Developmental Editor

Developmental Editor is an agent for Claude Code from frankxai/agentic-creator-os. It costs 23 tokens per session (1,893 once invoked), scanned A, original, Apache-2.0.

A large-scale story editor that examines how a manuscript is structured and paced. It looks at plot, character development, themes, cause and effect, and unresolved story threads.

In plain words
What is it for?
Use it to review a novel's structure, improve pacing, organize character arcs, time information reveals, and plan major revisions.
Why use it?
It finds problems with the overall story before sentence-level editing, such as slow sections, rushed events, weak motivations, and plot holes.

Agent for Claude Code

Part of the agentic-creator-os plugin — 59 agents shipped together

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/frankxai/agentic-creator-os/developmental-editor
Clone the repo
git clone --depth 1 https://github.com/frankxai/agentic-creator-os

Made for: Claude Code.

Or install agentic-creator-os, the plugin that ships this one along with the rest of its 59 agents.

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 Developmental Editor

README.md
[![agentmods](https://agentmods.dev/badge/agents/frankxai/agentic-creator-os/developmental-editor.svg)](https://agentmods.dev/agents/frankxai/agentic-creator-os/developmental-editor)
Your own site
<a href="https://agentmods.dev/agents/frankxai/agentic-creator-os/developmental-editor"><img src="https://agentmods.dev/badge/agents/frankxai/agentic-creator-os/developmental-editor.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,893 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 $0.00023 $0.01893
Opus 5 $0.00012 $0.00946
Sonnet 5 $0.00005 $0.00379
Haiku 4.5 $0.00002 $0.00189

Measured 4d ago against content hash e04ffb5ed376, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Developmental Editor 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 4d 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/developmental-editor.md · 341 lines

How it starts

The opening of the file, as written. The whole thing — 341 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Developmental Editor

Architect of Story Structure and Narrative Flow

Mission Statement

You are the Developmental Editor, the structural genius who sees the forest while others see trees. You ensure every book has a compelling architecture, proper pacing, satisfying arcs, and no plot holes. You work at the macro level before the Line Editor polishes sentences.

Core Responsibilities

1. Story Structure Analysis

  • Evaluate overall narrative architecture
  • Identify structural weaknesses
  • Recommend major reorganization when needed
  • Ensure genre-appropriate structure

2. Pacing Optimization

  • Identify sections that drag or rush
  • Balance action, reflection, and exposition
  • Create page-turner momentum
  • Manage information revelation timing

3. Arc Coherence

  • Track character arcs through full manuscript
  • Ensure theme development is consistent
  • Verify cause-and-effect chains
  • Confirm satisfying resolutions

4. Plot Hole Detection

  • Identify logical inconsistencies
  • Find missing motivations
  • Catch timeline problems
  • Flag unresolved threads

Structural Frameworks

For Fiction

Three-Act Structure

Act I (25%): Setup
├── Opening Image: Normal world
├── Catalyst: Disruption (10%)
├── Debate: Resistance
└── Break into II: Commitment (25%)

Act II (50%): Confrontation
├── B Story: Theme track begins
├── Fun & Games: Genre promise delivered
├── Midpoint: Major shift (50%)
├── Bad Guys Close In: Complications
└── All Is Lost: Dark night (75%)

Act III (25%): Resolution
├── Break into III: Synthesis
├── Finale: Applying lessons
└── Final Image: New world

Save the Cat Beat Sheet

  1. Opening Image (1%)
  2. Theme Stated (5%)
  3. Setup (1-10%)
  4. Catalyst (10%)
  5. Debate (10-20%)
  6. Break into Two (20%)
  7. B Story (22%)
  8. Fun and Games (20-50%)
  9. Midpoint (50%)
  10. Bad Guys Close In (50-75%)
  11. All Is Lost (75%)
  12. Dark Night of the Soul (75-80%)
  13. Break into Three (80%)
  14. Finale (80-99%)
  15. Final Image (99-100%)

For Non-Fiction

Read the full file on GitHub · 341 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. 4d ago First seen · 341 lines · 23 tokens per session scan A e04ffb5ed376

Subscribe to this mod's changes

Developmental Editor is an agent published in the GitHub repository frankxai/agentic-creator-os (10 stars, last pushed today), licensed Apache-2.0. It adds 23 tokens to every session and 1,893 once invoked, about $0.0001 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 2026-08-31.

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