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73 lines
2.5 KiB
Markdown
73 lines
2.5 KiB
Markdown
---
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name: parallel-execution-optimizer
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description: Use when the user wants a task done much faster through parallel work, concurrent agents, batched tool calls, isolated worktrees, or many independent verification lanes without losing correctness.
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origin: ECC
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tools: Read, Write, Edit, Bash, Grep, Glob
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---
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# Parallel Execution Optimizer
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Use this skill when speed comes from doing independent work at the same time:
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repo inspection, file reads, API checks, browser checks, build/test lanes,
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deploy readbacks, or multi-worktree implementation passes.
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## Core Pattern
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Turn urgency into a dependency graph before acting.
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1. Define the objective and done signal.
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2. Split work into lanes.
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3. Mark each lane as parallel, sequential, or gated.
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4. Run independent reads/checks together.
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5. Keep writes isolated by file, worktree, branch, service, or dataset.
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6. Merge only after evidence shows the lanes are compatible.
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7. End with a verification table, not a vague speed claim.
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## Lane Matrix
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Before a large push, write a compact matrix:
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```text
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Lane | Can run in parallel? | Write surface | Risk | Verification
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Repo scan | yes | none | low | rg/git status outputs
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Backend patch | maybe | src/api | medium | unit tests
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Frontend patch | maybe | app/components | medium | browser screenshot
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Deploy readback | after build | remote service | high | live URL + logs
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```
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Only run lanes in parallel when their write surfaces do not collide.
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## Execution Rules
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- Batch file reads, searches, status checks, and metadata queries.
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- Use isolated worktrees for large unrelated implementation lanes.
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- Start long-running tests, builds, backfills, and deploys in separate sessions,
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then poll them deliberately.
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- If a lane discovers a blocker that changes the plan, pause dependent lanes
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and update the matrix.
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- Never let a background process outlive the turn unless the user explicitly
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asked for a continuing service.
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- Do not parallelize destructive commands, migrations, writes to the same table,
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or live customer-impacting deploys without an explicit gate.
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## Output Shape
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Use this when reporting:
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```text
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Parallel execution result:
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- Lanes run: 5
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- Lanes completed: 4
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- Blocked lane: deploy readback, waiting on DNS propagation
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- Fast path found: batched repo scan + focused tests
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- Verification: lint pass, unit pass, live smoke pass
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```
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## Failure Modes
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- More concurrency that creates conflicting edits.
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- Benchmarking the tool instead of the task.
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- Treating "fast" as done before correctness is proven.
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- Forgetting to poll running sessions.
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- Hiding skipped checks behind a success summary.
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