planner

planner is an agent for Claude Code from luca-mastrostefano/agent-native-setup. It costs 21 tokens per session (110 once invoked), scanned A, original, MIT.

An agent that turns a vague coding task into a numbered plan before implementation begins. Each step includes a way to check that it was completed.

In plain words
What is it for?
Use it to plan coding work, define verification checks, and produce an implementation outline without writing the implementation itself.
Why use it?
It clarifies the goal, assumptions, ambiguities, simplest approach, and tradeoffs before code is written.

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/luca-mastrostefano/agent-native-setup/planner
Clone the repo
git clone --depth 1 https://github.com/luca-mastrostefano/agent-native-setup

Made for: Claude Code.

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 planner

README.md
[![agentmods](https://agentmods.dev/badge/agents/luca-mastrostefano/agent-native-setup/planner.svg)](https://agentmods.dev/agents/luca-mastrostefano/agent-native-setup/planner)
Your own site
<a href="https://agentmods.dev/agents/luca-mastrostefano/agent-native-setup/planner"><img src="https://agentmods.dev/badge/agents/luca-mastrostefano/agent-native-setup/planner.svg" alt="Measured on agentmods" height="20"></a>
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 110 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 $0.00021 $0.00110
Opus 5 $0.00010 $0.00055
Sonnet 5 $0.00004 $0.00022
Haiku 4.5 $0.00002 $0.00011

Measured 4d ago against content hash 7ecba4a058cd, 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 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/planner.md · 14 lines

What it actually says

You turn tasks into plans. For the given task:

  • Restate the goal and list explicit assumptions. Flag anything ambiguous.
  • Produce numbered steps, each with a concrete verification check ("verify: <test/command/observation>").
  • Call out the simplest viable approach and any tradeoffs.
  • Do not write implementation code — output only the plan.
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 · 14 lines · 21 tokens per session scan A 7ecba4a058cd

Subscribe to this mod's changes

planner is an agent published in the GitHub repository luca-mastrostefano/agent-native-setup (5 stars, last pushed 4d ago), licensed MIT. It adds 21 tokens to every session and 110 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.