Individual skill

openrouter-function-calling

Implement function/tool calling with OpenRouter models. Use when building agents, structured output, or tool-augmented LLM workflows. Triggers: 'openrouter function calling', 'openrouter tools', 'openrouter agent tools', 'tool use openrouter'.

skills/.curated/openrouter-function-calling/SKILL.md

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Repository stars (not skill ratings): 2,916
Repository last updated: Nov 12, 2026
License: MIT

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ai Repository topic
automation Repository topic
claude-code Repository topic
devops Repository topic
mcp Repository topic
ai-agents Repository topic
anthropic Repository topic
claude-code-plugins Repository topic
developer-tools Repository topic
llm Repository topic
saas Declared skill tag
openrouter Declared skill tag
function-calling Declared skill tag
agents Declared skill tag
tools Declared skill tag
engineering Derived category

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references/advanced-tool-definitions.mddoc · 3,046 bytes
references/basic-function-calling.mddoc · 3,080 bytes
references/errors.mddoc · 478 bytes
references/examples.mddoc · 4,484 bytes
references/forced-tool-use.mddoc · 823 bytes
references/model-compatibility.mddoc · 981 bytes
references/parallel-tool-calls.mddoc · 1,135 bytes
references/streaming-with-tools.mddoc · 2,000 bytes
references/tool-router.mddoc · 1,459 bytes

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# OpenRouter Function Calling

## Overview

OpenRouter supports OpenAI-compatible tool/function calling across multiple providers. Define tools as JSON Schema, send them with your request, and the model returns structured `tool_calls` instead of free text. This works with GPT-4o, Claude 3.5, Gemini, and other tool-capable models via the same API. The key difference from direct provider APIs: OpenRouter normalizes the tool calling interface, so the same code works across providers.

## Prerequisites

- An OpenRouter API key (`sk-or-v1-...`) exported as `OPENROUTER_API_KEY` — see the `openrouter-install-auth` skill for setup
- Python 3.8+ or Node.js 18+ with the OpenAI SDK (`pip install openai` / `npm install openai`)
- A tool-capable model — check the Model Compatibility table below or query `/api/v1/models` (e.g., `openai/gpt-4o`, `anthropic/claude-3.5-sonnet`)
- Real function implementations to dispatch tool calls to (the `execute_tool()` dispatcher below stubs `get_weather` and `search_database`)

## Instructions