Q82: one output cap and a whole-response wait across provider paths

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/services/provider-adapters.ts

@@ -22,7 +22,9 @@ import {
 } from "./provider-auth-profiles";
 import { backgroundUnsupported, retrieveUnsupported } from "./provider-background";
 import { authorizeWithParser, refreshUnsupported, revokeLocalProfile } from "./provider-auth-lifecycle";
-import { getJson, postEventStream, postJson, type JsonRecord } from "./provider-http";
+import { getJson, postEventStream, postJson, WHOLE_RESPONSE_WAIT, type JsonRecord } from "./provider-http";
+import { OUTPUT_RESERVE_TOKENS } from "./context-budget";
+import { chatMaxTokensField } from "./provider-tool-turns/chat-format";
 import { fetchAnthropicModels, fetchOpenAiModels } from "./provider-models-fetch";
 import { KIMI_CODE_BASE_URL } from "./oauth/kimi-code-flow";
 import { FINISHED_STOP_REASONS, incompleteTurn, requireFinished } from "./provider-tool-turn";
@@ -70,6 +72,7 @@ export const providerAdapters: ProviderAdapterRegistry = {
         model: input.model,
         input: input.prompt,
         stream: true,
+        max_output_tokens: OUTPUT_RESERVE_TOKENS,
         ...(input.instructions ? { instructions: input.instructions } : {}),
       });
       return { events: mapOpenAiResponseStream(response.messages), rateLimitState: response.rateLimitState };
@@ -91,6 +94,7 @@ export const providerAdapters: ProviderAdapterRegistry = {
         input: input.prompt,
         background: true,
         store: true,
+        max_output_tokens: OUTPUT_RESERVE_TOKENS,
         ...(input.instructions ? { instructions: input.instructions } : {}),
       });
       const data = response.data;
@@ -123,8 +127,9 @@ export const providerAdapters: ProviderAdapterRegistry = {
       }, {
         model: input.model,
         input: input.prompt,
+        max_output_tokens: OUTPUT_RESERVE_TOKENS,
         ...(input.instructions ? { instructions: input.instructions } : {}),
-      });
+      }, WHOLE_RESPONSE_WAIT);
       const data = response.data;
       if (data.status !== "completed") throw incompleteTurn(incompleteReason(data));
       const text = requireText(collectText(data.output_text ?? data.output), "OpenAI");
@@ -158,7 +163,7 @@ export const providerAdapters: ProviderAdapterRegistry = {
         "anthropic-version": "2023-06-01",
       }, {
         model: input.model,
-        max_tokens: 4096,
+        max_tokens: OUTPUT_RESERVE_TOKENS,
         stream: true,
         ...(input.instructions ? { system: input.instructions } : {}),
         messages: [{ role: "user", content: input.prompt }],
@@ -175,10 +180,10 @@ export const providerAdapters: ProviderAdapterRegistry = {
         "anthropic-version": "2023-06-01",
       }, {
         model: input.model,
-        max_tokens: 4096,
+        max_tokens: OUTPUT_RESERVE_TOKENS,
         ...(input.instructions ? { system: input.instructions } : {}),
         messages: [{ role: "user", content: input.prompt }],
-      });
+      }, WHOLE_RESPONSE_WAIT);
       const data = response.data;
       requireFinished(data.stop_reason, FINISHED_STOP_REASONS.anthropic);
       const text = requireText(collectText(data.content), "Anthropic");
@@ -403,6 +408,7 @@ function openAiCompatibleAdapter({
         model: input.model,
         messages,
         stream: true,
+        [chatMaxTokensField(providerKey)]: OUTPUT_RESERVE_TOKENS,
         ...(requestStreamUsage ? { stream_options: { include_usage: true } } : {}),
       });
       return { events: mapOpenAiChatCompletionStream(response.messages), rateLimitState: response.rateLimitState };
@@ -418,7 +424,8 @@ function openAiCompatibleAdapter({
       }, {
         model: input.model,
         messages,
-      });
+        [chatMaxTokensField(providerKey)]: OUTPUT_RESERVE_TOKENS,
+      }, WHOLE_RESPONSE_WAIT);
       const data = response.data;
       requireFinished(Array.isArray(data.choices) && isRecord(data.choices[0]) ? data.choices[0].finish_reason : null, FINISHED_STOP_REASONS.chat);
       const text = requireText(collectText(Array.isArray(data.choices) ? data.choices.filter(isRecord).map((choice) => choice.message) : []), label);

src/main/services/provider-http.ts

@@ -24,6 +24,9 @@ const HEADERS_TIMEOUT_MS = 60_000;
 const BODY_TIMEOUT_MS = 300_000;
 const STREAM_IDLE_TIMEOUT_MS = 60_000;
 
+/** A non-streamed request sends headers only after the whole answer; wait as long as Node's fetch itself allows (five minutes). */
+export const WHOLE_RESPONSE_WAIT: ProviderRequestTimeouts = { headersTimeoutMs: 300_000 };
+
 export interface ProviderRequestTimeouts {
   headersTimeoutMs?: number;
   bodyTimeoutMs?: number;

src/main/services/provider-tool-turns/chat-format.ts

@@ -2,6 +2,18 @@
 import { isRecord, ProviderHttpError, type JsonRecord, type ProviderEventStreamMessage } from "../provider-http";
 import { FINISHED_STOP_REASONS, replayIn, requireFinished, type AgentTurnMessage, type AgentTurnResult, type AssistantReplay, toolCallFromJson, type ToolCall, type ToolDefinition } from "../provider-tool-turn";
 
+/** How each Chat Completions provider names the output cap: OpenAI's current field, or the older one the others document. */
+const MAX_TOKENS_FIELD: Record<string, "max_completion_tokens" | "max_tokens"> = {
+  xai: "max_completion_tokens", groq: "max_completion_tokens", cerebras: "max_completion_tokens", "azure-openai": "max_completion_tokens",
+  mistral: "max_tokens", openrouter: "max_tokens", kimi: "max_tokens", "kimi-cn": "max_tokens", "kimi-code": "max_tokens",
+};
+
+export function chatMaxTokensField(providerKey: string): "max_completion_tokens" | "max_tokens" {
+  const field = MAX_TOKENS_FIELD[providerKey];
+  if (!field) throw new Error(`No output-cap field is known for the ${providerKey} Chat Completions API.`);
+  return field;
+}
+
 /** Fields providers use for reasoning text; the first non-empty one is the provider's, as in Pi. */
 const REASONING_FIELDS = ["reasoning_content", "reasoning", "reasoning_text"] as const;
 

src/main/services/provider-tool-turns/gemini-format.ts

@@ -3,6 +3,7 @@
  * Ported from Pi's google-shared `convertMessages` / `convertTools` and the
  * Antigravity request wrapper in google-gemini-cli.
  */
+import { OUTPUT_RESERVE_TOKENS } from "../context-budget";
 import { isRecord, ProviderHttpError, type JsonRecord, type ProviderEventStreamMessage } from "../provider-http";
 import { FINISHED_STOP_REASONS, replayIn, requireFinished, toolCallFromObject, type AgentTurnMessage, type AgentTurnResult, type AssistantReplay, type ToolCall, type ToolDefinition } from "../provider-tool-turn";
 
@@ -74,6 +75,7 @@ export function antigravityRequestBody(input: {
 }): JsonRecord {
   const request: JsonRecord = {
     contents: toGeminiContents(input.model, input.messages),
+    generationConfig: { maxOutputTokens: OUTPUT_RESERVE_TOKENS },
     systemInstruction: {
       role: "user",
       parts: [
@@ -97,7 +99,7 @@ export function vertexRequestBody(input: {
   messages: AgentTurnMessage[];
   tools: ToolDefinition[];
 }): JsonRecord {
-  const body: JsonRecord = { contents: toGeminiContents(input.model, input.messages) };
+  const body: JsonRecord = { contents: toGeminiContents(input.model, input.messages), generationConfig: { maxOutputTokens: OUTPUT_RESERVE_TOKENS } };
   if (input.instructions) body.systemInstruction = { parts: [{ text: input.instructions }] };
   if (input.tools.length > 0) {
     body.tools = geminiToolDefs(input.model, input.tools);

src/main/services/provider-tool-turns/router.ts

@@ -19,13 +19,13 @@ import {
 const TURNS: Record<string, ToolTurnFn> = {
   openai: runOpenAiResponsesTurn,
   anthropic: runAnthropicTurn,
-  xai: makeChatCompletionsTurn("https://api.x.ai/v1/chat/completions", "xAI", true),
-  groq: makeChatCompletionsTurn("https://api.groq.com/openai/v1/chat/completions", "Groq", true),
-  mistral: makeChatCompletionsTurn("https://api.mistral.ai/v1/chat/completions", "Mistral"),
-  cerebras: makeChatCompletionsTurn("https://api.cerebras.ai/v1/chat/completions", "Cerebras"),
-  openrouter: makeChatCompletionsTurn("https://openrouter.ai/api/v1/chat/completions", "OpenRouter"),
-  kimi: makeChatCompletionsTurn("https://api.moonshot.ai/v1/chat/completions", "Kimi"),
-  "kimi-cn": makeChatCompletionsTurn("https://api.moonshot.cn/v1/chat/completions", "Kimi CN"),
+  xai: makeChatCompletionsTurn("xai", "https://api.x.ai/v1/chat/completions", "xAI", true),
+  groq: makeChatCompletionsTurn("groq", "https://api.groq.com/openai/v1/chat/completions", "Groq", true),
+  mistral: makeChatCompletionsTurn("mistral", "https://api.mistral.ai/v1/chat/completions", "Mistral"),
+  cerebras: makeChatCompletionsTurn("cerebras", "https://api.cerebras.ai/v1/chat/completions", "Cerebras"),
+  openrouter: makeChatCompletionsTurn("openrouter", "https://openrouter.ai/api/v1/chat/completions", "OpenRouter"),
+  kimi: makeChatCompletionsTurn("kimi", "https://api.moonshot.ai/v1/chat/completions", "Kimi"),
+  "kimi-cn": makeChatCompletionsTurn("kimi-cn", "https://api.moonshot.cn/v1/chat/completions", "Kimi CN"),
   "gpt-account": runCodexTurn,
   "github-copilot": runCopilotTurn,
   "google-antigravity": runAntigravityTurn,

src/main/services/provider-tool-turns/turns.ts

@@ -4,17 +4,18 @@
  * {@link AgentTurnResult}. Faithful ports of Pi's provider request handlers.
  */
 import { release as osRelease, arch as osArch, platform as osPlatform } from "node:os";
-import { postEventStream, postJson, type JsonRecord } from "../provider-http";
+import { postEventStream, postJson, WHOLE_RESPONSE_WAIT, type JsonRecord } from "../provider-http";
 import type { AgentTurnMessage, AgentTurnResult, ProviderToolTurnInput, TurnCredential } from "../provider-tool-turn";
 import { accumulateResponsesStream, parseResponsesOutput, responsesToolDefs, toResponsesInput } from "./responses-format";
 import { anthropicToolDefs, parseAnthropicContent, toAnthropicMessages } from "./anthropic-format";
-import { accumulateChatStream, chatToolDefs, parseChatChoice, toChatMessages } from "./chat-format";
+import { accumulateChatStream, chatMaxTokensField, chatToolDefs, parseChatChoice, toChatMessages } from "./chat-format";
 import { accumulateGeminiStream, antigravityRequestBody, parseGeminiResponse, vertexRequestBody } from "./gemini-format";
 import { bedrockToolConfig, parseBedrockOutput, toBedrockMessages } from "./bedrock-format";
 import { signAwsRequest } from "./aws-sigv4";
 import { getGcpAccessToken } from "./gcp-auth";
 import { COPILOT_HEADERS, copilotBaseUrl } from "../oauth/github-copilot-flow";
 import { KIMI_CODE_BASE_URL } from "../oauth/kimi-code-flow";
+import { OUTPUT_RESERVE_TOKENS } from "../context-budget";
 
 const ANTIGRAVITY_VERSION = "1.21.9";
 const ANTIGRAVITY_ENDPOINT = "https://cloudcode-pa.googleapis.com";
@@ -44,29 +45,25 @@ export async function runOpenAiResponsesTurn(input: ProviderToolTurnInput): Prom
     tools: responsesToolDefs(input.tools),
     tool_choice: "auto",
     store: false,
+    max_output_tokens: OUTPUT_RESERVE_TOKENS,
     ...(input.instructions ? { instructions: input.instructions } : {}),
   };
-  const response = await postJson("https://api.openai.com/v1/responses", { authorization: `Bearer ${requireApiKey(input.credential, "OpenAI")}` }, body);
+  const response = await postJson("https://api.openai.com/v1/responses", { authorization: `Bearer ${requireApiKey(input.credential, "OpenAI")}` }, body, WHOLE_RESPONSE_WAIT);
   const parsed = parseResponsesOutput(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }
 
 // ---- OpenAI Chat Completions, streamed (xAI, Groq, Mistral, Cerebras, OpenRouter, Kimi, Kimi CN) ----
 
-/**
- * Streaming is required, not an optimization: a non-streaming completion
- * sends its response headers only after the WHOLE generation finishes, so a
- * reasoning model that thinks past the 60s header deadline gets aborted with
- * "Provider request timed out." even though it is working. Streamed turns
- * emit chunks continuously and only a truly dead connection times out.
- */
-async function runChatCompletionsStream(endpoint: string, headers: Record<string, string>, input: ProviderToolTurnInput, requestUsage = false): Promise<AgentTurnResult> {
+/** Streamed so a long think never meets a header deadline; only a stream that goes idle times out. */
+async function runChatCompletionsStream(providerKey: string, endpoint: string, headers: Record<string, string>, input: ProviderToolTurnInput, requestUsage = false): Promise<AgentTurnResult> {
   const body: JsonRecord = {
     model: input.model,
     messages: toChatMessages(input.instructions, input.messages),
     tools: chatToolDefs(input.tools),
     tool_choice: "auto",
     stream: true,
+    [chatMaxTokensField(providerKey)]: OUTPUT_RESERVE_TOKENS,
     // Some providers only report a stream's token usage when asked; the others send it unasked and may reject the field.
     ...(requestUsage ? { stream_options: { include_usage: true } } : {}),
   };
@@ -74,8 +71,8 @@ async function runChatCompletionsStream(endpoint: string, headers: Record<string
   return { ...(await accumulateChatStream(response.messages)), rateLimitState: response.rateLimitState };
 }
 
-export function makeChatCompletionsTurn(endpoint: string, label: string, requestUsage = false): (input: ProviderToolTurnInput) => Promise<AgentTurnResult> {
-  return async (input) => runChatCompletionsStream(endpoint, { authorization: `Bearer ${requireApiKey(input.credential, label)}` }, input, requestUsage);
+export function makeChatCompletionsTurn(providerKey: string, endpoint: string, label: string, requestUsage = false): (input: ProviderToolTurnInput) => Promise<AgentTurnResult> {
+  return async (input) => runChatCompletionsStream(providerKey, endpoint, { authorization: `Bearer ${requireApiKey(input.credential, label)}` }, input, requestUsage);
 }
 
 // ---- Anthropic Messages (api key) ----
@@ -83,12 +80,12 @@ export function makeChatCompletionsTurn(endpoint: string, label: string, request
 export async function runAnthropicTurn(input: ProviderToolTurnInput): Promise<AgentTurnResult> {
   const body: JsonRecord = {
     model: input.model,
-    max_tokens: 4096,
+    max_tokens: OUTPUT_RESERVE_TOKENS,
     tools: anthropicToolDefs(input.tools),
     messages: toAnthropicMessages(input.messages),
     ...(input.instructions ? { system: input.instructions } : {}),
   };
-  const response = await postJson("https://api.anthropic.com/v1/messages", { "x-api-key": requireApiKey(input.credential, "Anthropic"), "anthropic-version": "2023-06-01" }, body);
+  const response = await postJson("https://api.anthropic.com/v1/messages", { "x-api-key": requireApiKey(input.credential, "Anthropic"), "anthropic-version": "2023-06-01" }, body, WHOLE_RESPONSE_WAIT);
   const parsed = parseAnthropicContent(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }
@@ -102,7 +99,7 @@ export async function runClaudeProTurn(input: ProviderToolTurnInput): Promise<Ag
   ];
   const body: JsonRecord = {
     model: input.model,
-    max_tokens: 4096,
+    max_tokens: OUTPUT_RESERVE_TOKENS,
     tools: anthropicToolDefs(input.tools),
     messages: toAnthropicMessages(input.messages),
     system,
@@ -114,7 +111,7 @@ export async function runClaudeProTurn(input: ProviderToolTurnInput): Promise<Ag
     "anthropic-dangerous-direct-browser-access": "true",
     "user-agent": "claude-cli/2.1.75",
     "x-app": "cli",
-  }, body);
+  }, body, WHOLE_RESPONSE_WAIT);
   const parsed = parseAnthropicContent(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }
@@ -123,7 +120,7 @@ export async function runClaudeProTurn(input: ProviderToolTurnInput): Promise<Ag
 
 export async function runKimiCodeTurn(input: ProviderToolTurnInput): Promise<AgentTurnResult> {
   const access = requireAccessToken(input.credential, "Kimi Code");
-  return runChatCompletionsStream(`${KIMI_CODE_BASE_URL}/chat/completions`, { authorization: `Bearer ${access}` }, input);
+  return runChatCompletionsStream("kimi-code", `${KIMI_CODE_BASE_URL}/chat/completions`, { authorization: `Bearer ${access}` }, input);
 }
 
 // ---- GPT account / OpenAI Codex (OAuth, SSE) ----
@@ -142,6 +139,7 @@ export async function runCodexTurn(input: ProviderToolTurnInput): Promise<AgentT
     tool_choice: "auto",
     parallel_tool_calls: true,
     tools: responsesToolDefs(input.tools, null),
+    // No output cap: the ChatGPT backend takes none, and neither Codex CLI nor Pi sends one.
   };
   const response = await postEventStream(`${CODEX_BASE_URL}/codex/responses`, {
     Authorization: `Bearer ${access}`,
@@ -164,6 +162,7 @@ export async function runCopilotTurn(input: ProviderToolTurnInput): Promise<Agen
     tools: responsesToolDefs(input.tools),
     tool_choice: "auto",
     store: false,
+    max_output_tokens: OUTPUT_RESERVE_TOKENS,
     ...(input.instructions ? { instructions: input.instructions } : {}),
   };
   const response = await postJson(`${baseUrl}/responses`, {
@@ -171,7 +170,7 @@ export async function runCopilotTurn(input: ProviderToolTurnInput): Promise<Agen
     ...COPILOT_HEADERS,
     "X-Initiator": lastMessageIsUser(input.messages) ? "user" : "agent",
     "Openai-Intent": "conversation-edits",
-  }, body);
+  }, body, WHOLE_RESPONSE_WAIT);
   const parsed = parseResponsesOutput(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }
@@ -186,8 +185,9 @@ export async function runCustomOpenAiTurn(input: ProviderToolTurnInput): Promise
     tools: chatToolDefs(input.tools),
     tool_choice: "auto",
     stream: false,
+    // No output cap: whatever serves a custom endpoint decides which cap field, if any, it accepts.
   };
-  const response = await postJson(`${input.credential.baseUrl}/chat/completions`, { authorization: `Bearer ${requireApiKey(input.credential, "Custom OpenAI-compatible provider")}` }, body);
+  const response = await postJson(`${input.credential.baseUrl}/chat/completions`, { authorization: `Bearer ${requireApiKey(input.credential, "Custom OpenAI-compatible provider")}` }, body, WHOLE_RESPONSE_WAIT);
   const parsed = parseChatChoice(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }
@@ -198,12 +198,12 @@ export async function runCustomAnthropicTurn(input: ProviderToolTurnInput): Prom
   if (!input.credential.baseUrl) throw new Error("Custom Anthropic-compatible provider is missing its base URL.");
   const body: JsonRecord = {
     model: input.model,
-    max_tokens: 4096,
+    max_tokens: OUTPUT_RESERVE_TOKENS,
     tools: anthropicToolDefs(input.tools),
     messages: toAnthropicMessages(input.messages),
     ...(input.instructions ? { system: input.instructions } : {}),
   };
-  const response = await postJson(`${input.credential.baseUrl}/v1/messages`, { "x-api-key": requireApiKey(input.credential, "Custom Anthropic-compatible provider"), "anthropic-version": "2023-06-01" }, body);
+  const response = await postJson(`${input.credential.baseUrl}/v1/messages`, { "x-api-key": requireApiKey(input.credential, "Custom Anthropic-compatible provider"), "anthropic-version": "2023-06-01" }, body, WHOLE_RESPONSE_WAIT);
   const parsed = parseAnthropicContent(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }
@@ -241,9 +241,10 @@ export async function runAzureTurn(input: ProviderToolTurnInput): Promise<AgentT
     tools: chatToolDefs(input.tools),
     tool_choice: "auto",
     stream: false,
+    [chatMaxTokensField("azure-openai")]: OUTPUT_RESERVE_TOKENS,
   };
   const url = `${input.credential.baseUrl}/openai/deployments/${input.credential.deployment}/chat/completions?api-version=2024-10-21`;
-  const response = await postJson(url, { "api-key": apiKey }, body);
+  const response = await postJson(url, { "api-key": apiKey }, body, WHOLE_RESPONSE_WAIT);
   const parsed = parseChatChoice(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }
@@ -255,7 +256,8 @@ export async function runBedrockTurn(input: ProviderToolTurnInput): Promise<Agen
   if (!region || !accessKeyId || !secretAccessKey) throw new Error("AWS Bedrock credential is incomplete.");
   const converse: JsonRecord = {
     messages: toBedrockMessages(input.messages),
-    inferenceConfig: { maxTokens: 4096 },
+    // Output limits differ per Bedrock model family; only Claude's are known to cover the reserve, as in Pi.
+    ...(input.model.includes("anthropic.") ? { inferenceConfig: { maxTokens: OUTPUT_RESERVE_TOKENS } } : {}),
     toolConfig: bedrockToolConfig(input.tools),
     ...(input.instructions ? { system: [{ text: input.instructions }] } : {}),
   };
@@ -267,7 +269,7 @@ export async function runBedrockTurn(input: ProviderToolTurnInput): Promise<Agen
     body: bodyString,
     signer: { region, service: "bedrock", accessKeyId, secretAccessKey, sessionToken },
   });
-  const response = await postJson(signed.url, signed.headers, converse);
+  const response = await postJson(signed.url, signed.headers, converse, WHOLE_RESPONSE_WAIT);
   const parsed = parseBedrockOutput(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }
@@ -280,7 +282,7 @@ export async function runVertexTurn(input: ProviderToolTurnInput): Promise<Agent
   const token = await getGcpAccessToken(serviceAccountJson);
   const body = vertexRequestBody({ model: input.model, instructions: input.instructions, messages: input.messages, tools: input.tools });
   const url = `https://${region}-aiplatform.googleapis.com/v1/projects/${projectId}/locations/${region}/publishers/google/models/${input.model}:generateContent`;
-  const response = await postJson(url, { authorization: `Bearer ${token}` }, body);
+  const response = await postJson(url, { authorization: `Bearer ${token}` }, body, WHOLE_RESPONSE_WAIT);
   const parsed = parseGeminiResponse(response.data);
   return { ...parsed, rawResponseJson: JSON.stringify(response.data), rateLimitState: response.rateLimitState };
 }

tests/unit/stream-usage-request.test.ts

@@ -25,8 +25,10 @@ describe("stream usage requests", () => {
       for await (const event of result.events) void event;
     }
     expect(bodies.map((body) => body.stream_options ?? null)).toEqual([{ include_usage: true }, { include_usage: true }, null, null]);
+    expect(bodies.map((body) => body.max_completion_tokens ?? body.max_tokens)).toEqual([16_000, 16_000, 16_000, 16_000]);
+    expect(bodies.map((body) => "max_completion_tokens" in body)).toEqual([true, true, false, true]);
 
-    await makeChatCompletionsTurn("https://api.x.ai/v1/chat/completions", "xAI", true)({ credential: { apiKey: "k" }, model: "m", instructions: null, messages: [{ role: "user", text: "hi" }], tools: [] });
+    await makeChatCompletionsTurn("xai", "https://api.x.ai/v1/chat/completions", "xAI", true)({ credential: { apiKey: "k" }, model: "m", instructions: null, messages: [{ role: "user", text: "hi" }], tools: [] });
     expect(bodies.at(-1)?.stream_options).toEqual({ include_usage: true });
   });
 });

tests/unit/turn-request-bounds.test.ts

@@ -0,0 +1,72 @@
+import { beforeEach, describe, expect, test, vi } from "vitest";
+import type { ProviderRequestTimeouts } from "../../src/main/services/provider-http";
+
+const sent: Array<{ streamed: boolean; body: Record<string, unknown>; timeouts: ProviderRequestTimeouts | undefined }> = [];
+const STOP = new Error("captured");
+
+vi.mock("../../src/main/services/provider-http", async (original) => ({
+  ...(await original<typeof import("../../src/main/services/provider-http")>()),
+  postJson: async (_url: string, _headers: unknown, body: Record<string, unknown>, timeouts?: ProviderRequestTimeouts) => { sent.push({ streamed: false, body, timeouts }); throw STOP; },
+  postEventStream: async (_url: string, _headers: unknown, body: Record<string, unknown>, timeouts?: ProviderRequestTimeouts) => { sent.push({ streamed: true, body, timeouts }); throw STOP; },
+}));
+vi.mock("../../src/main/services/provider-tool-turns/gcp-auth", () => ({ getGcpAccessToken: async () => "token" }));
+
+const { selectToolTurn } = await import("../../src/main/services/provider-tool-turns/router");
+const { OUTPUT_RESERVE_TOKENS } = await import("../../src/main/services/context-budget");
+
+const credential = {
+  apiKey: "k", accessToken: "tid=1;exp=9999999999", accountId: "acct", projectId: "proj", baseUrl: "https://example.test",
+  deployment: "dep", region: "us-east-1", accessKeyId: "AKIA", secretAccessKey: "secret", serviceAccountJson: "{}",
+};
+
+async function capture(providerKey: string, model = "m"): Promise<(typeof sent)[number]> {
+  await expect(selectToolTurn(providerKey)({ credential, model, instructions: null, messages: [{ role: "user", text: "hi" }], tools: [] })).rejects.toBe(STOP);
+  const request = sent.at(-1);
+  if (!request) throw new Error(`${providerKey} sent nothing`);
+  return request;
+}
+
+/** The output cap a request carries, whatever the API calls it. */
+function outputCap(body: Record<string, unknown>): unknown {
+  const request = (body.request ?? body) as Record<string, unknown>;
+  const generation = request.generationConfig as Record<string, unknown> | undefined;
+  const inference = body.inferenceConfig as Record<string, unknown> | undefined;
+  return body.max_output_tokens ?? body.max_tokens ?? body.max_completion_tokens ?? generation?.maxOutputTokens ?? inference?.maxTokens ?? null;
+}
+
+beforeEach(() => { sent.length = 0; });
+
+describe("every agent turn has the same output cap and a wait that fits how it is sent", () => {
+  test("each provider caps output at the reserve the context budget keeps, in the field its API names", async () => {
+    const fields: Record<string, string> = {
+      openai: "max_output_tokens", "github-copilot": "max_output_tokens",
+      anthropic: "max_tokens", "claude-pro": "max_tokens", "custom-anthropic": "max_tokens",
+      xai: "max_completion_tokens", groq: "max_completion_tokens", cerebras: "max_completion_tokens", "azure-openai": "max_completion_tokens",
+      mistral: "max_tokens", openrouter: "max_tokens", kimi: "max_tokens", "kimi-cn": "max_tokens", "kimi-code": "max_tokens",
+    };
+    for (const [key, field] of Object.entries(fields)) {
+      const { body } = await capture(key);
+      expect([key, body[field]]).toEqual([key, OUTPUT_RESERVE_TOKENS]);
+    }
+    expect(outputCap((await capture("google-antigravity", "gemini-3-pro")).body)).toBe(OUTPUT_RESERVE_TOKENS);
+    expect(outputCap((await capture("vertex-ai", "gemini-3-pro")).body)).toBe(OUTPUT_RESERVE_TOKENS);
+    expect(outputCap((await capture("aws-bedrock", "anthropic.claude-sonnet-4-5")).body)).toBe(OUTPUT_RESERVE_TOKENS);
+  });
+
+  test("Codex, custom OpenAI endpoints and non-Claude Bedrock models get no cap: none taken, field unknown, or limits that differ per model", async () => {
+    expect(outputCap((await capture("gpt-account")).body)).toBeNull();
+    expect(outputCap((await capture("custom-openai")).body)).toBeNull();
+    expect(outputCap((await capture("aws-bedrock", "meta.llama3-70b-instruct-v1:0")).body)).toBeNull();
+  });
+
+  test("turns that wait for a whole response allow a long think before headers; streamed turns keep the idle deadline", async () => {
+    for (const key of ["openai", "anthropic", "claude-pro", "github-copilot", "custom-openai", "custom-anthropic", "azure-openai", "aws-bedrock", "vertex-ai"]) {
+      const { streamed, timeouts } = await capture(key);
+      expect([key, streamed, timeouts?.headersTimeoutMs]).toEqual([key, false, 300_000]);
+    }
+    for (const key of ["xai", "kimi-code", "gpt-account", "google-antigravity"]) {
+      const { streamed, timeouts } = await capture(key);
+      expect([key, streamed, timeouts?.headersTimeoutMs]).toEqual([key, true, undefined]);
+    }
+  });
+});