agtx-plan

agtx-plan is a skill for Claude Code, Codex from fynnfluegge/agtx. It costs 41 tokens per session (419 once invoked), scanned A, original, Apache-2.0.

A planning command for an agtx task. It reads the task description, examines the codebase, writes an implementation plan to `.agtx/plan.md`, and then waits for approval before changes are made.

In plain words
What is it for?
Fetching an agtx task, researching the repository, documenting the proposed implementation, and stopping for approval.
Why use it?
It turns a task into a documented plan with affected files, implementation steps, and risks before anyone edits the project. This gives the user a chance to review the approach first.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Part of the agtx plugin — 7 skills, 1 command, 1 MCP server shipped together

Good fit Fetching an agtx task, researching the repository, documenting the proposed implementation, and stopping for approval.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/fynnfluegge/agtx/agtx-plan
About the project

agtx is a terminal-based shared workspace where multiple coding agents coordinate through a task board. Developers use it to delegate work, run agents in parallel across git worktrees, and move tasks through different workflow phases.

fynnfluegge/agtx · 1,503 stars · on GitHub

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.

Any agent
npx skills add fynnfluegge/agtx --skill agtx-plan
Clone the repo
git clone --depth 1 https://github.com/fynnfluegge/agtx

Made for: Claude Code, Codex.

Or install agtx, the plugin that ships this one along with the rest of its 7 skills, 1 command, 1 MCP server.

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 agtx-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/fynnfluegge/agtx/agtx-plan/github.svg)](https://agentmods.dev/skills/fynnfluegge/agtx/agtx-plan)
Your own site
<a href="https://agentmods.dev/skills/fynnfluegge/agtx/agtx-plan"><img src="https://agentmods.dev/badge/skills/fynnfluegge/agtx/agtx-plan/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for agtx-plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/fynnfluegge/agtx/agtx-plan"><img src="https://agentmods.dev/badge/skills/fynnfluegge/agtx/agtx-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 419 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00041 $0.00419
Opus 5 $0.00020 $0.00210
Sonnet 5 $0.00008 $0.00084
Haiku 4.5 $0.00004 $0.00042

Measured 11d ago against content hash aecc3cbee416, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

agtx-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 11d 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.

plugins/agtx-terse/skills/agtx-plan/SKILL.md · 51 lines

What it actually says

Planning Phase

You are in the planning phase of an agtx-managed task.

Input

The argument to this command is a task ID. Fetch the task description using the agtx MCP tool:

mcp__agtx__get_task(task_id: "<the id passed to this command>")

Use the description field as the task to work on. Also check for .agtx/research.md if a research phase was completed first.

Instructions

  1. Fetch the task description via get_task
  2. If .agtx/research.md exists, read it for prior analysis
  3. Explore the codebase to understand relevant files, patterns, and architecture
  4. Identify all files that need to be created or modified
  5. Create a detailed implementation plan

Output

Write your plan to .agtx/plan.md in the current working directory (do NOT navigate up — write directly to .agtx/plan.md relative to where you are now) with these sections:

Analysis

What you found in the codebase — relevant files, patterns, dependencies.

Plan

Step-by-step implementation plan — files to modify, approach, order of changes.

Risks

What could go wrong — edge cases, breaking changes, areas needing extra care.

CRITICAL: Stop After Writing

After writing .agtx/plan.md (in the current working directory):

  • Do NOT start implementing
  • Do NOT modify any source files
  • Say: "Plan written to .agtx/plan.md. Waiting for approval."
  • Wait for explicit instructions to proceed

Output Style

Terse. No pleasantries. Fragments OK. Short synonyms. Code exact. Status updates: one line. Pattern: [what] [why]. Done.

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. 11d ago First seen · 51 lines · 41 tokens per session scan A aecc3cbee416

Subscribe to this mod's changes

agtx-plan is a skill published in the GitHub repository fynnfluegge/agtx (1,503 stars, last pushed today), licensed Apache-2.0. It adds 41 tokens to every session and 419 once invoked, about $0.0002 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.