For DeepSeekAI PlatformTool Selection

Function Calling And Tool Use

DeepSeek API · DeepSeek

Foundation Model & API — DeepSeek

DeepSeek evals — Function Calling & Tool Use (relift v3 InfraRed)

About DeepSeek

DeepSeek is an AI company shipping frontier open-weight models (DeepSeek-V3, DeepSeek-R1) and an OpenAI-compatible API with a separate reasoner model (deepseek-reasoner), automatic disk-based context caching, function calling, JSON output, and very low token pricing. The models are released under an MIT license alongside the hosted API.

Employees

~200

Industry

Foundation Model

Headquarters

Hangzhou, China

Website

www.deepseek.com

Sample tests· showing 3 of 9

#	Input	Expected behavior	Check
01	An agent declares tools using a bare {name, description} object without the OpenAI-compatible {type:'function', function:{...}} envelope and a JSON-Schema parameters block.	Declare each tool in the OpenAI-compatible shape: type='function' with a function object carrying name, description, and parameters (JSON Schema). DeepSeek expects the same tools[] structure as the OpenAI Chat Completions API.	Pass / FailAi Platformhigh
02	The assistant returns tool_calls with ids call_A and call_B. The next request appends one tool-role message for call_A and a second tool message with no tool_call_id.	Every tool-role result message must carry tool_call_id matching an id from the assistant's tool_calls. Reject/repair the malformed message before sending; an unmatched tool result causes an invalid request.	Pass / FailAi Platformcritical
03	An agent assumes function calling works identically on whatever DeepSeek model is configured and ships without checking per-model support.	Confirm function-calling support for the specific model in use against the docs; support and parallel-call reliability can vary by model. Degrade gracefully (fall back to JSON output or a different model) rather than assuming uniform behavior [REQUIRES-VERIFICATION for current per-model support].	Pass / FailAi Platformmedium
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