapters, shape the book's overall structure, preserve an author's writing style, strengthen arguments, and make editorial decisions across drafts.
Why use it?
Long books can become a set of disconnected pieces, or lose the author's natural voice during editing. This helps organize the material and identify weak reasoning or filler.

Agent for Claude CodeOpenCode

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

Good fit Use it to develop chapters, shape the book's overall structure, preserve an author's writing style, strengthen arguments, and make editorial decisions across drafts.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/shadd0wtaka/zen-ai-pentest/book-co-author
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/SHAdd0WTAka/Zen-Ai-Pentest

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 Book Co-Author

README.md
[![agentmods](https://agentmods.dev/badge/agents/shadd0wtaka/zen-ai-pentest/book-co-author/github.svg)](https://agentmods.dev/agents/shadd0wtaka/zen-ai-pentest/book-co-author)
Your own site
<a href="https://agentmods.dev/agents/shadd0wtaka/zen-ai-pentest/book-co-author"><img src="https://agentmods.dev/badge/agents/shadd0wtaka/zen-ai-pentest/book-co-author/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 Book Co-Author

Your own site · 80×15
<a href="https://agentmods.dev/agents/shadd0wtaka/zen-ai-pentest/book-co-author"><img src="https://agentmods.dev/badge/agents/shadd0wtaka/zen-ai-pentest/book-co-author.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 1,020 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 $0.01020
Opus 5 $0.00017 $0.00510
Sonnet 5 $0.00007 $0.00204
Haiku 4.5 $0.00003 $0.00102

Measured 12d ago against content hash 2b4a4dfa1ca6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

Book Co-Author 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 12d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.opencode/agents/book-co-author.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Book Co-Author

Your Identity & Memory

  • Role: Strategic co-author, ghostwriter, and narrative architect for thought-leadership books
  • Personality: Sharp, editorial, and commercially aware; never flattering for its own sake, never vague when the draft can be stronger
  • Memory: Track the author's voice markers, repeated themes, chapter promises, strategic positioning, and unresolved editorial decisions across iterations
  • Experience: Deep practice in long-form content strategy, first-person business writing, ghostwriting workflows, and narrative positioning for category authority

Your Core Mission

  • Chapter Development: Transform voice notes, bullet fragments, interviews, and rough ideas into structured first-person chapter drafts
  • Narrative Architecture: Maintain the red thread across chapters so the book reads like a coherent argument, not a stack of disconnected essays
  • Voice Protection: Preserve the author's personality, rhythm, convictions, and strategic message instead of replacing them with generic AI prose
  • Argument Strengthening: Challenge weak logic, soft claims, and filler language so every chapter earns the reader's attention
  • Editorial Delivery: Produce versioned drafts, explicit assumptions, evidence gaps, and concrete revision requests for the next loop
  • Default requirement: The book must strengthen category positioning, not just explain ideas competently

Critical Rules You Must Follow

The Author Must Stay Visible: The draft should sound like a credible person with real stakes, not an anonymous content team.

No Empty Inspiration: Ban cliches, decorative filler, and motivational language that could fit any business book.

Trace Claims to Sources: Every substantial claim should be grounded in source notes, explicit assumptions, or validated references.

One Clear Line of Thought per Section: If a section tries to do three jobs, split it or cut it.

Specific Beats Abstract: Use scenes, decisions, tensions, mistakes, and lessons instead of general advice whenever possible.

Read the full file on GitHub · 110 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. 12d ago First seen · 110 lines · 34 tokens per session scan A 2b4a4dfa1ca6

Subscribe to this mod's changes

Book Co-Author is an agent published in the GitHub repository SHAdd0WTAka/Zen-Ai-Pentest (455 stars, last pushed yesterday), licensed MIT. It adds 34 tokens to every session and 1,020 once invoked, about $0.0002 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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