ModelContentBlock

import type { ModelContentBlock } from "@elie-laloum/outpost";

Parameters and properties

The fields below cover all variants; the signature specifies their allowed combinations.

typeRequired
"text" | "tool-call" | "tool-result" | "reasoning"
Block discriminator: text.
textVariant-dependent
string | string | undefined
Plain text of the block; empty text blocks are not sent to Anthropic.
idVariant-dependent
string
Service-issued call identifier that the matching tool result must reference.
nameVariant-dependent
string
Name of the requested tool, as declared in the request tools.
inputVariant-dependent
unknown
Parsed tool arguments. When the service returns invalid JSON, the raw string is kept so the caller can report the error to the model.
callIdVariant-dependent
string
Identifier of the tool call this result answers.
contentVariant-dependent
string
Text returned to the model for this call.
isErrorVariant-dependent
boolean | undefined
Marks the result as a failed tool execution. Only Anthropic transmits it, as is_error; OpenAI protocols send the content alone.
providerVariant-dependent
string
Identity of the provider that produced the block; other providers never receive it.
modelVariant-dependent
string
Model that produced the block; it is replayed only to the same model.
dataVariant-dependent
unknown
Opaque service payload: an Anthropic thinking or redacted_thinking block with its signature, or an OpenAI Responses reasoning item. Replay it unchanged.

export type ModelContentBlock =
  | ModelTextBlock
  | ModelToolCallBlock
  | ModelToolResultBlock
  | ModelReasoningBlock;