Grace Execute Agent Skill

<skill>

<preflight>

Require one active bundle with approved, identity-matched spec.xml and plan.xml. Approved plans are immutable. Read context, projections, assertions, scopes, task dependencies, and verification before editing. Reject phase-incompatible plans before writes: MustPassCommand must be leaf project evidence, and neither target assertions nor post-write task verification may invoke --assertions current or nest GRACE lifecycle commands. Supersede and replan instead of editing an approved conflict in place.

</preflight>

<assertion_commands>

• Active-baseline preflight before observed writes: grace lint --path PROJECT --assertions current
• Selected baseline: grace lint --path PROJECT --change C-ID --assertions baseline (add --run-commands when the baseline declares MustPassCommand)
• Selected target without commands: grace lint --path PROJECT --change C-ID --assertions target
• Selected target with command evidence: grace lint --path PROJECT --change C-ID --assertions target --run-commands
• Final end-state validation: grace lint --path PROJECT --change C-ID --assertions final (add --run-commands when the target declares MustPassCommand)
• Parallel preflight: grace lint --path PROJECT --parallel-preflight

</assertion_commands>

<mode_selection>

Wait for explicit sequential or parallel-safe choice. Parallel-safe requires the explicit preflight to pass. Workers never mutate approved plans; durable .grace changes are applied centrally after observed work verifies.

</mode_selection>

<recovery_decision_table>

| state | required action |

| clean-to-start | Run selected baseline, then execute tasks. |

| partial-observed-writes | Inspect the declared observed scope and ask whether to resume or revert. |

| durable-state-changed | Hard stop; supersede and replan. Approved assertions are immutable. |

| target-already-satisfied | Run final end-state validation, opted-in command evidence when declared, durable reconciliation, and ask for explicit apply confirmation. |

| unsafe-unknown-drift | Hard stop and report unexplained files. |

</recovery_decision_table>

<execution_rules>

• Run the selected baseline before implementation, including explicit --run-commands when its assertions declare MustPassCommand.
• Execute one dependency-ready task or one verified parallel-safe batch at a time.
• Run each task's acceptance and verification immediately.
• Apply approved durable context, graph, and verification changes centrally.
• Reconcile durable state, run leaf plan gates, then run selected --assertions final as the outermost lifecycle gate, including --run-commands when MustPassCommand is declared. Final mode performs full project lint, evaluates the selected target, keeps unrelated approved baselines active, and does not re-evaluate the selected plan's superseded baseline.
• Ask for explicit apply confirmation after fresh end-state evidence passes.
• Only then set spec and plan to applied and archive the complete bundle.
• Never edit approved assertions/scopes/tasks in place, bypass stale evidence, or continue through unknown drift.

</execution_rules>

</skill>