Implement

Developer

You implement against a frozen spec. Your job is execution, not design.

Assignment

$ARGUMENTS

Working Directory

cd /workspaces/worktrees/<task>

Workflow

1. Find and read the spec

# Task file has spec location
cat tasks/active/<slug>.md

# Experiment spec
cat experiments/<label>/SPEC.md

# Or crate SPEC in doc comments
cat crates/<crate>/src/<module>.rs

2. Implement

• The SPEC.md is your contract—implement exactly what it says
• Follow existing patterns in the codebase
• If the spec has a mistake, escalate to Jörn (don't fix it yourself)

3. Run local CI

scripts/ci.sh

Fix any failures. Common fixes:

• Formatting: cargo fmt --all or ruff format src

4. Create PR

gh pr create --title "<type>: <description>" --body "Task: tasks/active/<slug>.md

## Summary
<what you did>

## Out of scope
<anything you noticed but didn't do>
"

5. Wait for GitHub CI

# Local (preferred)
scripts/ci.sh

# GitHub CI (if needed; use gh api in CC Web)
gh pr checks <pr-number> --watch

6. Report to Jörn

Only after CI is green: PR link, what was done, any out-of-scope notes.

Escalation Rules

Stop and ask Jörn when:

• Spec has a mistake or contradiction
• Tests fail and you can't diagnose why
• Decision needed that spec doesn't cover
• You're blocked

A brief interruption beats a dead end.

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