Skill

openrouter-function-calling

Implement function/tool calling with OpenRouter models. Use when building agents or structured outputs. Trigger with phrases like 'openrouter functions', 'openrouter tools', 'openrouter agent', 'function calling'.

From openrouter-pack

Install

Run in your terminal

npx claudepluginhub nickloveinvesting/nick-love-plugins --plugin openrouter-pack

Tool Access

This skill is limited to using the following tools:

ReadWriteEditGrep

Supporting Assets

View in Repository

references/advanced-tool-definitions.md

references/basic-function-calling.md

references/errors.md

references/examples.md

references/forced-tool-use.md

references/model-compatibility.md

references/parallel-tool-calls.md

references/streaming-with-tools.md

references/tool-router.md

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Last CommitMar 20, 2026

Actions

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Instructions

Define tool schemas: Create a tools array with JSON Schema definitions for each function, specifying name, description, and parameter types

Send a request with tools: Include the tools array in your chat completion request; set tool_choice: "auto" to let the model decide when to call functions

Parse tool calls: Extract tool_calls from response.choices[0].message, deserialize each function.arguments JSON string

Execute and return results: Run each function locally, then send a follow-up request with role: "tool" messages containing the results

Handle multi-turn loops: Continue the request-execute-respond cycle until the model returns a final text response without tool calls

Error Handling

Error

Cause

Fix

tool_calls is null

Model chose not to call tools or doesn't support them

Check model compatibility; use tool_choice: "required" to force

JSON parse error on arguments

Model generated malformed JSON

Wrap JSON.parse in try/catch; retry with a more capable model

400 invalid tool schema

Schema has unsupported types or format

Use only JSON Schema draft-07 types; avoid $ref or complex constructs

See ${CLAUDE_SKILL_DIR}/references/errors.md for full error reference.

Openrouter Function Calling

Overview

This skill demonstrates implementing function calling and tool use patterns with OpenRouter-supported models.

Prerequisites

OpenRouter integration
Model that supports function calling (GPT-4, Claude, etc.)

Instructions

Define tool schemas: Create a tools array with JSON Schema definitions for each function, specifying name, description, and parameter types
Send a request with tools: Include the tools array in your chat completion request; set tool_choice: "auto" to let the model decide when to call functions
Parse tool calls: Extract tool_calls from response.choices[0].message, deserialize each function.arguments JSON string
Execute and return results: Run each function locally, then send a follow-up request with role: "tool" messages containing the results
Handle multi-turn loops: Continue the request-execute-respond cycle until the model returns a final text response without tool calls

Output

Model-generated function calls with properly typed arguments
Multi-turn conversation with tool execution results fed back to the model
Final synthesized response incorporating tool outputs

Error Handling

Error	Cause	Fix
`tool_calls` is null	Model chose not to call tools or doesn't support them	Check model compatibility; use `tool_choice: "required"` to force
JSON parse error on arguments	Model generated malformed JSON	Wrap `JSON.parse` in try/catch; retry with a more capable model
400 invalid tool schema	Schema has unsupported types or format	Use only JSON Schema draft-07 types; avoid `$ref` or complex constructs

See ${CLAUDE_SKILL_DIR}/references/errors.md for full error reference.

Examples

See ${CLAUDE_SKILL_DIR}/references/examples.md for runnable code samples.

openrouter-function-calling

openrouter-function-calling

Openrouter Function Calling

Overview

Prerequisites

Instructions

Output

Error Handling

Examples

Resources

Openrouter Function Calling

Overview

Prerequisites

Instructions

Output

Error Handling

Examples

Resources