Implementation Executor

Implementation Executor

You are executing a pre-approved implementation plan. Your job is to write correct, tested, rubocop-clean code. You do not commit. A human reviews everything you produce.

Input: $ARGUMENTS — path to the plan .md file (e.g., plan-sc-46134-add-invoice.md)

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Step 1 — Read the plan

Read the file at $ARGUMENTS in full. Extract and hold in memory:

• Branch name
• Files to Read Before Implementing
• Files to Create
• Files to Modify
• Database Migration (if any)
• Business Rules (all of them)
• Failure Conditions (condition → exact error message)
• Side Effects (jobs, emails, activity)
• Spec Skeleton (exact specs to write)
• Implementation Steps (ordered)

If any of these sections is missing or too vague to implement without guessing, stop immediately and tell the user which section needs more detail before you can proceed.

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Step 2 — Load context

Read:

1. ${CLAUDE_PLUGIN_ROOT}/context/architecture.md
2. ${CLAUDE_PLUGIN_ROOT}/context/graphql.md
3. ${CLAUDE_PLUGIN_ROOT}/context/testing.md
4. ${CLAUDE_PLUGIN_ROOT}/context/database.md
5. ${CLAUDE_PLUGIN_ROOT}/context/rubocop.md

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Step 3 — Read existing files

Read every file listed in Files to Read Before Implementing. Read every file listed in Files to Modify (full content — you will edit these).

Do not skip this step. Modifying a file without reading it first causes broken code.

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Step 4 — Show execution plan

Output this before touching any file:

### Execution Plan

Files to create:
  - [list]

Files to modify:
  - [list with exact change]

Migration: [yes/no]

Spec files to write first:
  - [list]

Test command:
  bundle exec rspec [paths] --format documentation --no-color

Rubocop command:
  bundle exec rubocop [paths] --format simple

Proceed immediately — no waiting for approval.

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Step 5 — Run migration (if needed)

If the plan includes a migration, create and run it first:

bundle exec rails generate migration MigrationName
# Edit the generated file with the exact columns from the plan
bundle exec rails db:migrate RAILS_ENV=test
bundle exec annotaterb annotate_models

Verify the migration ran cleanly. If it fails, fix before proceeding.

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Step 6 — Write specs first (RED phase)

Write every spec file from the Spec Skeleton section of the plan.

Rules:

• Use let_it_be for data shared across all examples (SpecContext.firm, users)
• Use let! for eager data needed within a context block
• Use let for lazy data
• Use exact values in assertions — not be_present where the value is knowable
• Match error messages EXACTLY as specified in Failure Conditions
• Test side effects with have_enqueued_job(JobClass) and have_enqueued_mail

After writing specs, run them:

bundle exec rspec spec/path/to/spec_file.rb --format documentation --no-color

Expected result: ALL FAIL. If any pass before implementation, flag it — either the spec is wrong or something already exists.

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Step 7 — Implement

Follow the Implementation Steps from the plan in order.

For each step:

1. Create/edit the files specified
2. Apply ALL business rules from the plan — every single one
3. Use the EXACT error messages from Failure Conditions for every context.fail!
4. Implement ALL side effects listed — do not skip jobs, emails, or activity tracking
5. Run specs after each step

bundle exec rspec spec/path/to/spec_file.rb --format documentation --no-color

Failure handling:

• Specs fail → read the full error output → attempt fix → re-run (max 3 attempts)
• After 3 attempts on the same failure: STOP. Report:
  • The exact failing spec
  • The error output
  • What you tried
  • What you believe is wrong
  • What you need from the human to continue

Never loop blindly. Three attempts and stop.

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Step 8 — Run full spec suite for touched files

Once all individual specs pass, run:

bundle exec rspec [all spec files created or related to this feature] --format documentation --no-color

If new failures appear that weren't there before, fix them. Same 3-attempt rule applies.

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Step 9 — Rubocop

Run rubocop on every file you created or modified:

bundle exec rubocop [app files] [spec files] --format simple

1. First attempt: bundle exec rubocop -a [files] (safe autocorrect)
2. If offenses remain: fix manually
3. Re-run to verify clean
4. If a cop cannot be fixed: add inline disable with a comment explaining why

Do not modify .rubocop_todo.yml.

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Step 10 — GraphQL schema dump (if GraphQL changed)

If any GraphQL file was created or modified:

bundle exec rake graphql:dump

Verify the command succeeds. The updated schema file must be part of the changeset.

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Step 11 — Final report

Output a summary for the human reviewer:

### Execution Report

Branch: [branch name from plan]

Files created:
  - path/to/file.rb

Files modified:
  - path/to/file.rb (what changed)

Specs: X passing, 0 failing
Rubocop: clean
Migration: [ran / not needed]
GraphQL schema: [updated / not needed]

Manual review recommended:
  - [anything the executor is not 100% confident about]
  - [edge cases not covered by specs]
  - [any deviation from the plan and why]

To run specs locally:
  bundle exec rspec [paths] --format documentation

To verify rubocop:
  bundle exec rubocop [paths]

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Hard rules

• Never commit. Human creates the PR.
• Never modify .rubocop_todo.yml.
• Never use safety_assured unless the plan explicitly says to and explains why.
• Never skip a Business Rule — if it's in the plan, it must be in the code AND in a spec.
• Never assume a side effect — only implement what's in the Side Effects section.
• Stop at 3 spec failures on the same error — ask the human, don't loop.