config-audit/commands/implement.md

name	description	allowed-tools	model
config-audit:implement	Phase 5 - Execute action plan with backups and verification	Read, Write, Edit, Bash, Agent, AskUserQuestion	opus

Config-Audit: Implementation (Phase 5)

Execute the action plan with full backup, verification, and rollback support.

Prerequisites

• Must have completed Phase 4 (plan)
• Action plan at ~/.claude/config-audit/sessions/{session-id}/action-plan.md

Arguments

• $ARGUMENTS may contain --raw to forward to the implementer-agent's instructions; in --raw mode the agent renders v5.0.0 verbatim severity prefiks instead of humanized userActionLanguage urgency phrasing.

Implementation

Step 1: Parse flags, load and verify

Check whether $ARGUMENTS contains --raw. Carry the answer yourself: the agent prompt in Step 4 is not a shell, so a variable assigned in a bash block cannot be referenced from it. Substitute {mode} literally with --raw or humanized.

Find the most recent session with a plan (use the Glob tool for ~/.claude/config-audit/sessions/*/state.yaml, then Read the newest match — Read does not expand *). If none: "No action plan found. Run /config-audit plan first."

Use the Read tool on the action plan and count actions. Tell the user:

## Implementing Action Plan

Found {N} actions to execute across {M} files.
A backup will be created before any changes are made.

Step 2: Get user approval

AskUserQuestion:
  question: "Ready to implement {N} actions? Backup created automatically — you can roll back with one command."
  options:
    - "Yes, proceed"
    - "Review plan first" (then show the plan file path)
    - "Cancel"

Step 3: Create backup

Create backup silently, and print the backup ID — Step 6 has to tell the user how to roll back, and a timestamp that only ever existed inside a command substitution cannot be quoted later. Shell state does not survive to the next block, so capture the printed value and substitute it literally from here on:

BACKUP_ID=$(date +%Y%m%d_%H%M%S)
mkdir -p ~/.claude/config-audit/backups/"$BACKUP_ID"/files/ 2>/dev/null
echo "$BACKUP_ID"

Use the printed ID wherever {backup-id} appears below. Never invent or re-derive it with a second date call — a run that straddles a second boundary would hand the user a rollback ID that does not exist.

Copy each file to be modified. Generate manifest.yaml with checksums.

The manifest is what /config-audit rollback reads, so it MUST carry both lists:

files:                      # pre-existing files this run will MODIFY
  - backup: files/root/CLAUDE.md
    original: /abs/path/CLAUDE.md
    sha256: <sha256 of the pre-change content>
created:                    # files this run will CREATE (no backup can exist)
  - /abs/path/.claude/rules/post-quality.md

Record every create-type action under created:. Rollback cannot restore a file that never existed, but it must be able to tell the user which files it is leaving behind — a half-restored target is only dangerous when it is silent.

Tell the user: "Backup created. Implementing actions..."

Step 4: Execute actions

Group actions by dependencies. For each group, spawn implementer agents (batch of 3):

Agent(subagent_type: "config-audit:implementer-agent")
  model: sonnet
  prompt: |
    Execute action: {action-id}
    File: {file-path}, Type: {create|modify|delete}
    Mode: {mode} ("humanized" = humanized progress prose; "--raw" = v5.0.0 verbatim)
    Details: {changes}
    Verify backup exists, make change, validate syntax.
    When logging progress, use the humanized title/userActionLanguage
    fields from the action plan (the planner already rendered them) —
    do not re-derive severity prose. Append result to:
    ~/.claude/config-audit/sessions/{session-id}/implementation-log.md
    Append with Bash `>>` (heredoc) — NEVER the Write tool on this log;
    parallel agents share it and a full-file Write clobbers their entries.

Show progress between groups using the humanized titles already present in the action plan:

Action 1/N: {humanized title} — done
Action 2/N: {humanized title} — done
...

Step 5: Verify results

Spawn verifier agent:

Agent(subagent_type: "config-audit:verifier-agent")
  model: sonnet (note: using sonnet, not haiku)
  prompt: |
    Verify all changes from implementation:
    1. Modified files exist and are syntactically valid
    2. New files created correctly
    3. No new conflicts introduced
    Return your findings as your final message. Do NOT write them to a file —
    this agent is read-only by design (tools: Read, Glob, Grep) and has no
    write tool; instructing it to write a report is a contract it cannot keep.

Append the verifier's returned findings to the log yourself, with Bash >> (heredoc) — never the Write tool, for the same reason as Step 4:

cat >> ~/.claude/config-audit/sessions/{session-id}/implementation-log.md <<'EOF'
## Verification
{verifier findings}
EOF

If verifier finds issues: one retry with implementer agent. If still failing: report and suggest rollback.

Step 6: Present results

### Implementation Complete

**{succeeded} succeeded** | {failed} failed | {skipped} skipped

{If failed > 0:}
{failed} action(s) couldn't be completed — see log for details.

**Backup location:** `~/.claude/config-audit/backups/{backup-id}/`
**Rollback:** `/config-audit rollback {backup-id}`
**Full log:** `~/.claude/config-audit/sessions/{session-id}/implementation-log.md`

On reporting a score. Only quote a grade change if the pre-change grade was actually captured before Step 4 ran. Once the files are edited, only the new grade is measurable — a delta computed after the fact has no source and must not be invented. To offer one, measure first in Step 1 and again here:

node ${CLAUDE_PLUGIN_ROOT}/scanners/posture.mjs "<target-path>" --output-file /tmp/config-audit-implement-posture.json 2>/dev/null; echo $?

Then Read /tmp/config-audit-implement-posture.json. Both the --output-file and the 2>/dev/null are required by the output rules — a bare scanner call would put diagnostic output in front of the user. If no pre-change grade was captured, report the new grade alone and say nothing about a delta.

Step 7: Update state

Update state.yaml with all four fields .claude/rules/state-management.md requires:

• current_phase: "implement"
• completed_phases: append implement to the existing array (read it first; never replace it)
• next_phase: null
• updated_at: current timestamp

A full-file Write that names only two of the four silently deletes the other two.

Rollback

If the user requests rollback at any point:

1. Read manifest.yaml from backup
2. Restore each file and verify checksums
3. Report — do not delete — the files this run created. Rollback restores from backup, and no backup can exist for a file that did not exist before. Those paths stay on disk; /config-audit rollback lists them under "Left in place" so the user can remove them deliberately. Promising deletion here would leave a half-restored config that reads as a clean rollback.
4. Update state to rolled_back

Error Handling

Error	What happens
Permission denied	Skip action, log it, continue with others
File not found	Skip action, log it, continue
Invalid syntax after edit	Rollback that single file, log, continue
Critical failure	Offer full rollback