API ReferenceMessages

Validate Messages Request

Validate a chat completion request without executing it. This endpoint performs a dry-run validation of the chat request, checking for: - Message structure and content validation - Tool definitions and tool_choice compatibility - Parameter ranges and combinations - Conversation flow and message ordering - Response format compatibility with other options Returns detailed validation results including errors. Use this endpoint to validate requests before sending them to the main chat endpoint. Notes: - No tokens are consumed during validation - All validation rules match the main /messages endpoint - Warnings indicate potential issues but don't prevent execution - Request summary provides insights into the parsed request structure

Request

This endpoint expects an object.
modelstringRequiredDefaults to default
Model identifier or alias.
messageslist of objectsRequired
Conversation messages for the request.
max_tokensintegerRequired>=1
Maximum number of tokens to generate in the response.
systemlist of objectsOptional

System prompt input. Accepts str, list[str], System, list[System], or null. It is normalized internally to list[System].

toolslist of objectsOptional
Optional tool definitions.
thinkingobjectOptional
Thinking configuration.
tool_choiceobjectOptional
Tool selection policy.
output_configobjectOptional
Optional output configuration options.
cache_controlobjectOptional

Optional request-level cache control.

streambooleanOptional
Whether to stream the response back to the client.
tool_contextlist of objectsOptional
Context to provide to the tools, such as documents, databases connection strings, or data relevant to tool usage.
mcp_serverslist of objectsOptional
List of MCP servers to use for tool retrieval. Each server can have its own configuration.
containerstringOptional
Container identifier for reuse across requests.
response_formatobjectOptional

Deprecated response format. Use output_config.format instead.

priorityintegerOptional
Priority of the request, used for prioritizing responses.
seedintegerOptional
Random seed for reproducibility.
min_pdoubleOptional
Minimum probability threshold for token selection. Tokens with probability below this value are filtered out.
top_pdoubleOptional0-1
Nucleus sampling parameter. Only tokens with cumulative probability up to this value are considered.
temperaturedoubleOptional0-1
Controls randomness in generation. Higher values make output more random, lower values more deterministic.
top_kintegerOptional>=0
Limits token selection to the top K most likely tokens at each step.
repetition_penaltydoubleOptional
Penalty applied to tokens that have already appeared in the sequence to reduce repetition.
presence_penaltydoubleOptional
Penalty applied based on whether a token has appeared in the text, encouraging topic diversity.
frequency_penaltydoubleOptional
Penalty applied based on how frequently a token appears in the text, reducing repetitive content.
stop_sequenceslist of stringsOptional
Custom stop sequences that stop generation when matched.
metadataobjectOptional

Request metadata (for example, user_id).

service_tierenumOptional

Service tier preference (for example, “auto” or “standard_only”).

inference_geostringOptional
Geographic region hint for inference processing.
correlation_idstringOptional
Correlation ID for tracking the request across systems.
maximum_loaded_skillsintegerOptional>=1
Optional cap for concurrently loaded skills in a conversation. When exceeded, the oldest loaded skill is evicted.
context_managementanyOptional

Response

This endpoint returns an object.
validboolean
Is the request valid
errorslist of strings
List of validation errors if any

Errors

400
Bad Request
401
Unauthorized
422
Unprocessable Entity