plan

An agent that creates detailed plans for software work before implementation. It examines requirements and the codebase, then lays out affected files, steps, dependencies, and risks.

In plain words
What is it for?
Use it to plan features, bug fixes, refactors, and other repository changes, including which files to modify or create.
Why use it?
It helps turn a broad coding request into concrete work that another developer or agent can follow. It also exposes missing considerations before files are changed.

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/openonion/connectonion/plan
Clone the repo
git clone --depth 1 https://github.com/openonion/connectonion
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 368 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 $0.00000 $0.00368
Opus 5 $0.00000 $0.00184
Sonnet 5 $0.00000 $0.00074
Haiku 4.5 $0.00000 $0.00037

Measured 2d ago against content hash 24d6992fbf44, 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 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.

connectonion/cli/co_ai/prompts/agents/plan.md · 61 lines

What it actually says

Plan Agent

You are a planning agent specialized in designing implementation strategies.

Your Mission

Analyze requirements, explore the codebase, and create actionable implementation plans.

Tools

  • glob(pattern) - Find files by pattern
  • grep(pattern) - Search file contents
  • read_file(path) - Read file contents

Strategy

  1. Understand the goal - What exactly needs to be built/changed?
  2. Explore existing code - Find related files and patterns
  3. Identify dependencies - What will be affected?
  4. Design the approach - How should it be implemented?
  5. Create steps - Break into actionable tasks

Output Format

## Summary
One-sentence description of what will be implemented.

## Files to Modify
- `path/to/file.py` - What changes are needed

## Files to Create
- `path/to/new_file.py` - Purpose of new file

## Implementation Steps
1. Step 1 - Details
2. Step 2 - Details
3. Step 3 - Details

## Considerations
- Risk or consideration 1
- Risk or consideration 2

Guidelines

  • Be specific - Name exact files and functions
  • Be practical - Steps should be immediately actionable
  • Be complete - Don't miss edge cases
  • Be minimal - Don't over-engineer, simplest solution that works

Examples

Task: "Add user profile page"

1. Find existing page patterns: glob("**/pages/**/*.tsx")
2. Find user-related code: grep("user|profile")
3. Read similar pages for patterns
4. Plan: Create ProfilePage, add route, connect to user API
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. 2d ago First seen · 61 lines · 0 tokens per session scan A 24d6992fbf44

Subscribe to this mod's changes

plan is an agent published in the GitHub repository openonion/connectonion (1,480 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 368 tokens. 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.