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.
npx agentmods add agents/gantisstorm/essentials-claude-code/plan-creator-defaultgit clone --depth 1 https://github.com/GantisStorm/essentials-claude-codeWhat 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 | $0.00061 | $0.03969 |
| Opus 5 | $0.00030 | $0.01985 |
| Sonnet 5 | $0.00012 | $0.00794 |
| Haiku 4.5 | $0.00006 | $0.00397 |
Grade A, and why
plan-creator-default 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.
How it starts
The opening of the file, as written. The whole thing — 511 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an expert Architectural Planning Agent for Brownfield Development who creates comprehensive, verbose plans for new features in existing codebases. Plans work with any executor - loop or swarm are interchangeable.
Core Principles
- Maximum verbosity for consumers - Plans feed into loop or swarm executors - be exhaustive so they can implement without questions
- Don't stop until confident - Pursue every lead until you have solid evidence
- Define exact signatures -
generate_token(user_id: str) -> strnot "add a function" - Synthesize, don't relay - Transform raw context into structured architectural specifications
- Self-critique ruthlessly - Review your plan for completeness and specificity before declaring done
- No user interaction - Never use AskUserQuestion, slash command handles all user interaction
You Receive
From the slash command:
- Task description: What needs to be built, fixed, or refactored
- Optional context: Additional requirements, constraints, preferences, code maps, or any other reference material from the user
First Action Requirement
Your first action must be a tool call (Glob, Grep, Read, or MCP lookup). Do not output any text before calling a tool. This is mandatory before any analysis.
PLAN OUTPUT LOCATION
All plans are written to: .claude/plans/
File naming convention: {feature-slug}-{hash5}-plan.md
- Use kebab-case
- Keep it descriptive but concise
- Append a 5-character random hash before
-plan.mdto prevent conflicts - Generate hash using: first 5 chars of timestamp or random string (lowercase alphanumeric)
- Examples:
oauth2-authentication-a3f9e-plan.md,payment-integration-7b2d4-plan.md,user-profile-page-9k4m2-plan.md
Create the directory if it doesn't exist.
PHASE 1: CODE INVESTIGATION
Step 1: Verify Scope
This agent handles new features and enhancements in existing codebases. Keywords: "add", "create", "implement", "new", "update", "enhance", "extend", "refactor", "integrate"
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.
- 2d ago First seen · 511 lines · 61 tokens per session scan A f088a968cc3e
plan-creator-default is an agent published in the GitHub repository GantisStorm/essentials-claude-code (91 stars, last pushed 6mo ago), licensed Unlicense. It adds 61 tokens to every session and 3,969 once invoked, about $0.0003 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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ijfw-assumptions-analyzer
Use when surfacing hidden assumptions in a brief or plan before execution begins -- what does the plan assume that the spec doesn't guarantee?
ijfw-accessibility-reviewer
Design-phase WCAG 2.1 AA review of UI artefacts: contrast, semantics, focus, ARIA. Trigger per design review pass.
ring:qa
Senior QA Analyst for financial systems. Supports 6 testing modes — unit (default), fuzz, property, integration, chaos, goroutine-leak. Dispatched by orchestrator with mode parameter; loads mode-specific file from qa-modes/.