Official2026-06-29

DeepSeek Tool Calls Docs Define Strict Beta Schema Rules

Checked on June 29, 2026: DeepSeek's official Tool Calls guide documents OpenAI-compatible function calling, a Beta-only `strict` mode for exact schema matching, concrete supported and unsupported JSON Schema rules, and a required `tool` role replay pattern after execution.

What we verified on June 29, 2026

  • DeepSeek's official Tool Calls guide now documents a full OpenAI-compatible function-calling contract for chat completions, including tools definitions and tool_calls output in assistant responses.
  • The same page adds a stricter beta path: you can set strict: true on a function schema for more precise argument matching, but the docs mark that mode as Beta and require the Beta base URL.
  • DeepSeek publishes a concrete schema support boundary for strict mode: supported types are string, number, integer, boolean, object, array, enum, and anyOf.
  • The same strict-mode note also lists unsupported schema features such as minLength, maxLength, pattern, format, minimum, maximum, multipleOf, patternProperties, and array bounds like minItems and maxItems.
  • The replay contract after execution is concrete: callers should append the assistant message that contains the tool call, then append a tool role message with the returned result before asking the model for the next turn.

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