Agent Skills: Git Worktree Manager

Git Worktree Manager

Manage parallel development workflows using Git worktrees with deterministic naming, automatic port allocation, environment file synchronization, dependency installation, and cleanup automation. Optimized for multi-agent workflows where each agent or terminal session owns an isolated worktree with its own ports, environment, and running services.

Core Capabilities

• Worktree lifecycle — create worktrees from new or existing branches with deterministic naming, copy .env files, install dependencies by lockfile detection, list with clean/dirty + ahead/behind status, and safely remove with uncommitted-change detection.
• Port allocation — deterministic per-worktree assignment (base + index * stride), collision detection against running processes, persistent map in .worktree-ports.json, and Docker Compose override generation.
• Multi-agent isolation — one branch per worktree, one agent per worktree, no shared state, conflict-free parallel execution, task-ID mapping for traceability.
• Cleanup automation — stale detection by age, merged-branch detection for safe removal, dirty-state warnings, and bulk cleanup with safety confirmations.

When to Use

• You need 2+ concurrent branches open with running dev servers.
• You want isolated environments for feature work, hotfixes, and PR review.
• Multiple AI agents need separate workspaces that do not interfere.
• Your current branch is blocked but a hotfix is urgent.
• You want automated cleanup instead of manual rm -rf operations.

Clarify First

Before managing worktrees, confirm these inputs. If any is unknown or vague, ASK — do not assume:

• [ ] Operation — create, list, remove, or clean up worktrees (selects the worktree_manager.py action vs port_allocator.py vs worktree_validator.py)
• [ ] Branch & base — which branch(es) the worktree(s) track and from what base (drives worktree naming and isolation)
• [ ] Port/service needs — whether dev servers or Docker need allocated ports (drives the deterministic port block and the Docker Compose override generated)

Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.

Tools

| Tool | Purpose | Command | |------|---------|---------| | worktree_manager.py | List, create, remove, and clean up worktrees | python scripts/worktree_manager.py list | | port_allocator.py | Assign/check/release deterministic port blocks; sync registry | python scripts/port_allocator.py status | | worktree_validator.py | Validate worktree health (stale, missing branch, env parity, port conflicts, lockfile) | python scripts/worktree_validator.py --stale-days 14 |

References

Load the reference that matches the task — keep this file lean and pull detail on demand:

• references/setup-and-ports.md — quick-start git worktree commands, the deterministic port-allocation strategy and .worktree-ports.json format, collision-detection snippet, the full setup-worktree.sh script, and the Docker Compose per-worktree override. Read when creating a worktree or wiring up ports/services.
• references/cleanup-and-workflows.md — the cleanup-worktrees.sh safe-cleanup script, the multi-agent assignment pattern and rules, the scenario→action decision matrix, and the post-creation validation checklist. Read when automating cleanup or coordinating agents.
• references/operations-playbook.md — common pitfalls, best practices, the troubleshooting table, and the success-criteria bar. Read before shipping a workflow or when diagnosing problems.

Scope & Limitations

This skill covers:

• Git worktree lifecycle: creation, listing, status inspection, and removal
• Deterministic port allocation and collision avoidance for parallel dev servers
• Environment file synchronization and Docker Compose override patterns
• Multi-agent workspace isolation strategies and cleanup automation

This skill does NOT cover:

• Git branching strategies or merge conflict resolution (see pr-review-expert and release-manager)
• Secret rotation, vault integration, or credential management (see env-secrets-manager)
• CI/CD pipeline configuration or automated test orchestration (see ci-cd-pipeline-builder)
• Monorepo package management, workspace linking, or cross-package dependency resolution (see monorepo-navigator)

Integration Points

| Skill | Integration | Data Flow | |-------|-------------|-----------| | env-secrets-manager | Worktree setup copies .env files that contain secrets managed by this skill | .env files flow from main repo to each worktree; secret references remain consistent across all copies | | ci-cd-pipeline-builder | CI pipelines can spin up worktrees for parallel test matrix execution | Pipeline config triggers setup-worktree.sh per matrix job; port allocation prevents service collisions | | release-manager | Release branches get dedicated worktrees for stabilization while feature work continues | Release worktree is created from the release branch; merged status drives cleanup automation | | monorepo-navigator | In monorepo setups, worktrees must respect package boundaries and shared dependencies | Worktree creation inherits the monorepo root lockfile; package-level dev servers use allocated port blocks | | pr-review-expert | PR reviews can be performed in isolated worktrees with running code for manual validation | Reviewer creates a worktree at the PR branch, runs the dev server on allocated ports, and removes after review | | tech-debt-tracker | Stale worktrees and abandoned branches surface as tech debt indicators | Cleanup script output feeds into debt tracking; worktree age and merge status inform priority scores |