Plan Attest

Run the plan attestation helper for the active plan.

Steps:

1. Resolve the active plan: prefer ${PLAN_ID} env var, then .planning/.active_plan, then newest .planning/<dir>/, then legacy ./task_plan.md.
2. Compute the SHA-256 of the resolved task_plan.md.
3. Write the hex digest to .planning/<active-plan>/.attestation (parallel-plan mode) or ./.plan-attestation (legacy mode).
4. Confirm to the user with the short hash (first 12 hex chars) and the storage path.

Implementation:

• On Linux/macOS/Git Bash: sh ${CLAUDE_PLUGIN_ROOT}/scripts/attest-plan.sh
• On Windows PowerShell: & "$env:USERPROFILE\.claude\skills\planning-with-files\scripts\attest-plan.ps1"

Flags:

• --show — print the currently stored hash and where it lives.
• --clear — remove the attestation (re-open the plan to free editing).

After running this command, every UserPromptSubmit and PreToolUse hook fire compares task_plan.md against the stored hash. If they diverge, the hook emits [PLAN TAMPERED — injection blocked] instead of feeding plan content into the model. Re-run /plan-attest whenever you intentionally edit and re-approve the plan.