## [ERR-20260330-001] pure_response_rule_violation

**Logged**: 2026-03-30T08:19:00Z
**Priority**: high
**Status**: resolved
**Area**: orchestration

### Summary
Mixed natural language with tool calls in a single response, violating the Pure Response Rule.

### Error
Response contained introductory text followed by a JSON array of tool calls. The system expects either pure tool calls (JSON only) or pure text (no tool calls), never both.

### Context
- Attempted to spawn a ClawTeam sub-agent for portfolio project
- Added explanatory text before the tool call JSON
- This causes response rejection

### Suggested Fix
- Always separate tool calls and natural language into distinct turns
- Use `sessions_yield` after spawning to wait for results
- Send user updates via `message` tool as separate tool calls if needed

### Metadata
- Reproducible: yes
- Related Files: RULES.md (Tool Call Rules section)
- See Also: LRN-20260330-001 (mandatory skill usage rules)