speckit.implement

Sub-Agent Delegation

When executing this command, delegate independent work to parallel sub-agents to reduce total execution time.

How to dispatch sub-agents in Copilot:

• VS Code: Use the runSubagent tool to spawn each sub-agent in an isolated context.
• CLI: Delegate to a sub-agent process — Copilot CLI automatically manages subsidiary sub-agent execution. You can also target custom agents defined in .github/agents/ or ~/.copilot/agents/.

Parallel Task Execution

When processing tasks within a phase, identify all tasks marked with [P] (parallel-safe). Dispatch each parallel-safe task as a separate sub-agent:

• For each [P] task in the current phase: → Sub-agent: "Implement task {TaskID}: {description}. Context: {relevant plan/spec excerpts}. File path: {target file}. Return: confirmation of completion, files created/modified, and any issues encountered."

Rules for sub-agent dispatch:

• Only dispatch tasks within the same phase — never cross phase boundaries
• Sequential tasks (without [P]) must run in the main agent, in order
• If a parallel task depends on a sequential task in the same phase, wait for the sequential task first
• After all sub-agents for a phase complete, verify results in the main agent before moving to the next phase
• Mark each completed task as [X] in tasks.md after verifying the sub-agent's output

Context Loading in Parallel

When loading implementation context (step 3), dispatch parallel reads:

1. Sub-agent: Load plan context — "Read plan.md and extract tech stack, architecture decisions, and file structure. Return a structured summary."
2. Sub-agent: Load supporting docs — "Read data-model.md, contracts/, research.md, and quickstart.md (whichever exist). Return a consolidated context summary."

Use the consolidated results to inform implementation.