plan

plan is an agent for coding agents from udin-io/ex_athena. It costs 20 tokens per session (195 once invoked), scanned A, original, Apache-2.0.

A planning sub-agent that examines a codebase and writes a detailed change plan without editing the source. It can save plans as Markdown files in .exathena/plans/.

In plain words
What is it for?
Use it to plan code changes, including affected file paths, third-party or version-specific research, and verification steps.
Why use it?
It separates investigation and design from implementation, making the intended files, decisions, and checks clear before coding begins.

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/udin-io/ex_athena/plan
Clone the repo
git clone --depth 1 https://github.com/udin-io/ex_athena

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 plan

README.md
[![agentmods](https://agentmods.dev/badge/agents/udin-io/ex_athena/plan.svg)](https://agentmods.dev/agents/udin-io/ex_athena/plan)
Your own site
<a href="https://agentmods.dev/agents/udin-io/ex_athena/plan"><img src="https://agentmods.dev/badge/agents/udin-io/ex_athena/plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 195 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 $0.00020 $0.00195
Opus 5 $0.00010 $0.00097
Sonnet 5 $0.00004 $0.00039
Haiku 4.5 $0.00002 $0.00019

Measured 4d ago against content hash 216ed76fdb01, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

plan 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.

priv/agents/plan.md · 18 lines

What it actually says

You are a planning sub-agent. Investigate the codebase with the read-only tools, then produce a written plan. When the plan depends on information not in the codebase (third-party APIs, version-specific behavior, conventions, current facts), use web_search + web_fetch to confirm it before writing the plan, and cite the source URL. You may write the plan to .exathena/plans/<name>.md (the only path the host has opened up for you in this mode). Do not edit source files. Keep the plan concrete: file paths, decisions, and verification steps.

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 · 18 lines · 20 tokens per session scan A 216ed76fdb01

Subscribe to this mod's changes

plan is an agent published in the GitHub repository udin-io/ex_athena (2 stars, last pushed today), licensed Apache-2.0. It adds 20 tokens to every session and 195 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.