diff --git a/src/lib/ai/reasoning/__tests__/dialect-cache.test.ts b/src/lib/ai/reasoning/__tests__/dialect-cache.test.ts
new file mode 100644
index 000000000..857a16cbf
--- /dev/null
+++ b/src/lib/ai/reasoning/__tests__/dialect-cache.test.ts
@@ -0,0 +1,52 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const annotations = vi.hoisted(
+  () => [] as Array<{ action?: unknown; meta?: Record<string, unknown> }>,
+);
+vi.mock("@/lib/logging/context", () => ({
+  annotate: (fields: { action?: unknown; meta?: Record<string, unknown> }) =>
+    annotations.push(fields),
+}));
+
+import {
+  annotateReasoningDowngrade,
+  learnedReasoningDialect,
+  rememberReasoningDialect,
+  resetReasoningDialectCache,
+} from "../dialect-cache";
+
+beforeEach(() => {
+  resetReasoningDialectCache();
+  annotations.length = 0;
+});
+
+describe("reasoning dialect cache", () => {
+  it("keys on provider, endpoint and model together", () => {
+    const key = { provider: "local", endpoint: "http://a/v1", model: "m1" };
+    rememberReasoningDialect(key, "none");
+    expect(learnedReasoningDialect(key)).toBe("none");
+    expect(learnedReasoningDialect({ ...key, model: "m2" })).toBeUndefined();
+    expect(
+      learnedReasoningDialect({ ...key, endpoint: "http://b/v1" }),
+    ).toBeUndefined();
+    expect(
+      learnedReasoningDialect({ ...key, provider: "openai" }),
+    ).toBeUndefined();
+    resetReasoningDialectCache();
+    expect(learnedReasoningDialect(key)).toBeUndefined();
+  });
+
+  it("marks a downgrade with meta keys only, never the action", () => {
+    annotateReasoningDowngrade("codex", "high", "medium");
+    expect(annotations).toEqual([
+      {
+        meta: {
+          ai_reasoning_downgraded: true,
+          ai_reasoning_downgraded_provider: "codex",
+          ai_reasoning_downgraded_from: "high",
+          ai_reasoning_downgraded_to: "medium",
+        },
+      },
+    ]);
+  });
+});
diff --git a/src/lib/ai/reasoning/__tests__/support.test.ts b/src/lib/ai/reasoning/__tests__/support.test.ts
new file mode 100644
index 000000000..3f2fc7dcb
--- /dev/null
+++ b/src/lib/ai/reasoning/__tests__/support.test.ts
@@ -0,0 +1,171 @@
+import { describe, expect, it } from "vitest";
+import {
+  anthropicModelVersion,
+  anthropicRefusesSampling,
+  anthropicThinkingDialect,
+  anthropicThinksAlways,
+  isOpenRouterEndpoint,
+  levelOfWireEffort,
+  openAIOffEffort,
+  openAIReasoningFamily,
+  reasoningSupport,
+  reasoningTitleOf,
+  splitThinkTags,
+} from "../support";
+
+describe("anthropicModelVersion", () => {
+  it.each([
+    ["claude-sonnet-4-6", { major: 4, minor: 6 }],
+    ["claude-opus-4-7", { major: 4, minor: 7 }],
+    ["claude-opus-5", { major: 5, minor: 0 }],
+    ["claude-opus-5-5", { major: 5, minor: 5 }],
+    ["claude-fable-5-1", { major: 5, minor: 1 }],
+    ["claude-haiku-4-5", { major: 4, minor: 5 }],
+    // An eight-digit segment is a snapshot date, not a minor.
+    ["claude-opus-4-20250514", { major: 4, minor: 0 }],
+    ["claude-opus-4-1-20250805", { major: 4, minor: 1 }],
+    ["claude-sonnet-4.5", { major: 4, minor: 5 }],
+    ["anthropic/claude-sonnet-4.6", { major: 4, minor: 6 }],
+    ["claude-3-7-sonnet-latest", { major: 3, minor: 7 }],
+    ["claude-3-5-sonnet-latest", { major: 3, minor: 5 }],
+  ])("%s", (model, expected) => {
+    expect(anthropicModelVersion(model)).toEqual(expected);
+  });
+
+  it("returns null for a name it cannot read", () => {
+    expect(anthropicModelVersion("my-claude-proxy")).toBeNull();
+  });
+});
+
+describe("anthropicThinkingDialect", () => {
+  it.each([
+    ["claude-3-5-sonnet-latest", "none"],
+    ["claude-3-7-sonnet-latest", "manual"],
+    ["claude-opus-4-20250514", "manual"],
+    ["claude-haiku-4-5", "manual"],
+    ["claude-sonnet-4-5", "manual"],
+    // budget_tokens is deprecated on 4.6 and refused from 4.7 on.
+    ["claude-sonnet-4-6", "adaptive"],
+    ["claude-opus-4-7", "adaptive"],
+    ["claude-opus-5", "adaptive"],
+    ["claude-sonnet-5", "adaptive"],
+    // Unknown names try the current form first and learn from a refusal.
+    ["my-claude-proxy", "adaptive"],
+  ])("%s → %s", (model, dialect) => {
+    expect(anthropicThinkingDialect(model)).toBe(dialect);
+  });
+
+  it("refuses sampling from 4.7 on, never for an unknown name", () => {
+    expect(anthropicRefusesSampling("claude-sonnet-4-6")).toBe(false);
+    expect(anthropicRefusesSampling("claude-opus-4-7")).toBe(true);
+    expect(anthropicRefusesSampling("claude-sonnet-5")).toBe(true);
+    expect(anthropicRefusesSampling("claude-opus-5-5")).toBe(true);
+    expect(anthropicRefusesSampling("my-claude-proxy")).toBe(false);
+  });
+
+  it("thinks always from the 5 generation on", () => {
+    expect(anthropicThinksAlways("claude-opus-4-8")).toBe(false);
+    expect(anthropicThinksAlways("claude-opus-5")).toBe(true);
+    expect(anthropicThinksAlways("claude-sonnet-5")).toBe(true);
+  });
+});
+
+describe("OpenAI families", () => {
+  it.each([
+    ["gpt-5.5", "gpt-5.1+", "none"],
+    ["gpt-5.1-mini", "gpt-5.1+", "none"],
+    ["gpt-5", "gpt-5", "minimal"],
+    ["gpt-5-mini", "gpt-5", "minimal"],
+    ["o3", "o", "low"],
+    ["o4-mini", "o", "low"],
+  ] as const)("%s", (model, family, off) => {
+    expect(openAIReasoningFamily(model)).toBe(family);
+    expect(openAIOffEffort(family)).toBe(off);
+  });
+
+  it("does not treat a non-reasoning model as one", () => {
+    expect(openAIReasoningFamily("gpt-4o")).toBeNull();
+    expect(openAIReasoningFamily("gpt-4.1-mini")).toBeNull();
+  });
+
+  it("recognises OpenRouter by host only", () => {
+    expect(isOpenRouterEndpoint("https://openrouter.ai/api/v1")).toBe(true);
+    expect(isOpenRouterEndpoint("https://eu.openrouter.ai/api/v1")).toBe(true);
+    expect(isOpenRouterEndpoint("https://openrouter.ai.evil.example/v1")).toBe(
+      false,
+    );
+    expect(isOpenRouterEndpoint("not a url")).toBe(false);
+  });
+});
+
+describe("reasoningSupport", () => {
+  it("reports the matrix per provider", () => {
+    expect(reasoningSupport("codex", "gpt-5.5")).toEqual({
+      effort: true,
+      summaries: true,
+      liveSummaries: true,
+      stateRoundTrip: true,
+      offIsReal: true,
+    });
+    expect(reasoningSupport("anthropic", "claude-opus-5").offIsReal).toBe(
+      false,
+    );
+    expect(reasoningSupport("anthropic", "claude-sonnet-4-6").offIsReal).toBe(
+      true,
+    );
+    expect(
+      reasoningSupport("anthropic", "claude-3-5-sonnet-latest").effort,
+    ).toBe(false);
+    expect(reasoningSupport("admin-key", "gpt-4o").effort).toBe(false);
+    expect(reasoningSupport("admin-key", "gpt-5").offIsReal).toBe(false);
+    expect(
+      reasoningSupport("openai-compatible", "x", {
+        baseUrl: "https://openrouter.ai/api/v1",
+      }).stateRoundTrip,
+    ).toBe(true);
+    expect(
+      reasoningSupport("openai-compatible", "x", {
+        baseUrl: "https://litellm.example.com/v1",
+      }).stateRoundTrip,
+    ).toBe(false);
+    expect(reasoningSupport("local", "qwen3").liveSummaries).toBe(true);
+    expect(reasoningSupport("none", "").effort).toBe(false);
+  });
+});
+
+describe("parsing helpers", () => {
+  it("reads a bold first line as the title, and nothing else", () => {
+    expect(reasoningTitleOf("**Checking the window**\n\nBody")).toBe(
+      "Checking the window",
+    );
+    expect(reasoningTitleOf("**Checking the window**")).toBe(
+      "Checking the window",
+    );
+    expect(reasoningTitleOf("**Checking the")).toBeNull();
+    expect(reasoningTitleOf("Plain first line\n**Later**")).toBeNull();
+  });
+
+  it("splits a leading think block and leaves later mentions alone", () => {
+    expect(splitThinkTags("<think>a plan</think>\n\nThe answer.")).toEqual({
+      content: "The answer.",
+      reasoning: "a plan",
+    });
+    expect(splitThinkTags("The answer mentions <think>.")).toEqual({
+      content: "The answer mentions <think>.",
+      reasoning: null,
+    });
+    // Unclosed: the budget ran out inside the reasoning.
+    expect(splitThinkTags("<think>still going")).toEqual({
+      content: "",
+      reasoning: "still going",
+    });
+  });
+
+  it("maps wire efforts back onto levels", () => {
+    expect(levelOfWireEffort("none")).toBe("off");
+    expect(levelOfWireEffort("minimal")).toBe("off");
+    expect(levelOfWireEffort("medium")).toBe("medium");
+    expect(levelOfWireEffort("xhigh")).toBe("high");
+    expect(levelOfWireEffort(null)).toBe("off");
+  });
+});
diff --git a/src/lib/ai/reasoning/dialect-cache.ts b/src/lib/ai/reasoning/dialect-cache.ts
new file mode 100644
index 000000000..c9024da09
--- /dev/null
+++ b/src/lib/ai/reasoning/dialect-cache.ts
@@ -0,0 +1,77 @@
+/**
+ * v1.41 — what an endpoint answered when it was asked to reason, learned at
+ * runtime and kept for the life of the process.
+ *
+ * Every client that sends reasoning parameters to a wire it does not control
+ * (a gateway, a local server, a model name the client has never seen, a Codex
+ * slug whose accepted efforts moved) asks this cache first. When the endpoint
+ * rejects a parameter the client retries once with the lesser request and
+ * records the lesser request here, so the next call does not pay the rejected
+ * round-trip again. A successful call never has to be recorded: the default
+ * is "send what was asked".
+ *
+ * Keyed by provider, endpoint and model, because the same gateway can serve a
+ * model that reasons and one that does not, and the same model name can sit
+ * behind two endpoints with different parameter rules. The values are short
+ * strings each client defines for itself; nothing outside the client reads
+ * them.
+ *
+ * Pattern borrowed from `../json-dialect.ts`, which learns the JSON-mode flag
+ * the same way. Server-only: the provider clients are its only importers.
+ */
+import { annotate } from "@/lib/logging/context";
+
+export interface ReasoningDialectKey {
+  /** The client that learned it (`codex`, `anthropic`, `openai`, `local`). */
+  provider: string;
+  /** Base URL or endpoint constant. */
+  endpoint: string;
+  model: string;
+}
+
+const learned = new Map<string, string>();
+
+function cacheKey(key: ReasoningDialectKey): string {
+  return `${key.provider}\u0000${key.endpoint}\u0000${key.model}`;
+}
+
+/** The learned dialect value for `key`, or `undefined` when nothing was learned. */
+export function learnedReasoningDialect(
+  key: ReasoningDialectKey,
+): string | undefined {
+  return learned.get(cacheKey(key));
+}
+
+/** Record what `key` accepts after it refused a richer request. */
+export function rememberReasoningDialect(
+  key: ReasoningDialectKey,
+  value: string,
+): void {
+  learned.set(cacheKey(key), value);
+}
+
+/** Test hook: forget everything learned. */
+export function resetReasoningDialectCache(): void {
+  learned.clear();
+}
+
+/**
+ * Mark the request's wide event with a reasoning downgrade. Meta keys only,
+ * never an action: the route or job owns the action name dashboards pin on.
+ * The values are our own vocabulary (provider tag, wire effort), never model
+ * or upstream text.
+ */
+export function annotateReasoningDowngrade(
+  provider: string,
+  from: string,
+  to: string,
+): void {
+  annotate({
+    meta: {
+      ai_reasoning_downgraded: true,
+      ai_reasoning_downgraded_provider: provider,
+      ai_reasoning_downgraded_from: from,
+      ai_reasoning_downgraded_to: to,
+    },
+  });
+}
diff --git a/src/lib/ai/reasoning/support.ts b/src/lib/ai/reasoning/support.ts
new file mode 100644
index 000000000..b1d6d0615
--- /dev/null
+++ b/src/lib/ai/reasoning/support.ts
@@ -0,0 +1,297 @@
+/**
+ * v1.41 — what each provider can do with reasoning, read from the provider
+ * type and the model name alone.
+ *
+ * No admin keeps a model list. A name this file does not recognise is treated
+ * optimistically: the client sends the request, and if the endpoint refuses a
+ * parameter it retries without it and learns the refusal per endpoint and
+ * model (`dialect-cache.ts`). What is reported here is therefore the starting
+ * assumption, not a promise; the settings use `offIsReal` to label the lowest
+ * option "Off" or "Minimal".
+ *
+ * The wire facts behind each branch, with sources:
+ *
+ *  - Codex backend: Responses API `reasoning: { effort, summary }` plus
+ *    `include: ["reasoning.encrypted_content"]` for the stateless round trip.
+ *    A live probe on 2026-10-06 against the current slug (`gpt-5.5`) answered
+ *    `effort: "none"` with a non-reasoning reply and rejected `minimal` with
+ *    "Supported values are: 'none', 'low', 'medium', 'high', and 'xhigh'",
+ *    so "off" is real there. https://developers.openai.com/api/docs/guides/reasoning,
+ *    https://developers.openai.com/cookbook/examples/responses_api/reasoning_items
+ *  - OpenAI Chat Completions: `reasoning_effort`, no summaries and no
+ *    reasoning items to hand back between tool rounds, so reasoning is only
+ *    sent on rounds without tools. `none` exists from gpt-5.1 on; gpt-5 knows
+ *    `minimal`; the o-series starts at `low`.
+ *    https://platform.openai.com/docs/api-reference/chat/create
+ *  - Anthropic: manual `thinking: { type: "enabled", budget_tokens }` up to
+ *    the 4.5 generation; adaptive `thinking: { type: "adaptive" }` with
+ *    `output_config.effort` from 4.6 on (`budget_tokens` is deprecated on 4.6
+ *    and refused from 4.7). From the 5 generation thinking is on whatever the
+ *    request says, so "off" becomes the lowest effort. Sampling parameters
+ *    are refused from 4.7 on.
+ *    https://platform.claude.com/docs/en/build-with-claude/extended-thinking,
+ *    https://platform.claude.com/docs/en/build-with-claude/adaptive-thinking,
+ *    https://platform.claude.com/docs/en/build-with-claude/effort
+ *  - OpenRouter: `reasoning: { effort }` with `none` and `minimal` accepted,
+ *    reply `reasoning` (text) and `reasoning_details[]`, which must go back
+ *    unmodified on the assistant message of a tool round.
+ *    https://openrouter.ai/docs/use-cases/reasoning-tokens
+ *  - Other OpenAI-compatible gateways and local servers: `reasoning_effort`,
+ *    reply `reasoning_content` (llama.cpp, LiteLLM) or `reasoning` (vLLM,
+ *    Ollama, LM Studio), some models inline `<think>…</think>`.
+ *    https://docs.litellm.ai/docs/reasoning_content,
+ *    https://docs.vllm.ai/en/latest/features/reasoning_outputs.html,
+ *    https://docs.ollama.com/api/openai-compatibility,
+ *    https://github.com/ggml-org/llama.cpp/blob/master/tools/server/README.md
+ *
+ * Client-safe: no server import.
+ */
+import type { ProviderType } from "../types";
+import type { ReasoningLevel } from "./levels";
+
+export interface ReasoningSupport {
+  /** The provider takes an effort (or a budget) at all. */
+  effort: boolean;
+  /** It returns readable summaries of the reasoning. */
+  summaries: boolean;
+  /** Summaries arrive while the call runs, not only after it. */
+  liveSummaries: boolean;
+  /** Reasoning state has to travel between tool rounds (`providerState`). */
+  stateRoundTrip: boolean;
+  /** "Off" switches reasoning off; false means it falls to the lowest level. */
+  offIsReal: boolean;
+}
+
+const NONE: ReasoningSupport = {
+  effort: false,
+  summaries: false,
+  liveSummaries: false,
+  stateRoundTrip: false,
+  offIsReal: true,
+};
+
+// ── Anthropic ───────────────────────────────────────────────────────────────
+
+export interface AnthropicModelVersion {
+  major: number;
+  minor: number;
+}
+
+/**
+ * The generation of a Claude model id: `claude-<tier>-<major>[-<minor>][-<date>]`
+ * from Claude 4 on (`claude-sonnet-4-6`, `claude-opus-5`, `claude-opus-4-20250514`),
+ * `claude-<major>[-<minor>]-<tier>` before (`claude-3-7-sonnet-latest`). A
+ * dotted minor (`claude-sonnet-4.5`, the gateway spelling) reads the same. An
+ * eight-digit segment is a snapshot date, not a minor. `null` for anything
+ * else (a proxy alias, a typo): the client then tries the current dialect and
+ * learns from the answer.
+ */
+export function anthropicModelVersion(
+  model: string,
+): AnthropicModelVersion | null {
+  const m = model.toLowerCase().replace(/^anthropic\//, "");
+  const modern =
+    /^claude-(?:opus|sonnet|haiku|fable|mythos)-(\d{1,2})(?:[-.](\d{1,2}))?(?:$|[-@:])/.exec(
+      m,
+    );
+  if (modern) {
+    return { major: Number(modern[1]), minor: Number(modern[2] ?? 0) };
+  }
+  const legacy = /^claude-(\d)(?:[-.](\d))?-(?:opus|sonnet|haiku)/.exec(m);
+  if (legacy) {
+    return { major: Number(legacy[1]), minor: Number(legacy[2] ?? 0) };
+  }
+  return null;
+}
+
+function atLeast(
+  v: AnthropicModelVersion,
+  major: number,
+  minor: number,
+): boolean {
+  return v.major > major || (v.major === major && v.minor >= minor);
+}
+
+/**
+ * How a Claude model is asked to think. `manual` is the budget form (up to
+ * 4.5, and 3.7), `adaptive` the effort form (4.6 on, and every name this
+ * function cannot read), `none` a model that cannot think (3.5 and older).
+ */
+export type AnthropicThinkingDialect = "adaptive" | "manual" | "none";
+
+export function anthropicThinkingDialect(
+  model: string,
+): AnthropicThinkingDialect {
+  const v = anthropicModelVersion(model);
+  if (!v) return "adaptive";
+  if (v.major < 3) return "none";
+  if (v.major === 3) return v.minor >= 7 ? "manual" : "none";
+  return atLeast(v, 4, 6) ? "adaptive" : "manual";
+}
+
+/**
+ * True when the model refuses `temperature` / `top_p` / `top_k` (4.7 on; the
+ * 5 generation refuses any value, including the default). Unknown names
+ * return false: the client keeps today's wire and learns from a refusal.
+ */
+export function anthropicRefusesSampling(model: string): boolean {
+  const v = anthropicModelVersion(model);
+  return v !== null && atLeast(v, 4, 7);
+}
+
+/** True from the 5 generation on: thinking runs whatever the request says. */
+export function anthropicThinksAlways(model: string): boolean {
+  const v = anthropicModelVersion(model);
+  return v !== null && v.major >= 5;
+}
+
+// ── OpenAI ──────────────────────────────────────────────────────────────────
+
+/**
+ * The reasoning family of an OpenAI model id, or `null` for a model that does
+ * not reason (`gpt-4o`, `gpt-4.1`). `gpt-5.1+` knows `none`, bare `gpt-5`
+ * (and its mini / nano) stops at `minimal`, the o-series at `low`.
+ */
+export type OpenAIReasoningFamily = "gpt-5.1+" | "gpt-5" | "o" | null;
+
+export function openAIReasoningFamily(model: string): OpenAIReasoningFamily {
+  const m = model.toLowerCase().replace(/^openai\//, "");
+  const gpt5 = /^gpt-5(?:\.(\d+))?(?:$|-)/.exec(m);
+  if (gpt5) return gpt5[1] && Number(gpt5[1]) >= 1 ? "gpt-5.1+" : "gpt-5";
+  if (/^o[134](?:$|-)/.test(m)) return "o";
+  return null;
+}
+
+/** The lowest `reasoning_effort` an OpenAI reasoning family accepts. */
+export function openAIOffEffort(
+  family: Exclude<OpenAIReasoningFamily, null>,
+): "none" | "minimal" | "low" {
+  return family === "gpt-5.1+"
+    ? "none"
+    : family === "gpt-5"
+      ? "minimal"
+      : "low";
+}
+
+/** True for an OpenRouter base URL, whose reasoning dialect differs. */
+export function isOpenRouterEndpoint(baseUrl: string): boolean {
+  try {
+    const host = new URL(baseUrl).hostname.toLowerCase();
+    return host === "openrouter.ai" || host.endsWith(".openrouter.ai");
+  } catch {
+    return false;
+  }
+}
+
+// ── Support matrix ──────────────────────────────────────────────────────────
+
+/**
+ * What `providerType` serving `model` can do with reasoning. `baseUrl` only
+ * matters for the gateway tag (OpenRouter has its own dialect) and the
+ * operator's OpenAI provider (a non-OpenAI base URL is a gateway in all but
+ * name).
+ */
+export function reasoningSupport(
+  providerType: ProviderType,
+  model: string,
+  opts: { baseUrl?: string } = {},
+): ReasoningSupport {
+  switch (providerType) {
+    case "codex":
+      return {
+        effort: true,
+        summaries: true,
+        liveSummaries: true,
+        stateRoundTrip: true,
+        offIsReal: true,
+      };
+    case "anthropic": {
+      const dialect = anthropicThinkingDialect(model);
+      if (dialect === "none") return NONE;
+      return {
+        effort: true,
+        summaries: true,
+        liveSummaries: false,
+        stateRoundTrip: true,
+        offIsReal: !anthropicThinksAlways(model),
+      };
+    }
+    case "admin-key": {
+      const family = openAIReasoningFamily(model);
+      if (!family) return NONE;
+      return {
+        effort: true,
+        summaries: false,
+        liveSummaries: false,
+        stateRoundTrip: false,
+        offIsReal: family === "gpt-5.1+",
+      };
+    }
+    case "openai-compatible": {
+      const openRouter = opts.baseUrl
+        ? isOpenRouterEndpoint(opts.baseUrl)
+        : false;
+      return {
+        effort: true,
+        summaries: true,
+        liveSummaries: false,
+        stateRoundTrip: openRouter,
+        offIsReal: true,
+      };
+    }
+    case "local":
+      return {
+        effort: true,
+        summaries: true,
+        liveSummaries: true,
+        stateRoundTrip: false,
+        offIsReal: true,
+      };
+    case "none":
+      return NONE;
+  }
+}
+
+// ── Shared parsing helpers ──────────────────────────────────────────────────
+
+/**
+ * The title of a reasoning summary: its first line when that line is wholly
+ * bold (`**Checking the window**`), the convention the Responses API
+ * summaries follow. `null` when the summary has no such line yet or at all.
+ */
+export function reasoningTitleOf(text: string): string | null {
+  const m = /^\s*\*\*([^*\n]+?)\*\*\s*(?:\n|$)/.exec(text);
+  return m ? m[1].trim() : null;
+}
+
+/**
+ * Split a reply that inlines its reasoning as a leading `<think>…</think>`
+ * block (some local models do). Only a block at the very start counts; a
+ * mention later in the prose stays prose. An unclosed block means the answer
+ * budget ran out inside the reasoning: everything is reasoning, no answer.
+ */
+export function splitThinkTags(content: string): {
+  content: string;
+  reasoning: string | null;
+} {
+  const m = /^\s*<think>([\s\S]*?)(<\/think>|$)/.exec(content);
+  if (!m) return { content, reasoning: null };
+  const reasoning = m[1].trim();
+  const rest = m[2] ? content.slice(m[0].length).replace(/^\s+/, "") : "";
+  return { content: rest, reasoning: reasoning.length > 0 ? reasoning : null };
+}
+
+/** The level a provider's wire effort corresponds to, for `downgradedTo`. */
+export function levelOfWireEffort(effort: string | null): ReasoningLevel {
+  switch (effort) {
+    case "low":
+    case "medium":
+    case "high":
+      return effort;
+    case "xhigh":
+    case "max":
+      return "high";
+    default:
+      return "off";
+  }
+}