Merge pull request #37 from patlux/feat/model-catalog-runtime

feat(models): add model-aware runtime metadata

index.ts

@@ -13,50 +13,42 @@
  */
 
 import { AssistantMessageEventStream } from "@earendil-works/pi-ai"
-import { getAgentDir, type ExtensionAPI } from "@earendil-works/pi-coding-agent"
+import {
+  getAgentDir,
+  type ExtensionAPI,
+  type ExtensionCommandContext,
+  type ProviderConfig,
+} from "@earendil-works/pi-coding-agent"
 import { join } from "node:path"
 
 import { getApiKey as getStoredApiKey } from "./src/converters.ts"
 import { COMMAND_CODE_CLI_VERSION, createStreamCommandCode, DEFAULT_API_BASE } from "./src/core.ts"
 import { calculateCommandCodeCost } from "./src/cost.ts"
-import { DEFAULT_MODELS_URL, loadCommandCodeModels } from "./src/models.ts"
+import {
+  DEFAULT_MODELS_URL,
+  getModelsTimeoutMs,
+  loadCommandCodeModels,
+  thinkingMetadataForModel,
+  type CommandCodeModel,
+} from "./src/models.ts"
 import { getApiKey as getOAuthApiKey, login, refreshToken } from "./src/oauth.ts"
 import { MODEL_COSTS, ZERO_MODEL_COST } from "./src/pricing.ts"
+import { createCommandCodeRuntime } from "./src/runtime.ts"
 
-const API_BASE = process.env.COMMANDCODE_API_BASE ?? DEFAULT_API_BASE
+function createProviderConfig(
-const MODELS_URL = process.env.COMMANDCODE_MODELS_URL ?? DEFAULT_MODELS_URL
+  models: readonly CommandCodeModel[],
-const MODELS_CACHE_PATH =
+  apiBase: string,
-  process.env.COMMANDCODE_MODELS_CACHE ?? join(getAgentDir(), "commandcode-models.json")
+  streamCommandCode: ProviderConfig["streamSimple"],
-
+): ProviderConfig {
-const streamCommandCode = createStreamCommandCode({
+  return {
-  createStream: () => new AssistantMessageEventStream(),
-  calculateCost: calculateCommandCodeCost,
-  apiBase: API_BASE,
-})
-
-// ---------------------------------------------------------------------------
-// Extension entry point
-// ---------------------------------------------------------------------------
-
-export default async function (pi: ExtensionAPI) {
-  const storedApiKey = getStoredApiKey()
-  const { models, warning } = await loadCommandCodeModels({
-    url: MODELS_URL,
-    cachePath: MODELS_CACHE_PATH,
-  })
-
-  if (warning) console.warn(`[commandcode] ${warning}`)
-
-  pi.registerProvider("commandcode", {
     name: "Command Code",
-    baseUrl: API_BASE,
+    baseUrl: apiBase,
-    apiKey: storedApiKey,
+    apiKey: "$COMMANDCODE_API_KEY",
     authHeader: true,
     api: "commandcode-custom",
     streamSimple: streamCommandCode,
     headers: {
-      "x-command-code-version": COMMAND_CODE_CLI_VERSION,
+      "x-commandcode-version": COMMAND_CODE_CLI_VERSION,
-      "x-cli-environment": "production",
     },
     oauth: {
       name: "Command Code",
@@ -68,10 +60,38 @@ export default async function (pi: ExtensionAPI) {
       id: model.id,
       name: model.name,
       reasoning: model.reasoning,
+      ...(thinkingMetadataForModel(model.id) ?? {}),
       input: ["text"] as const,
       cost: MODEL_COSTS[model.id] ?? ZERO_MODEL_COST,
       contextWindow: model.contextWindow,
       maxTokens: model.maxTokens,
     })),
+  }
+}
+
+export default async function (pi: ExtensionAPI) {
+  const apiBase = process.env.COMMANDCODE_API_BASE ?? DEFAULT_API_BASE
+  const modelsUrl = process.env.COMMANDCODE_MODELS_URL ?? DEFAULT_MODELS_URL
+  const modelsTimeoutMs = getModelsTimeoutMs()
+  const modelsCachePath =
+    process.env.COMMANDCODE_MODELS_CACHE ?? join(getAgentDir(), "commandcode-models.json")
+  const streamCommandCode = createStreamCommandCode({
+    createStream: () => new AssistantMessageEventStream(),
+    calculateCost: calculateCommandCodeCost,
+    apiBase,
   })
+
+  const runtime = createCommandCodeRuntime<ProviderConfig, ExtensionCommandContext>(pi, {
+    endpoint: modelsUrl,
+    cachePath: modelsCachePath,
+    loadModels: () =>
+      loadCommandCodeModels({
+        url: modelsUrl,
+        cachePath: modelsCachePath,
+        timeoutMs: modelsTimeoutMs,
+      }),
+    createProviderConfig: (models) => createProviderConfig(models, apiBase, streamCommandCode),
+  })
+
+  await runtime.initialize()
 }

src/core.ts

@@ -134,6 +134,15 @@ function generateMaxTokens(model: ModelLike, options?: StreamOptions): number {
   )
 }
 
+function mappedReasoningEffort(model: ModelLike, options?: StreamOptions): string | undefined {
+  const level = options?.reasoning
+  if (!level || level === "off" || !model.reasoning) return undefined
+
+  const effortMap = model.thinking?.effortMap ?? model.thinkingLevelMap
+  const mapped = effortMap?.[level]
+  return typeof mapped === "string" && mapped !== "off" ? mapped : undefined
+}
+
 export function projectSlugFromPath(pathName: string): string {
   const slug = pathName
     .toLowerCase()
@@ -424,6 +433,7 @@ export function createStreamCommandCode(deps: CoreDependencies) {
 
         const workingDir = cwd()
         const threadId = uuid()
+        const reasoningEffort = mappedReasoningEffort(model, options)
 
         let body: unknown = {
           config: {
@@ -448,6 +458,7 @@ export function createStreamCommandCode(deps: CoreDependencies) {
             max_tokens: generateMaxTokens(model, options),
             temperature: 0.3,
             stream: true,
+            ...(reasoningEffort ? { reasoning_effort: reasoningEffort } : {}),
           },
           threadId,
         }

src/models.ts

@@ -2,10 +2,97 @@ import { mkdir, readFile, rename, rm, writeFile } from "node:fs/promises"
 import { dirname } from "node:path"
 
 export const DEFAULT_MODELS_URL = "https://api.commandcode.ai/provider/v1/models"
+export const DEFAULT_MODELS_TIMEOUT_MS = 10_000
 
 const DEFAULT_MAX_OUTPUT_TOKENS = 65_536
 const MODEL_CACHE_VERSION = 1
 
+export type PiThinkingLevel = "off" | "minimal" | "low" | "medium" | "high" | "xhigh" | "max"
+
+type CommandCodeReasoningEffort = Exclude<PiThinkingLevel, "off">
+
+/**
+ * Per-model reasoning efforts supported by Command Code's generate endpoint.
+ *
+ * The Provider API does not expose reasoning metadata. This is an exact
+ * snapshot of `reasoningEfforts` from the command-code@1.14.1 model catalog
+ * (`packages/shared/src/model-catalog.ts`, also published in the generated
+ * `dist/bundled/command-code-knowledge/reference/models.md`). Models omitted
+ * here let Command Code choose their reasoning depth, matching the CLI.
+ */
+export const MODEL_EFFORTS: Readonly<Record<string, readonly CommandCodeReasoningEffort[]>> = {
+  "Qwen/Qwen3.8-Max": ["low", "medium", "xhigh"],
+  "claude-fable-5": ["low", "medium", "high", "xhigh", "max"],
+  "claude-opus-4-7": ["low", "medium", "high", "xhigh", "max"],
+  "claude-opus-4-8": ["low", "medium", "high", "xhigh", "max"],
+  "claude-opus-5": ["low", "medium", "high", "xhigh", "max"],
+  "claude-sonnet-4-6": ["low", "medium", "high", "xhigh", "max"],
+  "claude-sonnet-5": ["low", "medium", "high", "xhigh", "max"],
+  "deepseek/deepseek-v4-flash": ["high", "max"],
+  "deepseek/deepseek-v4-pro": ["high", "max"],
+  "gpt-5.3-codex": ["low", "medium", "high", "xhigh"],
+  "gpt-5.4": ["low", "medium", "high", "xhigh"],
+  "gpt-5.4-mini": ["low", "medium", "high"],
+  "gpt-5.5": ["low", "medium", "high", "xhigh"],
+  "gpt-5.6-luna": ["low", "medium", "high", "xhigh", "max"],
+  "gpt-5.6-sol": ["low", "medium", "high", "xhigh", "max"],
+  "gpt-5.6-terra": ["low", "medium", "high", "xhigh", "max"],
+  "google/gemini-3.1-flash-lite": ["low", "medium", "high"],
+  "google/gemini-3.5-flash": ["low", "medium", "high"],
+  "google/gemini-3.5-flash-lite": ["low", "medium", "high"],
+  "google/gemini-3.6-flash": ["low", "medium", "high"],
+  "sakana/fugu-ultra": ["high", "xhigh"],
+  "xai/grok-4.5": ["low", "medium", "high"],
+  "zai-org/GLM-5.2": ["high", "max"],
+}
+
+const PI_THINKING_LEVELS: readonly PiThinkingLevel[] = [
+  "off",
+  "minimal",
+  "low",
+  "medium",
+  "high",
+  "xhigh",
+  "max",
+]
+
+export function thinkingLevelMapForEfforts(
+  efforts: readonly string[],
+): Partial<Record<PiThinkingLevel, string | null>> {
+  const map: Partial<Record<PiThinkingLevel, string | null>> = {}
+  for (const level of PI_THINKING_LEVELS) {
+    if (level === "off") continue
+    map[level] = efforts.includes(level) ? level : null
+  }
+  return map
+}
+
+export interface ThinkingMetadata {
+  thinkingLevelMap: Partial<Record<PiThinkingLevel, string | null>>
+  thinking: {
+    mode: "effort"
+    effortMap: Partial<Record<CommandCodeReasoningEffort, string>>
+    efforts: readonly CommandCodeReasoningEffort[]
+  }
+}
+
+export function thinkingMetadataForModel(modelId: string): ThinkingMetadata | undefined {
+  const efforts = MODEL_EFFORTS[modelId]
+  if (!efforts) return undefined
+  return {
+    thinkingLevelMap: thinkingLevelMapForEfforts(efforts),
+    thinking: {
+      mode: "effort",
+      effortMap: Object.fromEntries(efforts.map((effort) => [effort, effort])),
+      efforts,
+    },
+  }
+}
+
+function isReasoningModel(modelId: string): boolean {
+  return MODEL_EFFORTS[modelId] !== undefined
+}
+
 interface ApiModel {
   id: string
   name: string
@@ -23,6 +110,8 @@ export interface CommandCodeModel {
 interface FetchCommandCodeModelsOptions {
   url?: string
   fetchImpl?: typeof fetch
+  signal?: AbortSignal
+  timeoutMs?: number
 }
 
 interface LoadCommandCodeModelsOptions extends FetchCommandCodeModelsOptions {
@@ -74,10 +163,12 @@ function parseApiModel(value: unknown): ApiModel {
 function parseCachedModel(value: unknown): CommandCodeModel {
   if (!isRecord(value)) throw new Error("Expected cached model entry to be an object")
 
+  const id = stringField(value, "id")
+  booleanField(value, "reasoning")
   return {
-    id: stringField(value, "id"),
+    id,
     name: stringField(value, "name"),
-    reasoning: booleanField(value, "reasoning"),
+    reasoning: isReasoningModel(id),
     contextWindow: positiveNumberField(value, "contextWindow"),
     maxTokens: positiveNumberField(value, "maxTokens"),
   }
@@ -92,6 +183,85 @@ function errorMessage(error: unknown): string {
   return error instanceof Error ? error.message : String(error)
 }
 
+function abortError(reason: unknown): Error {
+  if (reason instanceof Error) return reason
+  return new DOMException("The operation was aborted", "AbortError")
+}
+
+function configuredTimeoutMs(timeoutMs: number | undefined): number {
+  return timeoutMs !== undefined && Number.isFinite(timeoutMs) && timeoutMs > 0
+    ? timeoutMs
+    : DEFAULT_MODELS_TIMEOUT_MS
+}
+
+export function getModelsTimeoutMs(env: NodeJS.ProcessEnv = process.env): number {
+  const raw = env.COMMANDCODE_MODELS_TIMEOUT_MS
+  if (!raw) return DEFAULT_MODELS_TIMEOUT_MS
+
+  const parsed = Number(raw)
+  return configuredTimeoutMs(parsed)
+}
+
+class ModelDiscoveryTimeoutError extends Error {
+  constructor(timeoutMs: number) {
+    super(`Command Code model discovery timed out after ${timeoutMs}ms`)
+    this.name = "ModelDiscoveryTimeoutError"
+  }
+}
+
+function runWithTimeout<T>(
+  operation: (signal: AbortSignal) => Promise<T>,
+  timeoutMs: number,
+  externalSignal: AbortSignal | undefined,
+): Promise<T> {
+  const controller = new AbortController()
+  let timer: ReturnType<typeof setTimeout> | undefined
+  let settled = false
+  let onExternalAbort: (() => void) | undefined
+
+  return new Promise<T>((resolve, reject) => {
+    const cleanup = () => {
+      if (timer !== undefined) clearTimeout(timer)
+      if (onExternalAbort && externalSignal) {
+        externalSignal.removeEventListener("abort", onExternalAbort)
+      }
+    }
+
+    const resolveOnce = (value: T) => {
+      if (settled) return
+      settled = true
+      cleanup()
+      resolve(value)
+    }
+
+    const rejectOnce = (error: unknown) => {
+      if (settled) return
+      settled = true
+      cleanup()
+      reject(error)
+    }
+
+    const abort = (reason: unknown) => {
+      const error = abortError(reason)
+      controller.abort(error)
+      rejectOnce(error)
+    }
+
+    if (externalSignal?.aborted) {
+      abort(externalSignal.reason)
+      return
+    }
+
+    onExternalAbort = () => abort(externalSignal?.reason)
+    externalSignal?.addEventListener("abort", onExternalAbort, { once: true })
+    timer = setTimeout(() => abort(new ModelDiscoveryTimeoutError(timeoutMs)), timeoutMs)
+
+    Promise.resolve()
+      .then(() => operation(controller.signal))
+      .then(resolveOnce, rejectOnce)
+  })
+}
+
 export function commandCodeModelsFromApiResponse(value: unknown): readonly CommandCodeModel[] {
   if (!isRecord(value)) throw new Error("Expected models response to be an object")
   if (value.object !== "list") throw new Error("Expected models response object to be 'list'")
@@ -102,7 +272,7 @@ export function commandCodeModelsFromApiResponse(value: unknown): readonly Comma
   return data.map(parseApiModel).map((model) => ({
     id: model.id,
     name: `${model.name} (CC)`,
-    reasoning: true,
+    reasoning: isReasoningModel(model.id),
     contextWindow: model.contextLength,
     maxTokens: Math.min(model.contextLength, DEFAULT_MAX_OUTPUT_TOKENS),
   }))
@@ -123,19 +293,26 @@ export async function fetchCommandCodeModels(
 ): Promise<readonly CommandCodeModel[]> {
   const url = options.url ?? DEFAULT_MODELS_URL
   const fetchImpl = options.fetchImpl ?? fetch
-  const response = await fetchImpl(url, {
+  const body: unknown = await runWithTimeout(
-    headers: {
+    async (signal) => {
-      accept: "application/json",
+      const response = await fetchImpl(url, {
+        headers: {
+          accept: "application/json",
+        },
+        signal,
+      })
+
+      if (!response.ok) {
+        throw new Error(
+          `Failed to fetch Command Code models: ${response.status} ${response.statusText}`,
+        )
+      }
+
+      return await response.json()
     },
-  })
+    configuredTimeoutMs(options.timeoutMs),
-
+    options.signal,
-  if (!response.ok) {
+  )
-    throw new Error(
-      `Failed to fetch Command Code models: ${response.status} ${response.statusText}`,
-    )
-  }
-
-  const body: unknown = await response.json()
   return requireModels(commandCodeModelsFromApiResponse(body))
 }
 
@@ -187,6 +364,8 @@ export async function loadCommandCodeModels(
       }
     }
   } catch (liveError) {
+    if (options.signal?.aborted) throw abortError(options.signal.reason ?? liveError)
+
     try {
       const models = await readCommandCodeModelsCache(cachePath)
       return {
@@ -198,7 +377,7 @@ export async function loadCommandCodeModels(
       return {
         models: [],
         source: "empty",
-        warning: `Could not refresh the Command Code model catalog (${errorMessage(liveError)}), and no valid cached catalog is available at ${cachePath} (${errorMessage(cacheError)}). Command Code models will remain unavailable until /reload succeeds.`,
+        warning: `Could not refresh the Command Code model catalog (${errorMessage(liveError)}), and no valid cached catalog is available at ${cachePath} (${errorMessage(cacheError)}). Command Code models will remain unavailable until /commandcode-refresh succeeds.`,
       }
     }
   }

src/runtime.ts

@@ -0,0 +1,279 @@
+import type { CommandCodeModel, LoadCommandCodeModelsResult } from "./models.ts"
+
+export interface CommandCodeUi {
+  notify(message: string, type?: "info" | "warning" | "error"): void
+}
+
+export interface CommandCodeCommandContext {
+  ui: CommandCodeUi
+  waitForIdle?: () => Promise<void>
+}
+
+export interface CommandCodeRuntimeApi<
+  TProviderConfig,
+  TContext extends CommandCodeCommandContext,
+> {
+  registerProvider(name: string, config: TProviderConfig): void
+  registerCommand(
+    name: string,
+    options: {
+      description: string
+      handler: (args: string, ctx: TContext) => Promise<void>
+    },
+  ): void
+}
+
+export interface CommandCodeRuntimeOptions<TProviderConfig> {
+  endpoint: string
+  cachePath: string
+  loadModels: () => Promise<LoadCommandCodeModelsResult>
+  createProviderConfig: (models: readonly CommandCodeModel[]) => TProviderConfig
+  now?: () => number
+  logWarning?: (message: string) => void
+}
+
+export interface CommandCodeRuntimeStatus {
+  source: LoadCommandCodeModelsResult["source"]
+  modelCount: number
+  lastSuccess?: number
+  lastAttempt?: number
+  cachePath: string
+  endpoint: string
+  warning?: string
+  refreshing: boolean
+}
+
+export interface CommandCodeRefreshResult {
+  refreshed: boolean
+  source: CommandCodeRuntimeStatus["source"]
+  modelCount: number
+  warning?: string
+}
+
+const REDACTED = "[redacted]"
+
+function errorMessage(error: unknown): string {
+  return error instanceof Error ? error.message : String(error)
+}
+
+function redactUrl(value: string): string {
+  try {
+    const url = new URL(value)
+    return `${url.protocol}//${url.host}${url.pathname}`
+  } catch {
+    return REDACTED
+  }
+}
+
+export function redactDiagnosticText(value: string): string {
+  const redactedUrls = value.replace(/https?:\/\/[^\s)]+/gi, (match) => redactUrl(match))
+  return redactedUrls
+    .replace(/\bBearer\s+[A-Za-z0-9._~+/=-]+/gi, `Bearer ${REDACTED}`)
+    .replace(/\b(?:user|cc)_[A-Za-z0-9_-]{8,}\b/gi, REDACTED)
+    .replace(/\b(?:api[-_ ]?key|token|secret|password)\s*[=:]\s*[^\s,;)]+/gi, (match) => {
+      const separator = match.match(/\s*[=:]\s*/)?.[0] ?? "="
+      return `${match.slice(0, match.indexOf(separator))}${separator}${REDACTED}`
+    })
+}
+
+export function redactEndpoint(value: string): string {
+  return redactUrl(value)
+}
+
+function formatTimestamp(timestamp: number | undefined): string {
+  return timestamp === undefined ? "never" : new Date(timestamp).toISOString()
+}
+
+export function formatCommandCodeStatus(status: CommandCodeRuntimeStatus): string {
+  const lines = [
+    `source: ${status.source}`,
+    `model count: ${status.modelCount}`,
+    `last success: ${formatTimestamp(status.lastSuccess)}`,
+    `last attempt: ${formatTimestamp(status.lastAttempt)}`,
+    `cache path: ${status.cachePath}`,
+    `endpoint: ${redactEndpoint(status.endpoint)}`,
+    `refresh: ${status.refreshing ? "in progress" : "idle"}`,
+  ]
+
+  lines.push(`warning: ${status.warning ? redactDiagnosticText(status.warning) : "none"}`)
+  return lines.join("\n")
+}
+
+export class CommandCodeRuntime<TProviderConfig, TContext extends CommandCodeCommandContext> {
+  private readonly now: () => number
+  private readonly logWarning: (message: string) => void
+  private status: CommandCodeRuntimeStatus
+  private providerRegistered = false
+  private refreshPromise: Promise<CommandCodeRefreshResult> | undefined
+
+  constructor(
+    private readonly pi: CommandCodeRuntimeApi<TProviderConfig, TContext>,
+    private readonly options: CommandCodeRuntimeOptions<TProviderConfig>,
+  ) {
+    this.now = options.now ?? Date.now
+    this.logWarning = options.logWarning ?? ((message) => console.warn(`[commandcode] ${message}`))
+    const initialStatus: CommandCodeRuntimeStatus = {
+      source: "empty",
+      modelCount: 0,
+      cachePath: options.cachePath,
+      endpoint: options.endpoint,
+      refreshing: false,
+    }
+    this.status = { ...initialStatus }
+  }
+
+  getStatus(): CommandCodeRuntimeStatus {
+    return { ...this.status }
+  }
+
+  async initialize(): Promise<void> {
+    this.registerCommands()
+    await this.refresh()
+  }
+
+  refresh(): Promise<CommandCodeRefreshResult> {
+    if (this.refreshPromise) return this.refreshPromise
+
+    const refreshPromise = this.refreshCatalog().finally(() => {
+      if (this.refreshPromise === refreshPromise) this.refreshPromise = undefined
+    })
+    this.refreshPromise = refreshPromise
+    return refreshPromise
+  }
+
+  private async refreshCatalog(): Promise<CommandCodeRefreshResult> {
+    this.status = {
+      ...this.status,
+      lastAttempt: this.now(),
+      refreshing: true,
+    }
+
+    try {
+      const loaded = await this.options.loadModels()
+      const warning = loaded.warning ? redactDiagnosticText(loaded.warning) : undefined
+
+      const shouldRegister =
+        !this.providerRegistered ||
+        loaded.source === "live" ||
+        (this.status.modelCount === 0 && loaded.models.length > 0)
+
+      if (shouldRegister) {
+        this.pi.registerProvider("commandcode", this.options.createProviderConfig(loaded.models))
+        this.providerRegistered = true
+
+        if (loaded.models.length === 0) {
+          const preservedWarning = warning ?? "Model catalog refresh returned no models"
+          this.status = {
+            ...this.status,
+            source: loaded.source,
+            modelCount: 0,
+            warning: preservedWarning,
+            refreshing: false,
+          }
+          this.warn(preservedWarning)
+          return {
+            refreshed: false,
+            source: loaded.source,
+            modelCount: 0,
+            warning: preservedWarning,
+          }
+        }
+
+        this.status = {
+          ...this.status,
+          source: loaded.source,
+          modelCount: loaded.models.length,
+          lastSuccess: this.now(),
+          warning,
+          refreshing: false,
+        }
+        if (warning) this.warn(warning)
+        return {
+          refreshed: true,
+          source: loaded.source,
+          modelCount: loaded.models.length,
+          warning,
+        }
+      }
+
+      const preservedWarning = warning ?? "Model catalog refresh returned no models"
+      this.status = {
+        ...this.status,
+        warning: preservedWarning,
+        refreshing: false,
+      }
+      this.warn(preservedWarning)
+      return {
+        refreshed: false,
+        source: this.status.source,
+        modelCount: this.status.modelCount,
+        warning: preservedWarning,
+      }
+    } catch (error) {
+      const warning = redactDiagnosticText(
+        `Could not refresh the Command Code model catalog: ${errorMessage(error)}`,
+      )
+      this.status = {
+        ...this.status,
+        warning,
+        refreshing: false,
+      }
+      this.warn(warning)
+      return {
+        refreshed: false,
+        source: this.status.source,
+        modelCount: this.status.modelCount,
+        warning,
+      }
+    }
+  }
+
+  private warn(message: string): void {
+    try {
+      this.logWarning(redactDiagnosticText(message))
+    } catch {
+      // Diagnostics must never make a catalog refresh fail.
+    }
+  }
+
+  private registerCommands(): void {
+    this.pi.registerCommand("commandcode-refresh", {
+      description: "Refresh the Command Code model catalog",
+      handler: async (_args, ctx) => {
+        await ctx.waitForIdle?.()
+        const result = await this.refresh()
+        if (result.refreshed) {
+          ctx.ui.notify(
+            `Command Code model catalog refreshed (${result.modelCount} models from ${result.source}).`,
+            "info",
+          )
+        } else {
+          ctx.ui.notify(
+            `Command Code model catalog unchanged (${result.modelCount} models remain available).${result.warning ? ` ${result.warning}` : ""}`,
+            "warning",
+          )
+        }
+      },
+    })
+
+    this.pi.registerCommand("commandcode-status", {
+      description: "Show redacted Command Code provider diagnostics",
+      handler: async (_args, ctx) => {
+        ctx.ui.notify(
+          formatCommandCodeStatus(this.status),
+          this.status.warning ? "warning" : "info",
+        )
+      },
+    })
+  }
+}
+
+export function createCommandCodeRuntime<
+  TProviderConfig,
+  TContext extends CommandCodeCommandContext,
+>(
+  pi: CommandCodeRuntimeApi<TProviderConfig, TContext>,
+  options: CommandCodeRuntimeOptions<TProviderConfig>,
+): CommandCodeRuntime<TProviderConfig, TContext> {
+  return new CommandCodeRuntime(pi, options)
+}

src/types.ts

@@ -72,6 +72,13 @@ export interface ModelLike {
   provider: string
   maxTokens: number
   cost: ModelCost
+  reasoning?: boolean
+  thinkingLevelMap?: Partial<Record<string, string | null>>
+  thinking?: {
+    mode?: "effort"
+    effortMap?: Partial<Record<string, string>>
+    efforts?: readonly string[]
+  }
 }
 
 export interface MessageLike {
@@ -104,6 +111,8 @@ export interface StreamOptions {
   signal?: AbortSignal
   headers?: Record<string, string>
   maxTokens?: number
+  /** Resolved pi thinking level; forwarded only through the model's map. */
+  reasoning?: string
   onPayload?: (payload: unknown, model: ModelLike) => unknown | Promise<unknown>
   onResponse?: (response: ProviderResponseInfo, model: ModelLike) => void | Promise<void>
   /**

tests/test-models.ts

@@ -7,7 +7,12 @@ import { describe, it } from "node:test"
 import {
   commandCodeModelsFromApiResponse,
   commandCodeModelsFromCache,
+  DEFAULT_MODELS_TIMEOUT_MS,
+  getModelsTimeoutMs,
   loadCommandCodeModels,
+  MODEL_EFFORTS,
+  thinkingLevelMapForEfforts,
+  thinkingMetadataForModel,
   type CommandCodeModel,
 } from "../src/models.ts"
 
@@ -29,7 +34,7 @@ const EXPECTED_MODELS: readonly CommandCodeModel[] = [
   {
     id: "Qwen/Qwen3.7-Max",
     name: "Qwen 3.7 Max (CC)",
-    reasoning: true,
+    reasoning: false,
     contextWindow: 1_000_000,
     maxTokens: 65_536,
   },
@@ -49,6 +54,17 @@ function failingFetch(message = "offline"): typeof fetch {
   return () => Promise.reject(new TypeError(message))
 }
 
+function hangingFetch(): typeof fetch {
+  return (_input, init) =>
+    new Promise<Response>((_resolve, reject) => {
+      init?.signal?.addEventListener(
+        "abort",
+        () => reject(init.signal?.reason ?? new DOMException("Aborted", "AbortError")),
+        { once: true },
+      )
+    })
+}
+
 async function withTemporaryCache(
   run: (paths: { directory: string; cachePath: string }) => Promise<void>,
 ): Promise<void> {
@@ -65,6 +81,79 @@ describe("commandCodeModelsFromApiResponse()", () => {
     assert.deepEqual(commandCodeModelsFromApiResponse(API_RESPONSE), EXPECTED_MODELS)
   })
 
+  it("marks only known reasoning models as reasoning-capable", () => {
+    const models = commandCodeModelsFromApiResponse({
+      object: "list",
+      data: [
+        { ...API_RESPONSE.data[0], id: "deepseek/deepseek-v4-flash" },
+        { ...API_RESPONSE.data[0], id: "new-model-without-metadata" },
+      ],
+    })
+
+    assert.equal(models[0]?.reasoning, true)
+    assert.equal(models[1]?.reasoning, false)
+  })
+
+  it("matches the exact command-code@1.14.1 reasoning effort catalog", () => {
+    assert.deepEqual(MODEL_EFFORTS, {
+      "Qwen/Qwen3.8-Max": ["low", "medium", "xhigh"],
+      "claude-fable-5": ["low", "medium", "high", "xhigh", "max"],
+      "claude-opus-4-7": ["low", "medium", "high", "xhigh", "max"],
+      "claude-opus-4-8": ["low", "medium", "high", "xhigh", "max"],
+      "claude-opus-5": ["low", "medium", "high", "xhigh", "max"],
+      "claude-sonnet-4-6": ["low", "medium", "high", "xhigh", "max"],
+      "claude-sonnet-5": ["low", "medium", "high", "xhigh", "max"],
+      "deepseek/deepseek-v4-flash": ["high", "max"],
+      "deepseek/deepseek-v4-pro": ["high", "max"],
+      "gpt-5.3-codex": ["low", "medium", "high", "xhigh"],
+      "gpt-5.4": ["low", "medium", "high", "xhigh"],
+      "gpt-5.4-mini": ["low", "medium", "high"],
+      "gpt-5.5": ["low", "medium", "high", "xhigh"],
+      "gpt-5.6-luna": ["low", "medium", "high", "xhigh", "max"],
+      "gpt-5.6-sol": ["low", "medium", "high", "xhigh", "max"],
+      "gpt-5.6-terra": ["low", "medium", "high", "xhigh", "max"],
+      "google/gemini-3.1-flash-lite": ["low", "medium", "high"],
+      "google/gemini-3.5-flash": ["low", "medium", "high"],
+      "google/gemini-3.5-flash-lite": ["low", "medium", "high"],
+      "google/gemini-3.6-flash": ["low", "medium", "high"],
+      "sakana/fugu-ultra": ["high", "xhigh"],
+      "xai/grok-4.5": ["low", "medium", "high"],
+      "zai-org/GLM-5.2": ["high", "max"],
+    })
+  })
+
+  it("builds separate canonical pi and OMP metadata", () => {
+    for (const [modelId, efforts] of Object.entries(MODEL_EFFORTS)) {
+      const metadata = thinkingMetadataForModel(modelId)
+      assert.ok(metadata, `${modelId} should have reasoning metadata`)
+      assert.equal(metadata.thinking.mode, "effort")
+      assert.deepEqual(metadata.thinking.efforts, efforts)
+      assert.deepEqual(
+        metadata.thinking.effortMap,
+        Object.fromEntries(efforts.map((effort) => [effort, effort])),
+      )
+      assert.equal("defaultLevel" in metadata.thinking, false)
+      for (const level of ["minimal", "low", "medium", "high", "xhigh", "max"] as const) {
+        const expected = efforts.includes(level)
+        assert.equal(
+          metadata.thinkingLevelMap[level],
+          expected ? level : null,
+          `${modelId} should map ${level} according to its catalog entry`,
+        )
+      }
+    }
+
+    assert.deepEqual(thinkingLevelMapForEfforts(MODEL_EFFORTS["deepseek/deepseek-v4-flash"]), {
+      minimal: null,
+      low: null,
+      medium: null,
+      high: "high",
+      xhigh: null,
+      max: "max",
+    })
+    assert.deepEqual(thinkingMetadataForModel("new-model-without-metadata"), undefined)
+  })
+
   it("rejects unexpected API shapes", () => {
     assert.throws(() => commandCodeModelsFromApiResponse({ object: "list", data: [{}] }))
   })
@@ -78,6 +167,20 @@ describe("commandCodeModelsFromCache()", () => {
     )
   })
 
+  it("normalizes cached reasoning metadata from the model id", () => {
+    const cached = commandCodeModelsFromCache({
+      version: 1,
+      models: [
+        {
+          ...EXPECTED_MODELS[0],
+          id: "deepseek/deepseek-v4-flash",
+          reasoning: false,
+        },
+      ],
+    })
+    assert.equal(cached[0]?.reasoning, true)
+  })
+
   it("rejects empty, invalid, and unsupported caches", () => {
     assert.throws(() => commandCodeModelsFromCache({ version: 1, models: [] }))
     assert.throws(() => commandCodeModelsFromCache({ version: 2, models: EXPECTED_MODELS }))
@@ -90,7 +193,58 @@ describe("commandCodeModelsFromCache()", () => {
   })
 })
 
+describe("model discovery configuration", () => {
+  it("uses a safe default timeout and ignores invalid environment values", () => {
+    assert.equal(getModelsTimeoutMs({}), DEFAULT_MODELS_TIMEOUT_MS)
+    assert.equal(
+      getModelsTimeoutMs({ COMMANDCODE_MODELS_TIMEOUT_MS: "0" }),
+      DEFAULT_MODELS_TIMEOUT_MS,
+    )
+    assert.equal(
+      getModelsTimeoutMs({ COMMANDCODE_MODELS_TIMEOUT_MS: "invalid" }),
+      DEFAULT_MODELS_TIMEOUT_MS,
+    )
+    assert.equal(getModelsTimeoutMs({ COMMANDCODE_MODELS_TIMEOUT_MS: "25" }), 25)
+  })
+})
+
 describe("loadCommandCodeModels()", () => {
+  it("falls back to cache when live discovery times out", async () => {
+    await withTemporaryCache(async ({ cachePath }) => {
+      await loadCommandCodeModels({ cachePath, fetchImpl: successfulFetch() })
+
+      const startedAt = Date.now()
+      const result = await loadCommandCodeModels({
+        cachePath,
+        fetchImpl: hangingFetch(),
+        timeoutMs: 25,
+      })
+
+      assert.ok(Date.now() - startedAt < 500)
+      assert.deepEqual(result.models, EXPECTED_MODELS)
+      assert.equal(result.source, "cache")
+      assert.match(result.warning ?? "", /timed out after 25ms/)
+      assert.match(result.warning ?? "", /Using the cached catalog/)
+    })
+  })
+
+  it("preserves an external abort instead of falling back to cache", async () => {
+    await withTemporaryCache(async ({ cachePath }) => {
+      await loadCommandCodeModels({ cachePath, fetchImpl: successfulFetch() })
+      const controller = new AbortController()
+      const promise = loadCommandCodeModels({
+        cachePath,
+        fetchImpl: hangingFetch(),
+        timeoutMs: 1_000,
+        signal: controller.signal,
+      })
+
+      controller.abort(new Error("caller cancelled discovery"))
+
+      await assert.rejects(promise, /caller cancelled discovery/)
+    })
+  })
+
   it("returns live models and writes a validated cache", async () => {
     await withTemporaryCache(async ({ cachePath }) => {
       const result = await loadCommandCodeModels({
@@ -132,7 +286,7 @@ describe("loadCommandCodeModels()", () => {
       assert.deepEqual(result.models, [])
       assert.equal(result.source, "empty")
       assert.match(result.warning ?? "", /no valid cached catalog/)
-      assert.match(result.warning ?? "", /until \/reload succeeds/)
+      assert.match(result.warning ?? "", /until \/commandcode-refresh succeeds/)
     })
   })
 

tests/test-pi-local.mjs

@@ -277,9 +277,12 @@ try {
   )
   assert.equal(firstOfflineList.code, 0, firstOfflineList.stderr)
   assert.doesNotMatch(firstOfflineList.stderr, /Failed to load extension/)
-  assert.match(firstOfflineList.stdout || firstOfflineList.stderr, /No models matching/)
+  assert.match(
+    firstOfflineList.stdout || firstOfflineList.stderr,
+    /No models matching|No models available/,
+  )
   assert.match(firstOfflineList.stderr, /no valid cached catalog/)
-  assert.match(firstOfflineList.stderr, /until \/reload succeeds/)
+  assert.match(firstOfflineList.stderr, /until \/commandcode-refresh succeeds/)
   assert.throws(() => accessSync(modelsCachePath, constants.R_OK), /ENOENT|no such file/i)
 
   // A fresh process re-runs the extension entrypoint, which is the same path /reload uses.

tests/test-runtime.ts

@@ -0,0 +1,293 @@
+import assert from "node:assert/strict"
+import { describe, it } from "node:test"
+
+import {
+  createCommandCodeRuntime,
+  type CommandCodeCommandContext,
+  type CommandCodeRuntimeApi,
+} from "../src/runtime.ts"
+import type { CommandCodeModel, LoadCommandCodeModelsResult } from "../src/models.ts"
+
+type ProviderConfig = {
+  models: readonly CommandCodeModel[]
+}
+
+class ExtensionAPITestDouble implements CommandCodeRuntimeApi<ProviderConfig, CommandContext> {
+  readonly providers: ProviderConfig[] = []
+  readonly commands = new Map<string, (args: string, ctx: CommandContext) => Promise<void> | void>()
+
+  registerProvider(_name: string, config: ProviderConfig): void {
+    this.providers.push(config)
+  }
+
+  registerCommand(
+    name: string,
+    options: {
+      description: string
+      handler: (args: string, ctx: CommandContext) => Promise<void> | void
+    },
+  ): void {
+    this.commands.set(name, options.handler)
+  }
+}
+
+class CommandContext implements CommandCodeCommandContext {
+  readonly notifications: Array<{ message: string; type?: "info" | "warning" | "error" }> = []
+  waitForIdleCalls = 0
+
+  readonly ui = {
+    notify: (message: string, type?: "info" | "warning" | "error") => {
+      this.notifications.push({ message, type })
+    },
+  }
+
+  async waitForIdle(): Promise<void> {
+    this.waitForIdleCalls += 1
+  }
+}
+
+const FIRST_MODEL: CommandCodeModel = {
+  id: "first-model",
+  name: "First Model",
+  reasoning: true,
+  contextWindow: 128_000,
+  maxTokens: 16_384,
+}
+
+const SECOND_MODEL: CommandCodeModel = {
+  id: "second-model",
+  name: "Second Model",
+  reasoning: true,
+  contextWindow: 256_000,
+  maxTokens: 32_768,
+}
+
+function loaded(
+  models: readonly CommandCodeModel[],
+  source: LoadCommandCodeModelsResult["source"] = "live",
+  warning?: string,
+): LoadCommandCodeModelsResult {
+  return warning ? { models, source, warning } : { models, source }
+}
+
+function deferred<T>(): {
+  promise: Promise<T>
+  resolve(value: T): void
+  reject(error: unknown): void
+} {
+  let resolvePromise: (value: T) => void = () => {}
+  let rejectPromise: (error: unknown) => void = () => {}
+  const promise = new Promise<T>((resolve, reject) => {
+    resolvePromise = resolve
+    rejectPromise = reject
+  })
+  return { promise, resolve: resolvePromise, reject: rejectPromise }
+}
+
+describe("Command Code runtime", () => {
+  it("registers refresh and status commands and exposes redacted state", async () => {
+    const pi = new ExtensionAPITestDouble()
+    const context = new CommandContext()
+    let now = 1_700_000_000_000
+    const firstLoad = deferred<LoadCommandCodeModelsResult>()
+
+    const runtime = createCommandCodeRuntime(pi, {
+      endpoint: "https://api.commandcode.ai/provider/v1/models?token=user_secret_value",
+      cachePath: "/tmp/commandcode-models.json",
+      loadModels: () => firstLoad.promise,
+      createProviderConfig: (models) => ({ models }),
+      now: () => now,
+      logWarning: () => {},
+    })
+
+    const initialization = runtime.initialize()
+    assert.deepEqual([...pi.commands.keys()], ["commandcode-refresh", "commandcode-status"])
+    assert.equal(runtime.getStatus().refreshing, true)
+    assert.equal(runtime.getStatus().lastAttempt, now)
+
+    firstLoad.resolve(loaded([FIRST_MODEL]))
+    await initialization
+    now += 1_000
+
+    const statusCommand = pi.commands.get("commandcode-status")
+    assert.ok(statusCommand)
+    await statusCommand("", context)
+    const statusMessage = context.notifications.at(-1)?.message ?? ""
+    assert.match(statusMessage, /source: live/)
+    assert.match(statusMessage, /model count: 1/)
+    assert.match(statusMessage, /last success:/)
+    assert.match(statusMessage, /last attempt:/)
+    assert.match(statusMessage, /cache path: \/tmp\/commandcode-models\.json/)
+    assert.match(statusMessage, /endpoint: https:\/\/api\.commandcode\.ai\/provider\/v1\/models/)
+    assert.doesNotMatch(statusMessage, /token=user_secret_value/)
+    assert.doesNotMatch(statusMessage, /user_secret_value/)
+  })
+
+  it("coalesces overlapping refreshes and preserves the current catalog on failure", async () => {
+    const pi = new ExtensionAPITestDouble()
+    const warnings: string[] = []
+    const loads = [Promise.resolve(loaded([FIRST_MODEL])), deferred<LoadCommandCodeModelsResult>()]
+    let loadCount = 0
+
+    const runtime = createCommandCodeRuntime(pi, {
+      endpoint: "https://api.commandcode.ai/provider/v1/models",
+      cachePath: "/tmp/commandcode-models.json",
+      loadModels: () => {
+        const next = loads[loadCount]
+        loadCount += 1
+        if (!next) throw new Error("unexpected refresh")
+        return next instanceof Promise ? next : next.promise
+      },
+      createProviderConfig: (models) => ({ models }),
+      logWarning: (warning) => warnings.push(warning),
+    })
+
+    await runtime.initialize()
+    assert.equal(pi.providers.length, 1)
+    assert.deepEqual(pi.providers[0]?.models, [FIRST_MODEL])
+
+    const pending = loads[1]
+    assert.ok(!(pending instanceof Promise))
+    const firstRefresh = runtime.refresh()
+    const secondRefresh = runtime.refresh()
+    assert.strictEqual(firstRefresh, secondRefresh)
+    assert.equal(runtime.getStatus().refreshing, true)
+
+    pending.reject(new Error("request failed with apiKey=user_secret_value"))
+    const result = await firstRefresh
+
+    assert.equal(result.refreshed, false)
+    assert.equal(result.modelCount, 1)
+    assert.equal(runtime.getStatus().modelCount, 1)
+    assert.equal(runtime.getStatus().source, "live")
+    assert.equal(pi.providers.length, 1)
+    assert.equal(runtime.getStatus().refreshing, false)
+    assert.match(runtime.getStatus().warning ?? "", /Could not refresh/)
+    assert.doesNotMatch(runtime.getStatus().warning ?? "", /user_secret_value/)
+    assert.doesNotMatch(warnings.join("\n"), /user_secret_value/)
+  })
+
+  it("runs the refresh command and reports the updated catalog", async () => {
+    const pi = new ExtensionAPITestDouble()
+    const context = new CommandContext()
+    const results = [
+      Promise.resolve(loaded([FIRST_MODEL])),
+      Promise.resolve(loaded([FIRST_MODEL, SECOND_MODEL])),
+    ]
+    let index = 0
+
+    const runtime = createCommandCodeRuntime(pi, {
+      endpoint: "https://api.commandcode.ai/provider/v1/models",
+      cachePath: "/tmp/commandcode-models.json",
+      loadModels: () => {
+        const result = results[index]
+        index += 1
+        if (!result) throw new Error("unexpected refresh")
+        return result
+      },
+      createProviderConfig: (models) => ({ models }),
+      logWarning: () => {},
+    })
+
+    await runtime.initialize()
+    const refreshCommand = pi.commands.get("commandcode-refresh")
+    assert.ok(refreshCommand)
+    await refreshCommand("", context)
+
+    assert.equal(context.waitForIdleCalls, 1)
+    assert.equal(context.notifications.at(-1)?.type, "info")
+    assert.match(context.notifications.at(-1)?.message ?? "", /2 models from live/)
+    assert.deepEqual(pi.providers.at(-1)?.models, [FIRST_MODEL, SECOND_MODEL])
+  })
+
+  it("installs a cached catalog after an initially empty start", async () => {
+    const pi = new ExtensionAPITestDouble()
+    const results = [
+      Promise.resolve(loaded([], "empty", "offline")),
+      Promise.resolve(loaded([SECOND_MODEL], "cache")),
+    ]
+    let index = 0
+
+    const runtime = createCommandCodeRuntime(pi, {
+      endpoint: "https://api.commandcode.ai/provider/v1/models",
+      cachePath: "/tmp/commandcode-models.json",
+      loadModels: () => {
+        const result = results[index]
+        index += 1
+        if (!result) throw new Error("unexpected refresh")
+        return result
+      },
+      createProviderConfig: (models) => ({ models }),
+      logWarning: () => {},
+    })
+
+    await runtime.initialize()
+    assert.equal(pi.providers.length, 1)
+    assert.deepEqual(pi.providers[0]?.models, [])
+
+    const result = await runtime.refresh()
+    assert.equal(result.refreshed, true)
+    assert.equal(result.source, "cache")
+    assert.deepEqual(pi.providers.at(-1)?.models, [SECOND_MODEL])
+    assert.equal(runtime.getStatus().modelCount, 1)
+  })
+
+  it("does not replace an existing provider with an empty failed catalog", async () => {
+    const pi = new ExtensionAPITestDouble()
+    const results = [
+      Promise.resolve(loaded([FIRST_MODEL])),
+      Promise.resolve(loaded([], "cache", "No valid catalog is available at /private/cache")),
+      Promise.resolve(loaded([SECOND_MODEL])),
+    ]
+    let index = 0
+
+    const runtime = createCommandCodeRuntime(pi, {
+      endpoint: "http://127.0.0.1:1234/provider/v1/models",
+      cachePath: "/private/cache",
+      loadModels: () => {
+        const result = results[index]
+        index += 1
+        if (!result) throw new Error("unexpected refresh")
+        return result
+      },
+      createProviderConfig: (models) => ({ models }),
+      logWarning: () => {},
+    })
+
+    await runtime.initialize()
+    const refreshResult = await runtime.refresh()
+    assert.equal(refreshResult.refreshed, false)
+    assert.equal(pi.providers.length, 1)
+    assert.deepEqual(pi.providers[0]?.models, [FIRST_MODEL])
+    assert.equal(runtime.getStatus().modelCount, 1)
+    assert.equal(runtime.getStatus().source, "live")
+
+    await runtime.refresh()
+    assert.equal(pi.providers.length, 2)
+    assert.deepEqual(pi.providers[1]?.models, [SECOND_MODEL])
+  })
+
+  it("reports a failed initial refresh without leaking diagnostics", async () => {
+    const pi = new ExtensionAPITestDouble()
+    const context = new CommandContext()
+    const runtime = createCommandCodeRuntime(pi, {
+      endpoint: "https://api.commandcode.ai/provider/v1/models?api_key=user_initial_secret",
+      cachePath: "/tmp/commandcode-models.json",
+      loadModels: async () => {
+        throw new Error("offline; api_key=user_initial_secret")
+      },
+      createProviderConfig: (models) => ({ models }),
+      logWarning: () => {},
+    })
+
+    await runtime.initialize()
+    const statusCommand = pi.commands.get("commandcode-status")
+    assert.ok(statusCommand)
+    await statusCommand("", context)
+    const message = context.notifications.at(-1)?.message ?? ""
+    assert.match(message, /source: empty/)
+    assert.match(message, /model count: 0/)
+    assert.match(message, /warning:/)
+    assert.doesNotMatch(message, /user_initial_secret/)
+  })
+})

tests/test-stream.ts

@@ -7,6 +7,7 @@ import assert from "node:assert/strict"
 import { after, before, beforeEach, describe, it } from "node:test"
 
 import type { AssistantMessageEvent } from "../src/core.ts"
+import { MODEL_EFFORTS, thinkingLevelMapForEfforts } from "../src/models.ts"
 import {
   collectEvents,
   createTestDeps,
@@ -415,6 +416,84 @@ describe("streamCommandCode — request serialization", () => {
     assert.equal(headers["x-session-id"], undefined)
   })
 
+  it("accepts the legacy OMP nested reasoning map", async () => {
+    server.mockResponse({
+      type: "success",
+      events: [JSON.stringify({ type: "finish", finishReason: "stop" })],
+    })
+    const { streamCommandCode } = createTestDeps({ apiBase: server.baseUrl() })
+    const model = makeModel({
+      id: "omp-compat-reasoning-model",
+      reasoning: true,
+      thinking: { effortMap: { high: "legacy-high" } },
+    })
+
+    await collectEvents(
+      streamCommandCode(model, makeContext(), { apiKey: "mock-key", reasoning: "high" }),
+    )
+
+    assert.equal(objectAt(server.lastRequestBody(), ["params", "reasoning_effort"]), "legacy-high")
+  })
+
+  it("forwards a supported Pi reasoning level as reasoning_effort", async () => {
+    server.mockResponse({
+      type: "success",
+      events: [JSON.stringify({ type: "finish", finishReason: "stop" })],
+    })
+    const { streamCommandCode } = createTestDeps({ apiBase: server.baseUrl() })
+    const model = makeModel({
+      id: "deepseek/deepseek-v4-flash",
+      reasoning: true,
+      thinkingLevelMap: thinkingLevelMapForEfforts(MODEL_EFFORTS["deepseek/deepseek-v4-flash"]),
+    })
+
+    await collectEvents(
+      streamCommandCode(model, makeContext(), { apiKey: "mock-key", reasoning: "max" }),
+    )
+
+    assert.equal(objectAt(server.lastRequestBody(), ["params", "reasoning_effort"]), "max")
+  })
+
+  it("omits reasoning_effort for off, unsupported, and unknown reasoning levels", async () => {
+    const model = makeModel({
+      id: "deepseek/deepseek-v4-flash",
+      reasoning: true,
+      thinkingLevelMap: thinkingLevelMapForEfforts(MODEL_EFFORTS["deepseek/deepseek-v4-flash"]),
+    })
+
+    for (const reasoning of ["off", "low"] as const) {
+      server.mockResponse({
+        type: "success",
+        events: [JSON.stringify({ type: "finish", finishReason: "stop" })],
+      })
+      const { streamCommandCode } = createTestDeps({ apiBase: server.baseUrl() })
+
+      await collectEvents(
+        streamCommandCode(model, makeContext(), { apiKey: "mock-key", reasoning }),
+      )
+      assert.equal(
+        objectAt(server.lastRequestBody(), ["params", "reasoning_effort"]),
+        undefined,
+        `${reasoning} should not be sent when it has no supported Command Code field`,
+      )
+      server.reset()
+    }
+
+    server.mockResponse({
+      type: "success",
+      events: [JSON.stringify({ type: "finish", finishReason: "stop" })],
+    })
+    const { streamCommandCode } = createTestDeps({ apiBase: server.baseUrl() })
+    await collectEvents(
+      streamCommandCode(
+        makeModel({ id: "new-model-without-metadata", reasoning: false }),
+        makeContext(),
+        { apiKey: "mock-key", reasoning: "high" },
+      ),
+    )
+    assert.equal(objectAt(server.lastRequestBody(), ["params", "reasoning_effort"]), undefined)
+  })
+
   it("caps maxTokens and passes custom headers", async () => {
     server.mockResponse({
       type: "success",