rollback

A command workflow for returning a project to an earlier Shipyard checkpoint, which is a saved Git tag representing a previous state. It verifies the project and lists available checkpoints before selecting one.

In plain words
What is it for?
Use it to inspect available Shipyard checkpoints or restore the project to a chosen checkpoint after a plan or build has caused unwanted changes.
Why use it?
It provides a defined way to undo later Shipyard changes without guessing which saved version to use. It also explains what to do when no checkpoints exist.

Command

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/rollback
Clone the repo
git clone --depth 1 https://github.com/lgbarn/shipyard
Per session 8 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 753 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 $0.00008 $0.00753
Opus 5 $0.00004 $0.00377
Sonnet 5 $0.00002 $0.00151
Haiku 4.5 $0.00001 $0.00075

Measured 2d ago against content hash 117a546d7669, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

rollback 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.

commands/rollback.md · 109 lines

How it starts

The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/shipyard:rollback - Checkpoint Rollback

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

Step 1: Verify State

  1. Verify .shipyard/ exists. If not, tell the user there is nothing to roll back.
  2. Verify this is a git repository with at least one commit.

Step 2: List Checkpoints

Run git tag -l "shipyard-checkpoint-*" --sort=-version:refname to find all checkpoints.

  • If --list was passed, display checkpoints with dates and labels, then stop.
  • If no checkpoints exist, inform the user:

    "No Shipyard checkpoints found. Checkpoints are created automatically during /shipyard:plan and /shipyard:build."

Step 3: Select Checkpoint

  • If a specific checkpoint tag was provided, use it. Verify it exists with git tag -l.
  • If no argument, show the 5 most recent checkpoints and ask the user to select one:
Available Checkpoints
═════════════════════

1. shipyard-checkpoint-post-build-phase-2-20260131T...
2. shipyard-checkpoint-pre-build-phase-2-20260131T...
3. shipyard-checkpoint-post-plan-phase-2-20260130T...
4. shipyard-checkpoint-post-build-phase-1-20260130T...
5. shipyard-checkpoint-pre-build-phase-1-20260130T...

Select a checkpoint (1-5):

Step 4: Choose Rollback Scope

Ask the user:

"What scope should the rollback cover?"

  1. State only — Revert .shipyard/ files only (plans, state, roadmap). Code stays as-is.
  2. Full rollback — Revert both .shipyard/ state AND code changes back to the checkpoint.

Step 5: Create Safety Checkpoint

Before any rollback, create a safety checkpoint:

Follow Checkpoint Protocol (create a named git tag for rollback safety at key pipeline stages; see docs/PROTOCOLS.md) -- create pre-rollback checkpoint.

This ensures the current state can be recovered if the rollback was a mistake.

Step 6: Execute Rollback

State-only rollback:

git checkout <checkpoint-tag> -- .shipyard/

Read the full file on GitHub · 109 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. 2d ago First seen · 109 lines · 8 tokens per session scan A 117a546d7669

Subscribe to this mod's changes

rollback is a command published in the GitHub repository lgbarn/shipyard (65 stars, last pushed 1mo ago), licensed MIT. It adds 8 tokens to every session and 753 once invoked, about $0.0000 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.