plan

A command for planning one phase of a software project, using project and roadmap files when available. It can also research the work, record discussion, or fill planning gaps.

In plain words
What is it for?
Use it to plan the current or a specified phase, create a roadmap when one is missing, skip optional research or discussion capture, or re-plan known gaps.
Why use it?
It turns a project definition or roadmap into a more specific plan for the next part of the work, and identifies when essential planning information is missing.

Command

Part of the shipyard plugin — 9 skills, 25 commands, 20 agents, 6 hooks shipped together

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 commands/lgbarn/shipyard/plan
Clone the repo
git clone --depth 1 https://github.com/lgbarn/shipyard

Or install shipyard, the plugin that ships this one along with the rest of its 9 skills, 25 commands, 20 agents, 6 hooks.

Per session 11 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,254 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 $0.00011 $0.03254
Opus 5 $0.00005 $0.01627
Sonnet 5 $0.00002 $0.00651
Haiku 4.5 $0.00001 $0.00325

Measured 3d ago against content hash 1ae030ba8757, 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 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.

commands/plan.md · 270 lines

How it starts

The opening of the file, as written. The whole thing — 270 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/shipyard:plan - Phase Planning

You are executing the Shipyard planning workflow. Follow these steps precisely.

Step 1: Parse Arguments

  • If a phase number is provided, use it.
  • If --skip-research is provided, skip the research step.
  • If --no-discuss is provided, skip the discussion capture step.
  • If --gaps is provided, this is a gap-filling re-plan (see note at bottom).
  • If no phase number is provided, read .shipyard/STATE.json to determine the current phase.

Step 1.5: Ensure ROADMAP.md Exists

Check if .shipyard/ROADMAP.md exists.

  • If it exists: Proceed to Step 2.

  • If .shipyard/PROJECT.md exists but no ROADMAP.md: Tell the user a roadmap is needed before planning. Dispatch an architect agent (subagent_type: "shipyard:architect") with the full PROJECT.md content to generate .shipyard/ROADMAP.md. Present the roadmap to the user for approval. Allow up to 3 revision cycles where the user can request changes. After approval (or 3 rounds), finalize and proceed to Step 2.

  • If neither PROJECT.md nor ROADMAP.md exists: Use AskUserQuestion to ask: "No project definition or roadmap found. What would you like to do?"

    • Run brainstorming first (Recommended) — Tell the user: "Run /shipyard:brainstorm to explore requirements and capture a project definition first." Then stop.
    • Create a minimal roadmap — Ask the user for a brief description of what they want to build. Dispatch an architect agent (subagent_type: "shipyard:architect") with that description to generate .shipyard/ROADMAP.md. Present for approval with up to 3 revision cycles. After approval, proceed to Step 2.
    • Cancel — Stop.

Step 2: Validate State

  1. Verify .shipyard/ exists. If not, tell the user to run /shipyard:init first.
  2. Read .shipyard/ROADMAP.md and locate the target phase.
  3. Read .shipyard/STATE.json for current context.
  4. If this phase already has plans and is not a --gaps run, ask the user if they want to re-plan (existing plans will be archived).

Read the full file on GitHub · 270 lines

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 · 270 lines · 11 tokens per session scan A 1ae030ba8757

Subscribe to this mod's changes

plan is a command published in the GitHub repository lgbarn/shipyard (65 stars, last pushed 1mo ago), licensed MIT. It adds 11 tokens to every session and 3,254 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 2026-08-30.