How do I handle multiple tool calls simultaneously?

This skill provides patterns for parallel tool calling using asynchronous execution loops, allowing the LLM to trigger several operations concurrently to reduce latency.

What is the 2026 strict mode for function calling?

Strict mode is a best practice that enforces rigorous JSON schema validation, requiring all properties to be listed as required and disabling additional properties to ensure 100% reliability in LLM responses.

How many tools should I provide to an LLM at once?

For optimal performance and to avoid model confusion, it is recommended to provide between 5 and 15 tools per interaction, depending on the complexity of the task.

Can I use Pydantic with this skill?

Yes, the skill includes specific implementation patterns for using Pydantic models to define tool parameters and automatically parse structured LLM responses into typed Python objects.

LLM Function Calling & Tool Use

Name: LLM Function Calling & Tool Use
Author: yonatangross

byyonatangross

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Data Science & ML

Implements production-ready tool-use patterns and structured output schemas for LLMs using the latest industry standards.

This skill provides a comprehensive framework for enabling Large Language Models to interact with external tools and return guaranteed structured data. It focuses on the latest standards, including strict schema validation, robust tool execution loops, and Pydantic-based structured outputs. Whether you are building autonomous agents or complex API integrations, this skill ensures your LLM interactions are reliable, type-safe, and follow modern best practices like parallel tool call management and strict JSON enforcement.

Key Features

01Asynchronous tool execution loops with multi-step reasoning

02Type-safe structured output generation using Pydantic

03Strict-mode tool definitions for guaranteed schema compliance

04Parallel tool call implementation and optimization

05LangChain tool binding and model integration patterns

0629 GitHub stars

Use Cases

01Building autonomous AI agents that perform database searches and calculations

02Integrating LLMs with external APIs via robust, validated tool-calling interfaces

03Extracting structured data from unstructured text with 100% JSON reliability

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add yonatangross/skillforge-claude-plugin function-calling

For use in Claude.ai and ChatGPT

Download Skill