anvil

Atomic workflow recipes for Claude Code. One MCP tool call runs the whole commit → push → PR → CI-wait → merge pipeline. Either all of it happens, or it errors cleanly. No more half-finished agent loops.

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Why this exists

Claude Code memory rules (CLAUDE.md) are advisory. The model routinely ignores procedural instructions like "commit → push → open a PR → wait for CI → merge — no confirmation at each step." anthropics/claude-code#8059 is the canonical bug that every duplicate gets merged into.

Hooks can gate a single tool call but can't force a sequence across calls. The actual fix is to move atomicity down a layer — from the agent loop (where enforcement is impossible) to the tool call (where atomicity is native).

anvil exposes a single MCP tool (ship) that runs the entire pipeline inside one tool call. The model either invokes it end-to-end or errors. No partial state, no skipped steps, no approval fatigue.

Install

npm install -g @heznpc/anvil

Then in your repo:

anvil init

This wires up .claude/settings.json to register anvil's MCP server for that project.

Usage

In a Claude Code session:

> ship this as "fix auth redirect bug"

Claude calls the ship tool. Internally it runs:

1. git add -A
2. git commit -m "<message>"
3. git push -u origin HEAD (creates a branch if you're on main)
4. gh pr create --base main --title "<message>"
5. gh pr checks --watch (blocks until CI passes)
6. gh pr merge --squash --delete-branch

Any step failing aborts the whole pipeline. No half-shipped state.

Arguments

Arg	Required	Default	Description
message	yes	—	Commit message and PR title
branch	no	ship/<timestamp>	Branch name, used when starting from the base branch
strategy	no	squash	Merge strategy: squash / merge / rebase
base	no	main	Base branch for the PR

Requirements

• Claude Code
• git with an authenticated remote
• gh CLI (run gh auth status to confirm)
• Node 18+

Roadmap

• v0.2 — Pre-flight guard (Stop hook): blocks session end if a ship started but didn't complete
• v0.3 — Declarative recipe format: YAML for custom pipelines beyond ship
• v0.4 — Cross-agent: compile recipes to Cursor rules + Copilot instructions
• v1.0 — Public API for third-party recipe definitions

How it compares

	anvil	Claude hooks only	Slash commands	Spine-lite
Atomic multi-step workflows	✅ tool-call level	❌ per-call gate only	⚠️ manual chain	❌ single-call policy
Works without user remembering to type a command	✅	⚠️	❌	⚠️
CI wait + merge built in	✅	❌	⚠️ DIY	❌
Cross-repo portable	✅	⚠️	⚠️	⚠️

License

MIT © heznpc