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mrubens merged 2 commits into from
Nov 26, 2025
Merged

feat(mistral): add native tool calling support #9625

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3b2a87d
feat(mistral): add native tool calling support
hannesrudolph Nov 26, 2025
ab12b2f
refactor(mistral): remove unused convertToolChoiceForMistral method
hannesrudolph Nov 26, 2025
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27 changes: 18 additions & 9 deletions packages/types/src/providers/mistral.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,73 +11,82 @@ export const mistralModels = {
contextWindow: 128_000,
supportsImages: true,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 2.0,
outputPrice: 5.0,
},
"devstral-medium-latest": {
maxTokens: 131_000,
maxTokens: 8192,
contextWindow: 131_000,
supportsImages: true,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 0.4,
outputPrice: 2.0,
},
"mistral-medium-latest": {
maxTokens: 131_000,
maxTokens: 8192,
contextWindow: 131_000,
supportsImages: true,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 0.4,
outputPrice: 2.0,
},
"codestral-latest": {
maxTokens: 256_000,
maxTokens: 8192,
contextWindow: 256_000,
supportsImages: false,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 0.3,
outputPrice: 0.9,
},
"mistral-large-latest": {
maxTokens: 131_000,
maxTokens: 8192,
contextWindow: 131_000,
supportsImages: false,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 2.0,
outputPrice: 6.0,
},
"ministral-8b-latest": {
maxTokens: 131_000,
maxTokens: 8192,
contextWindow: 131_000,
supportsImages: false,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 0.1,
outputPrice: 0.1,
},
"ministral-3b-latest": {
maxTokens: 131_000,
maxTokens: 8192,
contextWindow: 131_000,
supportsImages: false,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 0.04,
outputPrice: 0.04,
},
"mistral-small-latest": {
maxTokens: 32_000,
maxTokens: 8192,
contextWindow: 32_000,
supportsImages: false,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 0.2,
outputPrice: 0.6,
},
"pixtral-large-latest": {
maxTokens: 131_000,
maxTokens: 8192,
contextWindow: 131_000,
supportsImages: true,
supportsPromptCache: false,
supportsNativeTools: true,
inputPrice: 2.0,
outputPrice: 6.0,
},
} as const satisfies Record<string, ModelInfo>

export const MISTRAL_DEFAULT_TEMPERATURE = 0
export const MISTRAL_DEFAULT_TEMPERATURE = 1
221 changes: 220 additions & 1 deletion src/api/providers/__tests__/mistral.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -39,9 +39,11 @@ vi.mock("@mistralai/mistralai", () => {
})

import type { Anthropic } from "@anthropic-ai/sdk"
import type OpenAI from "openai"
import { MistralHandler } from "../mistral"
import type { ApiHandlerOptions } from "../../../shared/api"
import type { ApiStreamTextChunk, ApiStreamReasoningChunk } from "../../transform/stream"
import type { ApiHandlerCreateMessageMetadata } from "../../index"
import type { ApiStreamTextChunk, ApiStreamReasoningChunk, ApiStreamToolCallPartialChunk } from "../../transform/stream"

describe("MistralHandler", () => {
let handler: MistralHandler
Expand Down Expand Up @@ -223,6 +225,223 @@ describe("MistralHandler", () => {
})
})

describe("native tool calling", () => {
const systemPrompt = "You are a helpful assistant."
const messages: Anthropic.Messages.MessageParam[] = [
{
role: "user",
content: [{ type: "text", text: "What's the weather?" }],
},
]

const mockTools: OpenAI.Chat.ChatCompletionTool[] = [
{
type: "function",
function: {
name: "get_weather",
description: "Get the current weather",
parameters: {
type: "object",
properties: {
location: { type: "string" },
},
required: ["location"],
},
},
},
]

it("should include tools in request when toolProtocol is native", async () => {
const metadata: ApiHandlerCreateMessageMetadata = {
taskId: "test-task",
tools: mockTools,
toolProtocol: "native",
}

const iterator = handler.createMessage(systemPrompt, messages, metadata)
await iterator.next()

expect(mockCreate).toHaveBeenCalledWith(
expect.objectContaining({
tools: expect.arrayContaining([
expect.objectContaining({
type: "function",
function: expect.objectContaining({
name: "get_weather",
description: "Get the current weather",
parameters: expect.any(Object),
}),
}),
]),
toolChoice: "any",
}),
)
})

it("should not include tools when toolProtocol is xml", async () => {
const metadata: ApiHandlerCreateMessageMetadata = {
taskId: "test-task",
tools: mockTools,
toolProtocol: "xml",
}

const iterator = handler.createMessage(systemPrompt, messages, metadata)
await iterator.next()

expect(mockCreate).toHaveBeenCalledWith(
expect.not.objectContaining({
tools: expect.anything(),
}),
)
})

it("should handle tool calls in streaming response", async () => {
// Mock stream with tool calls
mockCreate.mockImplementationOnce(async (_options) => {
const stream = {
[Symbol.asyncIterator]: async function* () {
yield {
data: {
choices: [
{
delta: {
toolCalls: [
{
id: "call_123",
type: "function",
function: {
name: "get_weather",
arguments: '{"location":"New York"}',
},
},
],
},
index: 0,
},
],
},
}
},
}
return stream
})

const metadata: ApiHandlerCreateMessageMetadata = {
taskId: "test-task",
tools: mockTools,
toolProtocol: "native",
}

const iterator = handler.createMessage(systemPrompt, messages, metadata)
const results: ApiStreamToolCallPartialChunk[] = []

for await (const chunk of iterator) {
if (chunk.type === "tool_call_partial") {
results.push(chunk)
}
}

expect(results).toHaveLength(1)
expect(results[0]).toEqual({
type: "tool_call_partial",
index: 0,
id: "call_123",
name: "get_weather",
arguments: '{"location":"New York"}',
})
})

it("should handle multiple tool calls in a single response", async () => {
// Mock stream with multiple tool calls
mockCreate.mockImplementationOnce(async (_options) => {
const stream = {
[Symbol.asyncIterator]: async function* () {
yield {
data: {
choices: [
{
delta: {
toolCalls: [
{
id: "call_1",
type: "function",
function: {
name: "get_weather",
arguments: '{"location":"NYC"}',
},
},
{
id: "call_2",
type: "function",
function: {
name: "get_weather",
arguments: '{"location":"LA"}',
},
},
],
},
index: 0,
},
],
},
}
},
}
return stream
})

const metadata: ApiHandlerCreateMessageMetadata = {
taskId: "test-task",
tools: mockTools,
toolProtocol: "native",
}

const iterator = handler.createMessage(systemPrompt, messages, metadata)
const results: ApiStreamToolCallPartialChunk[] = []

for await (const chunk of iterator) {
if (chunk.type === "tool_call_partial") {
results.push(chunk)
}
}

expect(results).toHaveLength(2)
expect(results[0]).toEqual({
type: "tool_call_partial",
index: 0,
id: "call_1",
name: "get_weather",
arguments: '{"location":"NYC"}',
})
expect(results[1]).toEqual({
type: "tool_call_partial",
index: 1,
id: "call_2",
name: "get_weather",
arguments: '{"location":"LA"}',
})
})

it("should always set toolChoice to 'any' when tools are provided", async () => {
// Even if tool_choice is provided in metadata, we override it to "any"
const metadata: ApiHandlerCreateMessageMetadata = {
taskId: "test-task",
tools: mockTools,
toolProtocol: "native",
tool_choice: "auto", // This should be ignored
}

const iterator = handler.createMessage(systemPrompt, messages, metadata)
await iterator.next()

expect(mockCreate).toHaveBeenCalledWith(
expect.objectContaining({
toolChoice: "any",
}),
)
})
})

describe("completePrompt", () => {
it("should complete prompt successfully", async () => {
const prompt = "Test prompt"
Expand Down
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