Mono Exec

Use this skill to execute planned work in a pnpm workspace monorepo with package-aware guardrails. mono-exec does not replace /exec; it injects monorepo-aware pre/post steps around the standard /exec contract.

Augmentation Injection Pattern

mono-exec adds these stages around normal exec execution:

1. Pre-execution: run mono-detect, generate lane specs when the phase is eligible for parallel monorepo dispatch, run mono-guard pre-flight, and present lane specs for plan-mode approval.
2. Dispatch: run cross-cutting steps serially first in the main agent, then dispatch package-scoped worktree waves on separate GitHub branches only after lane specs are approved and guard validation passes.
3. Post-dispatch: perform consolidation/PR review, run mono-guard --post-integration, update lane-spec lifecycle, then continue to mono-ship when shipping is requested.

The base /exec skill remains the source of truth for task selection, task docs, validation, history updates, commit/push, deploy handling, and next-step routing.

Flags

• Default: execute the next incomplete step.
• --phase: execute all steps in the current phase, using cross-cutting serial work first and package-scoped waves where eligible.
• --pipeline: execute the monorepo run flow and continue into mono-ship after successful post-integration guard validation.

Process

1. Run mono-detect.
   • If the project is not a detected pnpm workspace monorepo, delegate directly to /exec.
   • If turbo.json is present, record that build/test/lint should defer to turbo run.
   • If Turborepo is absent, record that build/test/lint should fall back to pnpm --filter.
2. Read the current phase execution profile from tasks/todo.md and, when needed for phase context, tasks/roadmap.md.
3. Decide execution mode:
   • If the phase mode is serial, delegate directly to /exec.
   • If the phase mode is not monorepo-parallel eligible, delegate directly to /exec.
   • If the phase mode is agent-team or explicitly package-scoped parallel work, continue with lane-spec generation.
4. Generate .agents/lane-specs.json.
   • Include phase, source_roadmap_hash, lifecycle, cross_cutting_steps, and lanes.
   • Each lane must include id, step, packages, owns, must_not_edit, depends_on, mode, and branch.
   • Put root-only, shared-package, lockfile, and root-config work into cross_cutting_steps with serial mode.
   • Put package-contained work into lanes with package-owned owns paths.
   • Ensure every package lane's must_not_edit includes lockfiles, root config files, and other lanes' package paths.
   • Ensure every package lane's branch is a deterministic non-primary GitHub branch such as agent-team/phase-N-<lane-id>.
5. Generate tasks/lane-specs.md as the committed human-readable mirror of .agents/lane-specs.json.
6. Run mono-guard pre-flight.
   • Use packs/monorepo/scripts/lane-spec-validate.sh through mono-guard.
   • Stop on FAIL.
   • Present WARN findings for review before dispatch.
7. Enter plan mode with lane specs for approval before launching package-scoped lanes.
8. Dispatch work:
   • Execute cross-cutting steps serially in the main agent first.
   • Create worktree-isolated package lanes on their declared GitHub branches for parallel work after cross-cutting work is integrated.
   • Give every lane its branch, owns, must_not_edit, depends_on, package scope, validation commands, and deliverable.
   • Require every lane to commit to its branch, push it, open or update a draft PR, and return branch name, commit SHA, validation evidence, PR URL, and changed paths.
   • Do not dispatch a lane until its depends_on steps are satisfied.
   • If the repo has no GitHub remote, branch push is unavailable, or PR creation/review cannot happen, stop before dispatch.
9. Apply stop-all-lanes failure semantics:
   • If any lane fails, halt remaining lanes.
   • Preserve worktree state for inspection.
   • Update .agents/lane-specs.json lifecycle to failed.
   • Update tasks/lane-specs.md with the failed lane and reason.
   • Report the blocker and stop before shipping.
10. After all lanes complete:

• Run the consolidation/PR review step: inspect every lane PR, validate changed paths against owns and must_not_edit, classify findings as blocker or advisory, and approve only safe lanes.
• Stop before integration if any lane has blocker findings, missing PR evidence, or changed files outside its boundary.
• Integrate approved lane work in dependency order from the reviewed remote branches.
• Run mono-guard --post-integration.
• If post-integration guard fails, stop and report boundary violations.
• If it passes, set lane-spec lifecycle to integrated and update tasks/lane-specs.md.

11. If --pipeline was used, continue to mono-ship; otherwise report next work and recommended command.

Validation Command Preference

• With turbo.json: prefer turbo run <task> --filter=<package> for build, test, lint, and package validation.
• Without turbo.json: prefer pnpm --filter <package> run <task>.
• Use .agents/monorepo.json.dependency_graph to order package work when Turborepo is absent.

Output

• Detection: monorepo detected or delegated to /exec.
• Execution mode: serial delegation, guarded package lanes, or pipeline.
• Lane specs: .agents/lane-specs.json and tasks/lane-specs.md status.
• Guard result: pre-flight and post-integration verdicts.
• Dispatch result: cross-cutting steps, package lanes, branch/commit/PR evidence, failures, and preserved worktrees when applicable.
• Consolidation/PR review: reviewed PRs, blocker/advisory findings, approved branches, and integration order.
• Lifecycle: draft, approved, dispatched, integrated, or failed.
• Next work: concrete follow-up.
• Recommended next command: one command.

Constraints

• Do not run package manager install/add commands in package lanes.
• Do not modify lockfiles from parallel lanes.
• Do not dispatch package lanes unless mono-guard pre-flight passes and lane specs are approved.
• Do not dispatch package lanes unless every write lane has a non-primary GitHub branch and PR review can be performed.
• Do not continue after a lane failure; preserve worktree state and mark lifecycle failed.
• Do not bypass standard /exec task selection, validation, history, commit/push, deploy, or next-step routing responsibilities.
• Do not use GitHub Actions.

Next-Step Routing

• Non-monorepo or serial phase: /exec.
• Pre-flight guard failure: /mono-guard after fixing or regenerating lane specs.
• Successful guarded run without pipeline: /mono-ship.
• Failed lane dispatch: inspect preserved worktree state, then rerun /mono-exec after the blocker is fixed.
• Completed pipeline: follow the next command reported by mono-ship.

Default Shipping Contract

Follow the shared shipping contract convention in CLAUDE.md.