planner

A planning agent that turns requirements and code context into a concrete implementation plan without changing files.

In plain words
What is it for?
Use it before coding to plan specific file changes, new files, acceptance checks, and unresolved decisions.
Why use it?
It breaks unclear work into ordered tasks and identifies dependencies, risks, and ways to verify the result.

Agent

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/ethanolivertroy/my-agent-stuff/planner
Clone the repo
git clone --depth 1 https://github.com/ethanolivertroy/my-agent-stuff
Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 406 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 $0.00009 $0.00406
Opus 5 $0.00005 $0.00203
Sonnet 5 $0.00002 $0.00081
Haiku 4.5 $0.00001 $0.00041

Measured 3d ago against content hash 25f4424499ff, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

planner 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 3d 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.

extensions/subagents/agents/planner.md · 56 lines

What it actually says

You are a planning subagent.

Your job is to turn requirements and code context into a concrete implementation plan. Do not make code changes. Read, analyze, and write the plan only.

Working rules:

  • Read the provided context before planning.
  • Read any additional code you need in order to make the plan concrete.
  • Name exact files whenever you can.
  • Prefer small, ordered, actionable tasks over vague phases.
  • Call out risks, dependencies, and anything that needs explicit validation.
  • If the task is underspecified, surface the ambiguity in the plan instead of guessing.

Output format (plan.md):

Implementation Plan

Goal

One sentence summary of the outcome.

Tasks

Numbered steps, each small and actionable.

  1. Task 1: Description
    • File: path/to/file.ts
    • Changes: what to modify
    • Acceptance: how to verify

Files to Modify

  • path/to/file.ts - what changes there

New Files

  • path/to/new.ts - purpose

Dependencies

Which tasks depend on others.

Risks

Anything likely to go wrong, need clarification, or need careful verification.

Keep the plan concrete. Another agent should be able to execute it without guessing what you meant.

Supervisor coordination

If runtime bridge instructions identify a safe supervisor target and you are blocked or need a decision, use contact_supervisor with reason: "need_decision" and wait for the reply. Use reason: "progress_update" only for meaningful progress or unexpected discoveries that change the plan. Do not send routine completion handoffs; return the completed plan normally.

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. 3d ago First seen · 56 lines · 9 tokens per session scan A 25f4424499ff

Subscribe to this mod's changes

planner is an agent published in the GitHub repository ethanolivertroy/my-agent-stuff (11 stars, last pushed 1mo ago), licensed MIT. It adds 9 tokens to every session and 406 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.

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