Subject: Tool calling that just works
From: OpenRouter Team <[email-masked]>
To: [email-masked]
Date: Fri, 27 Mar 2026 21:25:37 +0000

OpenRouter

OpenRouter ( https://openrouter.ai/?utm_campaign=Welcome+Email+Campaign+%232&utm_content=ToolCalling-email&utm_medium=email_action&utm_source=customer.io )

Hi T,

Tool calls ( https://openrouter.ai/docs/guides/features/tool-calling?utm_campaign=Welcome+Email+Campaign+%232&utm_content=ToolCalling-email&utm_medium=email_action&utm_source=customer.io ) give an LLM the ability to interact with the outside world, as well as power agentic workflows.

OpenRouter standardizes the tool calling interface across models and providers, making it easy to integrate external tools with any supported model.

You can find models that support tool calling by filtering on the models page ( openrouter.ai/models?supported_parameters=tools&utm_campaign=Welcome+Email+Campaign+%232&utm_content=ToolCalling-email&utm_medium=email_action&utm_source=customer.io ). 

Learn more about tool calling, including examples such as “multi-level research with reasoning ( https://openrouter.ai/docs/guides/features/tool-calling?utm_campaign=Welcome+Email+Campaign+%232&utm_content=ToolCalling-email&utm_medium=email_action&utm_source=customer.io#example-multi-step-research-with-reasoning )”, and its corresponding code snippets in the documentation ( https://openrouter.ai/docs/guides/features/tool-calling?utm_campaign=Welcome+Email+Campaign+%232&utm_content=ToolCalling-email&utm_medium=email_action&utm_source=customer.io ).

Happy tool calling!

Best,
OpenRouter Team
For questions or comments, reach out to us on X ( https://x.com/openrouterai?utm_campaign=Welcome+Email+Campaign+%232&utm_content=ToolCalling-email&utm_medium=email_action&utm_source=customer.io ) or on Discord ( https://discord.com/invite/8TpuzNXQYr?utm_campaign=Welcome+Email+Campaign+%232&utm_content=ToolCalling-email&utm_medium=email_action&utm_source=customer.io ).

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