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feat(ai): round-trip Anthropic redacted thinking blocks (#38614)

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Aiden Cline 2026-07-24 00:42:44 -05:00 • committed by GitHub
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2 changed files with 175 additions and 5 deletions
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53
packages/ai/src/protocols/anthropic-messages.ts
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@ -75,6 +75,15 @@ const AnthropicThinkingBlock = Schema.Struct({
cache_control: Schema.optional(AnthropicCacheControl),
})
// Safety-filtered thinking arrives as an opaque encrypted `data` payload with
// no visible text. It must round-trip verbatim so multi-turn thinking + tool
// use conversations keep their reasoning continuity.
const AnthropicRedactedThinkingBlock = Schema.Struct({
type: Schema.tag("redacted_thinking"),
data: Schema.String,
cache_control: Schema.optional(AnthropicCacheControl),
})
const AnthropicToolUseBlock = Schema.Struct({
type: Schema.tag("tool_use"),
id: Schema.String,
@ -136,6 +145,7 @@ type AnthropicUserBlock = Schema.Schema.Type<typeof AnthropicUserBlock>
const AnthropicAssistantBlock = Schema.Union([
AnthropicTextBlock,
AnthropicThinkingBlock,
AnthropicRedactedThinkingBlock,
AnthropicToolUseBlock,
AnthropicServerToolUseBlock,
AnthropicServerToolResultBlock,
@ -214,6 +224,9 @@ const AnthropicStreamBlock = Schema.Struct({
text: Schema.optional(Schema.String),
thinking: Schema.optional(Schema.String),
signature: Schema.optional(Schema.String),
// redacted_thinking blocks arrive whole in content_block_start with the
// encrypted payload in `data`; there is no streaming delta sequence.
data: Schema.optional(Schema.String),
input: Schema.optional(Schema.Unknown),
// *_tool_result blocks arrive whole as content_block_start (no streaming
// delta) with the structured payload in `content` and the originating
@ -287,6 +300,12 @@ const signatureFromMetadata = (metadata: ProviderMetadata | undefined): string |
return typeof anthropic.signature === "string" ? anthropic.signature : undefined
}
const redactedDataFromMetadata = (metadata: ProviderMetadata | undefined): string | undefined => {
const anthropic = metadata?.anthropic
if (!ProviderShared.isRecord(anthropic)) return undefined
return typeof anthropic.redactedData === "string" ? anthropic.redactedData : undefined
}
const lowerTool = (breakpoints: Cache.Breakpoints, tool: ToolDefinition, inputSchema: JsonSchema): AnthropicTool => ({
name: tool.name,
description: tool.description,
@ -472,11 +491,16 @@ const lowerMessages = Effect.fn("AnthropicMessages.lowerMessages")(function* (
continue
}
if (part.type === "reasoning") {
content.push({
type: "thinking",
thinking: part.text,
signature: part.encrypted ?? signatureFromMetadata(part.providerMetadata),
})
// Mirrors Vercel's @ai-sdk/anthropic: a signature marks visible
// thinking; only signature-less parts carrying redactedData
// round-trip as opaque redacted_thinking blocks.
const signature = part.encrypted ?? signatureFromMetadata(part.providerMetadata)
const redactedData = redactedDataFromMetadata(part.providerMetadata)
if (signature === undefined && redactedData !== undefined) {
content.push({ type: "redacted_thinking", data: redactedData })
continue
}
content.push({ type: "thinking", thinking: part.text, signature })
continue
}
if (part.type === "tool-call") {
@ -747,6 +771,25 @@ const onContentBlockStart = (state: ParserState, event: AnthropicEvent): StepRes
]
}
// Redacted thinking surfaces as an empty reasoning part carrying the opaque
// payload as `redactedData` metadata (same model as Vercel's
// @ai-sdk/anthropic). The existing content_block_stop closes the part.
if (block.type === "redacted_thinking" && block.data) {
const events: LLMEvent[] = []
return [
{
...state,
lifecycle: Lifecycle.reasoningStart(
state.lifecycle,
events,
`reasoning-${event.index ?? 0}`,
anthropicMetadata({ redactedData: block.data }),
),
},
events,
]
}
const result = serverToolResultEvent(block)
if (!result) return [state, NO_EVENTS]
const events: LLMEvent[] = []