implement

Implement Command

Creates minimal implementation following existing patterns.

Usage

/sf:implement [--isolate] [SPECIFICATION_OR_PATH]

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Project Context

• Branch: !git branch --show-current 2>/dev/null
• Spec exists: !test -f .claude/.sf/spec.md && echo "yes" || echo "no"

Input Resolution

Input Resolution:

1. Parse $ARGUMENTS: If --isolate is present, set ISOLATE=true and strip it from remaining args
2. If remaining args provided: Use as specification path or inline requirements
3. Else if .claude/.sf/spec.md exists: Use it
4. Else: Use AskUserQuestion tool to ask for specification location

Execution

After input resolution, run sequential agents:

Step 1: Learn

• Use Agent tool with subagent_type="Explore", maxTurns=10 to find similar patterns in the codebase for: $SPECIFICATION (request "medium" thoroughness in the prompt)
• Save findings to .claude/.sf/research/pattern-example.md

Step 2: Implement

• If ISOLATE is true: Task: implement-minimal (maxTurns: 25) with spec: $SPECIFICATION, isolation: "worktree"
• Else: Task: implement-minimal (maxTurns: 25) with spec: $SPECIFICATION

Output: Implementation + .claude/.sf/implementation-summary.md

Philosophy

This command enforces:

• Pattern consistency over creativity
• Working code over perfect code
• Minimal solution over extensible solution

Error Recovery

If exploration finds no patterns:

1. implement-minimal creates basic file structure following language conventions
2. Implements only the core requirement (no extras)
3. Uses standard naming patterns for the technology
4. Notes in summary: "No existing patterns found - used minimal approach"