swarm-ui: choose the review classifier's runtime on the settings page

The classifier settings page showed model and effort only, so the API-key
or ACP runtime could be switched only through a raw API call. It now has a
runtime select, and under ACP the provider's URL, model and prices. A PUT
carries the provider only on the ACP runtime, so the stored record stays
for a switch back. Closes #5249

docs/swarm/ui.md

@@ -118,17 +118,24 @@ filters in the browser. It shows no token counts, cache counts or cost.
 
 ### Classifier settings
 
-Under the try-out form, **classifier settings** shows the model and effort the
-[review classifier](review-classifier.md) runs with and how many requested
-reviews run at once, and lets you change them. The model is free text, one word
-as claude's `--model` takes it, such as `haiku` or `sonnet`. The effort is one
-of low, medium, high, xhigh and max, or claude's own default. Concurrent
-reviews is a whole number from 1 to 8; try-outs don't count toward it.
+Under the try-out form, **classifier settings** shows the runtime, model and
+effort the [review classifier](review-classifier.md) runs with and how many
+requested reviews run at once, and lets you change them. The runtime is **API
+key** (claude on the Anthropic key) or **ACP** (opencode on a provider). On the
+API key runtime the model is free text, one word as claude's `--model` takes
+it, such as `haiku` or `sonnet`. Choosing ACP shows the provider's fields in
+place of the model: its `https://` URL, its model name, and what it charges in
+USD per million tokens for input and output, with optional cache read and
+cache write prices. The effort is one of low, medium, high, xhigh and max, or
+the runtime's own default. Concurrent reviews is a whole number from 1 to 8;
+try-outs don't count toward it.
 
-**save** is on once something changed and the fields are valid. A save replaces
-all three settings. If the controller refuses it, the page shows the reason and
-leaves the form as you typed it. A change takes effect from the next run, with
-no restart. The page has no API key field: admins set the key in the bao UI.
+**save** is on once something changed and the fields are valid. A save changes
+the runtime, model, effort and limit, and the provider too while the runtime is
+ACP, so switching back to API key keeps the stored provider for next time. If
+the controller refuses it, the page shows the reason and leaves the form as you
+typed it. A change takes effect from the next run, with no restart. The page
+has no API key field: admins set each runtime's key in the bao UI.
 
 ### Scheduled prompts
 

frontend/packages/swarm-ui/src/pages/review-settings/ClassifierSettings.css

@@ -1,4 +1,5 @@
-/* The settings form: the three fields on one line, then the save action. */
+/* The settings form: the fields wrap in a row, the provider fields on a row of
+ * their own under the ACP runtime, then the save action. */
 .ui-classifier-settings {
   display: flex;
   flex-direction: column;

frontend/packages/swarm-ui/src/pages/review-settings/ClassifierSettings.tsx

@@ -1,9 +1,11 @@
-// <ClassifierSettings> — the review classifier's model, effort and how many
-// requested reviews run at once, shown and saved here
-// (`GET`/`PUT /api/review-classifier/settings`). A PUT replaces the stored
-// settings whole, so the form sends all three fields. A refused save shows the
-// route's own reason and leaves the form as typed. There is no API key field:
-// admins set the key in the bao UI.
+// <ClassifierSettings> — the review classifier's runtime, model, effort and
+// how many requested reviews run at once, shown and saved here
+// (`GET`/`PUT /api/review-classifier/settings`). A PUT changes only the
+// fields it carries: the form sends the runtime, model, effort and limit, and
+// the ACP provider only while the runtime is ACP, so the stored provider
+// survives a switch back. A refused save shows the route's own reason and
+// leaves the form as typed. There is no API key field: admins set each
+// runtime's key in the bao UI.
 import { useEffect, useState } from "preact/hooks";
 import { ApiErrorPanel } from "@hive/shared/api-error-panel.js";
 import { readApiError, type ProblemDetails } from "@hive/shared/api-error.js";
@@ -20,12 +22,18 @@ import {
   settingsProblem,
   toSettings,
   type ClassifierSettingsBody,
+  type Runtime,
   type SettingsDraft,
 } from "./SettingsTypes.js";
 import "./ClassifierSettings.css";
 
 const SETTINGS = "/api/review-classifier/settings";
 
+const RUNTIME_OPTIONS = [
+  { value: "api-key", label: "API key (claude)" },
+  { value: "acp", label: "ACP (opencode)" },
+];
+
 const EFFORT_OPTIONS = [
   { value: "", label: "claude's default" },
   ...EFFORTS.map((e) => ({ value: e, label: e })),
@@ -101,10 +109,12 @@ export function ClassifierSettings() {
   return (
     <Panel title="classifier settings" icon="⚙️">
       <p>
-        The model and effort the review classifier runs with, and how many
-        requested reviews run at once. A change takes effect from the next run,
-        with no restart. Try-outs don't count toward the limit. The API key is
-        set in the bao UI, not here.
+        The runtime, model and effort the review classifier runs with, and how
+        many requested reviews run at once. The API key runtime runs claude on
+        the Anthropic key; the ACP runtime runs opencode on the provider given
+        here. A change takes effect from the next run, with no restart. Try-outs
+        don't count toward the limit. Each runtime's key is set in the bao UI,
+        not here.
       </p>
       {loadError ? (
         <ApiErrorPanel
@@ -115,13 +125,24 @@ export function ClassifierSettings() {
       {draft ? (
         <form class="ui-classifier-settings" onSubmit={(e) => void save(e)}>
           <div class="ui-classifier-settings-fields">
-            <TextField
-              id="classifier-model"
-              label="model"
-              value={draft.model}
-              placeholder="haiku"
-              onInput={(model) => edit({ ...draft, model })}
+            <SelectField
+              id="classifier-runtime"
+              label="runtime"
+              value={draft.runtime}
+              options={RUNTIME_OPTIONS}
+              onChange={(runtime) =>
+                edit({ ...draft, runtime: runtime as Runtime })
+              }
             />
+            {draft.runtime === "api-key" ? (
+              <TextField
+                id="classifier-model"
+                label="model"
+                value={draft.model}
+                placeholder="haiku"
+                onInput={(model) => edit({ ...draft, model })}
+              />
+            ) : null}
             <SelectField
               id="classifier-effort"
               label="effort"
@@ -137,6 +158,50 @@ export function ClassifierSettings() {
               onInput={(max) => edit({ ...draft, max })}
             />
           </div>
+          {draft.runtime === "acp" ? (
+            <div class="ui-classifier-settings-fields">
+              <TextField
+                id="classifier-acp-url"
+                label="provider URL"
+                value={draft.acpUrl}
+                placeholder="https://llm.example/v1"
+                onInput={(acpUrl) => edit({ ...draft, acpUrl })}
+              />
+              <TextField
+                id="classifier-acp-model"
+                label="provider model"
+                value={draft.acpModel}
+                placeholder="Qwen/Qwen3-35B"
+                onInput={(acpModel) => edit({ ...draft, acpModel })}
+              />
+              <TextField
+                id="classifier-acp-price-input"
+                label="input price (USD per million tokens)"
+                value={draft.priceInput}
+                onInput={(priceInput) => edit({ ...draft, priceInput })}
+              />
+              <TextField
+                id="classifier-acp-price-output"
+                label="output price (USD per million tokens)"
+                value={draft.priceOutput}
+                onInput={(priceOutput) => edit({ ...draft, priceOutput })}
+              />
+              <TextField
+                id="classifier-acp-price-cache-read"
+                label="cache read price (optional)"
+                value={draft.priceCacheRead}
+                onInput={(priceCacheRead) => edit({ ...draft, priceCacheRead })}
+              />
+              <TextField
+                id="classifier-acp-price-cache-write"
+                label="cache write price (optional)"
+                value={draft.priceCacheWrite}
+                onInput={(priceCacheWrite) =>
+                  edit({ ...draft, priceCacheWrite })
+                }
+              />
+            </div>
+          ) : null}
           {saveError ? (
             <ApiErrorPanel
               context="the settings were not saved"

frontend/packages/swarm-ui/src/pages/review-settings/SettingsTypes.ts

@@ -6,12 +6,36 @@
 export const EFFORTS = ["low", "medium", "high", "xhigh", "max"] as const;
 export type Effort = (typeof EFFORTS)[number];
 
-/** The settings in force. A PUT replaces them whole. */
+/** Which runtime a classification runs on: the claude CLI on the Anthropic
+ * API key, or opencode on an ACP provider. */
+export const RUNTIMES = ["api-key", "acp"] as const;
+export type Runtime = (typeof RUNTIMES)[number];
+
+/** What the provider charges, in USD per million tokens. A cache price left
+ * out counts as `input`. */
+export interface AcpPrices {
+  input: number;
+  output: number;
+  cache_read?: number;
+  cache_write?: number;
+}
+
+/** The provider the ACP runtime runs on. */
+export interface AcpSettings {
+  base_url: string;
+  model: string;
+  prices: AcpPrices;
+}
+
+/** The settings in force. A PUT changes only the fields it carries. */
 export interface ClassifierSettingsBody {
   model: string;
   /** `null` is claude's own default, which passes no `--effort`. */
   effort: Effort | null;
   max_concurrent_reviews: number;
+  runtime: Runtime;
+  /** The provider record. It stays stored while the runtime is `api-key`. */
+  acp: AcpSettings | null;
 }
 
 /** The form's fields as the user typed them. */
@@ -20,16 +44,36 @@ export interface SettingsDraft {
   /** An effort, or `""` for claude's default. */
   effort: string;
   max: string;
+  runtime: Runtime;
+  acpUrl: string;
+  acpModel: string;
+  /** USD per million tokens. The two cache prices may be `""`. */
+  priceInput: string;
+  priceOutput: string;
+  priceCacheRead: string;
+  priceCacheWrite: string;
 }
 
 export const MIN_REVIEWS = 1;
 export const MAX_REVIEWS = 8;
 
 export function draftOf(s: ClassifierSettingsBody): SettingsDraft {
+  const acp = s.acp;
   return {
     model: s.model,
     effort: s.effort ?? "",
     max: String(s.max_concurrent_reviews),
+    runtime: s.runtime,
+    acpUrl: acp?.base_url ?? "",
+    acpModel: acp?.model ?? "",
+    priceInput: acp ? String(acp.prices.input) : "",
+    priceOutput: acp ? String(acp.prices.output) : "",
+    priceCacheRead:
+      acp?.prices.cache_read !== undefined ? String(acp.prices.cache_read) : "",
+    priceCacheWrite:
+      acp?.prices.cache_write !== undefined
+        ? String(acp.prices.cache_write)
+        : "",
   };
 }
 
@@ -42,6 +86,34 @@ export function maxValue(text: string): number | null {
   return n >= MIN_REVIEWS && n <= MAX_REVIEWS ? n : null;
 }
 
+/** A price as a number, or null when it is not a number of 0 or more. */
+export function priceValue(text: string): number | null {
+  const t = text.trim();
+  if (!/^\d+(\.\d+)?$/.test(t)) return null;
+  return Number(t);
+}
+
+/** Why the provider fields are not ready to save, or null when they are. */
+function acpProblem(d: SettingsDraft): string | null {
+  const url = d.acpUrl.trim();
+  if (!url.startsWith("https://") || /\s/.test(url)) {
+    return "the provider URL starts with https://";
+  }
+  const model = d.acpModel.trim();
+  if (model === "" || /\s/.test(model)) {
+    return "give the provider's model, one word as the provider names it";
+  }
+  if (priceValue(d.priceInput) === null || priceValue(d.priceOutput) === null) {
+    return "give the input and output price, a number of 0 or more";
+  }
+  for (const cache of [d.priceCacheRead, d.priceCacheWrite]) {
+    if (cache.trim() !== "" && priceValue(cache) === null) {
+      return "a cache price is a number of 0 or more, or empty";
+    }
+  }
+  return null;
+}
+
 /** Why the draft is not ready to save, or null when it is. */
 export function settingsProblem(d: SettingsDraft): string | null {
   const model = d.model.trim();
@@ -52,16 +124,38 @@ export function settingsProblem(d: SettingsDraft): string | null {
   if (maxValue(d.max) === null) {
     return `concurrent reviews is a whole number from ${MIN_REVIEWS} to ${MAX_REVIEWS}`;
   }
-  return null;
+  return d.runtime === "acp" ? acpProblem(d) : null;
 }
 
-/** The draft as the request body. Call only when `settingsProblem` is null. */
-export function toSettings(d: SettingsDraft): ClassifierSettingsBody {
-  return {
+/** The provider fields as the request carries them. Call only when
+ * `acpProblem` is null. */
+function toAcp(d: SettingsDraft): AcpSettings {
+  const prices: AcpPrices = {
+    input: priceValue(d.priceInput) ?? 0,
+    output: priceValue(d.priceOutput) ?? 0,
+  };
+  if (d.priceCacheRead.trim() !== "") {
+    prices.cache_read = priceValue(d.priceCacheRead) ?? 0;
+  }
+  if (d.priceCacheWrite.trim() !== "") {
+    prices.cache_write = priceValue(d.priceCacheWrite) ?? 0;
+  }
+  return { base_url: d.acpUrl.trim(), model: d.acpModel.trim(), prices };
+}
+
+/** The draft as the request body. Call only when `settingsProblem` is null.
+ * On the API key runtime the body leaves `acp` out, so the stored provider
+ * stays for the next switch back. */
+export function toSettings(
+  d: SettingsDraft,
+): Omit<ClassifierSettingsBody, "acp"> & { acp?: AcpSettings } {
+  const body = {
     model: d.model.trim(),
     effort: d.effort === "" ? null : (d.effort as Effort),
     max_concurrent_reviews: maxValue(d.max) ?? MIN_REVIEWS,
+    runtime: d.runtime,
   };
+  return d.runtime === "acp" ? { ...body, acp: toAcp(d) } : body;
 }
 
 /** Whether `d` would save something other than `saved`. */
@@ -71,9 +165,20 @@ export function changed(
 ): boolean {
   if (saved === null) return true;
   const now = draftOf(saved);
-  return (
+  const base =
     d.model.trim() !== now.model ||
     d.effort !== now.effort ||
-    d.max.trim() !== now.max
+    d.max.trim() !== now.max ||
+    d.runtime !== now.runtime;
+  if (base) return true;
+  // The provider fields only save on the ACP runtime.
+  return (
+    d.runtime === "acp" &&
+    (d.acpUrl.trim() !== now.acpUrl ||
+      d.acpModel.trim() !== now.acpModel ||
+      d.priceInput.trim() !== now.priceInput ||
+      d.priceOutput.trim() !== now.priceOutput ||
+      d.priceCacheRead.trim() !== now.priceCacheRead ||
+      d.priceCacheWrite.trim() !== now.priceCacheWrite)
   );
 }