Turn a one-line objective into a step-by-step construction plan for multi-session, multi-agent engineering projects. Each step has a self-contained context brief so a fresh agent can execute it cold. Includes adversarial review gate, dependency graph, parallel step detection, anti-pattern catalog, a

Blueprint — Construction Plan Generator Turn a one line objective into a step by step construction plan that any coding agent can execute cold. When to Use Breaking a large feature into multiple PRs with clear dependency order Planning a refactor or migration that spans multiple sessions Coordinating parallel workstreams across sub agents Any task where context loss between sessions would cause rework Do not use for tasks completable in a single PR, fewer than 3 tool calls, or when the user says "just do it." How It Works Blueprint runs a 5 phase pipeline: 1. Research — Pre flight checks (git, gh auth, remote, default branch), then reads project structure, existing plans, and memory files to gather context. 2. Design — Breaks the objective into one PR sized steps (3–12 typical). Assigns dependency edges, parallel/serial ordering, model tier (strongest vs default), and rollback strategy per step. 3. Draft — Writes a self contained Markdown plan file to plans/ . Every step includes a context brief, task list, verification commands, and exit criteria — so a fresh agent can execute any step without reading prior steps. 4. Review — Delegates adversarial review to a strongest model sub agent (e.g., Opus) against a checklist and anti pattern catalog. Fixes all critical findings before finalizing. 5. Register — Saves the plan, updates memory index, and presents the step count and parallelism summary to the user. Blueprint detects git/gh availability automatically. With git + GitHub CLI, it generates full branch/PR/CI workflow plans. Without them, it switches to direct mode (edit in place, no branches). Examples Basic usage Produces plans/myapp migrate database to postgresql.md with steps like: Step 1: Add PostgreSQL driver and connection config Step 2: Create migration scripts for each table Step 3: Update repository layer to use new driver Step 4: Add integration tests against PostgreSQL Step 5: Remove old database code and config Multi agent project Produces a plan with parallel steps where possible (e.g., "implement Anthropic plugin" and "implement OpenAI plugin" run in parallel after the plugin interface step is done), model tier assignments (strongest for the interface design step, default for implementation), and invariants verified after every step (e.g., "all existing tests pass", "no provider imports in core"). Key Features Cold start execution — Every step includes a self contained context brief. No prior context needed. Adversarial review gate — Every plan is reviewed by a strongest model sub agent against a checklist covering completeness, dependency correctness, and anti pattern detection. Branch/PR/CI workflow — Built into every step. Degrades gracefully to direct mode when git/gh is absent. Parallel step detection — Dependency graph identifies steps with no shared files or output dependencies. Plan mutation protocol — Steps can be split, inserted, skipped, reordered, or abandoned with formal protocols and audit trail. Zero runtime risk — Pure Markdown skill. The entire repository contains only .md files — no hooks, no shell scripts, no executable code, no package.json , no build step. Nothing runs on install or invocation beyond Claude Code's native Markdown skill loader. Installation This skill ships with Everything Claude Code. No separate installation is needed when ECC is installed. Full ECC install If you are working from the ECC repository checkout, verify the skill is present with: To update later, review the ECC diff before updating: Vendored standalone install If you are vendoring only this skill outside the full ECC install, copy the reviewed file from the ECC repository into ~/.claude/skills/blueprint/SKILL.md . Vendored copies do not have a git remote, so update them by re copying the file from a reviewed ECC commit rather than running git pull . Requirements Claude Code (for /blueprint slash command) Git + GitHub CLI (optional — enables full branch/PR/CI workflow; Blueprint detects absence and auto switches to direct mode) Source Inspired by antbotlab/blueprint — upstream project and reference design.