planner-extract-domain

name	planner-extract-domain
categories	["planner"]
description	Extract domain knowledge and naming conventions for planning context
hooks	{"PreToolUse":[{"matcher":"*","hooks":[{"type":"command","command":"echo '[SKILL: planner-extract-domain] Extracting domain knowledge...'","once":true}]}]}

planner-extract-domain

Extract domain knowledge, naming conventions, and structural patterns specific to the project. Optional step — failure is non-fatal and the planner recipe continues without domain context.

When to Use

• Invoked by the planner recipe after planner-analyze completes
• Provides richer domain context for decomposition planning

Arguments

• $1 — Absolute path to analysis.json produced by planner-analyze
• $2 — Absolute path to a file containing the task description. When provided and non-empty, focus domain extraction on areas relevant to the stated task. When empty, perform a full-codebase survey.

Critical Constraints

NEVER:

• Modify any target project files
• Abort the calling recipe on failure — log a warning and return gracefully
• Run subagents in the background (run_in_background: true is prohibited)
• If $1 is empty or the file does not exist, STOP immediately and report failure

ALWAYS:

• Read the analysis file from argument $1 before spawning subagents
• Use Explore subagents for all file reads
• Spawn subagents in parallel

Workflow

Step 1: Read analysis

Read the analysis.json file from argument $1. Use its language, framework, architecture_style, and key_patterns fields to focus subagent queries.

Step 2: Launch 3–5 parallel Explore subagents

Read the task description: if $2 is provided and non-empty, read the file at that path.

If the task description is available, include it in each subagent's prompt: "Focus exploration on domain vocabulary, abstractions, and integration points relevant to this task: {task}. Prioritize areas the task will touch over exhaustive full-codebase coverage."

Spawn all concurrently with model: "sonnet". Always spawn agents 1–3; spawn agents 4–5 only when the project has >20 modules or architecture_style is layered/hexagonal:

1. Domain Vocabulary — Extract domain-specific terms, entity names, and verb patterns used in identifiers. Look for: class names, function names, docstrings, README files, ADR documents.

2. Existing Abstractions — Identify base classes, protocols, ABCs, and reusable interfaces. Look for: class * (Protocol), ABC, the abstractmethod decorator, shared base types.

3. Integration Points — Identify external system boundaries, HTTP clients, database adapters, message queues. Look for: import of third-party HTTP/DB libraries, adapter classes, port/adapter naming.

4. Cross-cutting Concerns (deep mode) — Identify async patterns, error handling conventions, logging strategy. Look for: async def, custom exception hierarchies, structured logging calls.

5. Data Flow Patterns (deep mode) — Identify pipeline stages, transformation chains, data schemas. Look for: dataclass chains, TypedDict, Pydantic models, transformation functions.

Step 3: Synthesize

Merge all agent outputs into a coherent domain_knowledge.md Markdown document with sections: Domain Vocabulary, Key Abstractions, Integration Points, Cross-cutting Concerns, Data Flow Patterns.

Step 4: Write output (non-fatal)

Write to $(dirname $1)/domain_knowledge.md. If any step fails, log a warning to stdout and exit with code 0 — do not propagate the error to the recipe.