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skills/api/json-structured-outputs/strict-tool-implementer/SKILL.md

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+---
+name: strict-tool-implementer
+description: >-
+  Use PROACTIVELY when building multi-step agentic workflows with validated tool parameters.
+  Implements Anthropic's strict tool use mode for guaranteed schema compliance.
+  Covers tool schema design, multi-tool agent workflows, error handling, testing, and production patterns.
+  Not for data extraction or classification tasks (use json-outputs-implementer instead).
+---
+
+# Strict Tool Implementer
+
+## Overview
+
+This skill implements Anthropic's strict tool use mode for reliable agentic systems. With `strict: true`, tool input parameters are guaranteed to match your schema—no validation needed in your tool functions.
+
+**What This Skill Provides:**
+- Production-ready tool schema design
+- Multi-tool workflow patterns
+- Agentic system architecture
+- Validation and error handling
+- Complete agent implementation examples
+
+**Prerequisites:**
+- Decision made via `structured-outputs-advisor`
+- Model: Claude Sonnet 4.5 or Opus 4.1
+- Beta header: `structured-outputs-2025-11-13`
+
+## When to Use This Skill
+
+**Use for:**
+- Building multi-step agentic workflows
+- Validating function call parameters
+- Ensuring type-safe tool execution
+- Complex tools with nested properties
+- Critical operations requiring guaranteed types
+
+**NOT for:**
+- Extracting data from text/images → `json-outputs-implementer`
+- Formatting API responses → `json-outputs-implementer`
+- Classification tasks → `json-outputs-implementer`
+
+## Response Style
+
+- **Tool-focused**: Design tools with clear, validated schemas
+- **Agent-aware**: Consider multi-tool workflows and composition
+- **Type-safe**: Guarantee parameter types for downstream functions
+- **Production-ready**: Handle errors, retries, and monitoring
+- **Example-driven**: Provide complete agent implementations
+
+## Workflow
+
+| Phase | Description | Details |
+|-------|-------------|---------|
+| 1 | Tool Schema Design | → [workflow/phase-1-schema-design.md](workflow/phase-1-schema-design.md) |
+| 2 | Multi-Tool Agent Implementation | → [workflow/phase-2-implementation.md](workflow/phase-2-implementation.md) |
+| 3 | Error Handling & Validation | → [workflow/phase-3-error-handling.md](workflow/phase-3-error-handling.md) |
+| 4 | Testing Agent Workflows | → [workflow/phase-4-testing.md](workflow/phase-4-testing.md) |
+| 5 | Production Agent Patterns | → [workflow/phase-5-production.md](workflow/phase-5-production.md) |
+
+## Quick Reference
+
+### Schema Template
+
+```python
+{
+    "name": "tool_name",
+    "description": "Clear description",
+    "strict": True,
+    "input_schema": {
+        "type": "object",
+        "properties": {...},
+        "required": [...],
+        "additionalProperties": False
+    }
+}
+```
+
+### Supported Schema Features
+
+✅ Basic types, enums, format strings, nested objects/arrays, required fields
+
+❌ Recursive schemas, min/max constraints, string length, complex regex
+
+## Reference Materials
+
+- [Common Agentic Patterns](reference/common-patterns.md)
+- [Success Criteria](reference/success-criteria.md)
+
+## Related Skills
+
+- `structured-outputs-advisor` - Choose the right mode
+- `json-outputs-implementer` - For data extraction use cases