Skip to content

Add fine grained tool streaming for OpenRouter Anthropic #9629

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
mrubens merged 1 commit into from
Nov 26, 2025
Merged

Add fine grained tool streaming for OpenRouter Anthropic #9629

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
24 changes: 15 additions & 9 deletions src/api/providers/__tests__/openrouter.spec.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -194,6 +194,7 @@ describe("OpenRouterHandler", () => {
top_p: undefined,
transforms: ["middle-out"],
}),
{ headers: { "x-anthropic-beta": "fine-grained-tool-streaming-2025-05-14" } },
)
})

Expand All @@ -218,7 +219,9 @@ describe("OpenRouterHandler", () => {

await handler.createMessage("test", []).next()

expect(mockCreate).toHaveBeenCalledWith(expect.objectContaining({ transforms: ["middle-out"] }))
expect(mockCreate).toHaveBeenCalledWith(expect.objectContaining({ transforms: ["middle-out"] }), {
headers: { "x-anthropic-beta": "fine-grained-tool-streaming-2025-05-14" },
})
})

it("adds cache control for supported models", async () => {
Expand Down Expand Up @@ -260,6 +263,7 @@ describe("OpenRouterHandler", () => {
}),
]),
}),
{ headers: { "x-anthropic-beta": "fine-grained-tool-streaming-2025-05-14" } },
)
})

Expand Down Expand Up @@ -295,14 +299,16 @@ describe("OpenRouterHandler", () => {

expect(result).toBe("test completion")

expect(mockCreate).toHaveBeenCalledWith({
model: mockOptions.openRouterModelId,
max_tokens: 8192,
thinking: undefined,
temperature: 0,
messages: [{ role: "user", content: "test prompt" }],
stream: false,
})
expect(mockCreate).toHaveBeenCalledWith(
{
model: mockOptions.openRouterModelId,
max_tokens: 8192,
temperature: 0,
messages: [{ role: "user", content: "test prompt" }],
stream: false,
},
{ headers: { "x-anthropic-beta": "fine-grained-tool-streaming-2025-05-14" } },
)
})

it("handles API errors", async () => {
Expand Down
14 changes: 12 additions & 2 deletions src/api/providers/openrouter.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -213,9 +213,14 @@ export class OpenRouterHandler extends BaseProvider implements SingleCompletionH
...(metadata?.tool_choice && { tool_choice: metadata.tool_choice }),
}

// Add Anthropic beta header for fine-grained tool streaming when using Anthropic models
const requestOptions = modelId.startsWith("anthropic/")
? { headers: { "x-anthropic-beta": "fine-grained-tool-streaming-2025-05-14" } }
: undefined

let stream
try {
stream = await this.client.chat.completions.create(completionParams)
stream = await this.client.chat.completions.create(completionParams, requestOptions)
} catch (error) {
throw handleOpenAIError(error, this.providerName)
}
Expand Down Expand Up @@ -417,9 +422,14 @@ export class OpenRouterHandler extends BaseProvider implements SingleCompletionH
...(reasoning && { reasoning }),
}

// Add Anthropic beta header for fine-grained tool streaming when using Anthropic models
const requestOptions = modelId.startsWith("anthropic/")
? { headers: { "x-anthropic-beta": "fine-grained-tool-streaming-2025-05-14" } }
: undefined

let response
try {
response = await this.client.chat.completions.create(completionParams)
response = await this.client.chat.completions.create(completionParams, requestOptions)
} catch (error) {
throw handleOpenAIError(error, this.providerName)
}
Expand Down
Loading