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 |
| 2 | Multi-Tool Agent Implementation | → workflow/phase-2-implementation.md |
| 3 | Error Handling & Validation | → workflow/phase-3-error-handling.md |
| 4 | Testing Agent Workflows | → workflow/phase-4-testing.md |
| 5 | Production Agent Patterns | → 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
Related Skills
- •
structured-outputs-advisor- Choose the right mode - •
json-outputs-implementer- For data extraction use cases