feat: claude quotas

Reviewed-on: #19

README.md

@@ -13,6 +13,8 @@ opencode service restart
 
 Choose any plugin subset; Multi-work requires Agents first.
 
+Quota shows ChatGPT limits for the connected OpenAI account and, when Claude Code is logged in, Claude subscription limits read from `${CLAUDE_CONFIG_DIR:-~/.claude}/.credentials.json` (read-only; Claude Code refreshes the token).
+
 ## Local installation
 
 From a local checkout, run:

src/claude-quota.ts

@@ -0,0 +1,200 @@
+import { readFile } from "node:fs/promises";
+import { homedir } from "node:os";
+import { join } from "node:path";
+import type { Schema } from "effect";
+import { z } from "zod";
+import type { QuotaSnapshot, QuotaStatus, QuotaWindow } from "./quota.js";
+
+const USAGE_URL = "https://api.anthropic.com/api/oauth/usage";
+const POLL_MS = 60_000;
+const TIMEOUT_MS = 5_000;
+const WEEK = 604_800;
+
+type QuotaFetch = (input: string | URL | Request, init?: RequestInit) => Promise<Response>;
+
+export function claudeCredentialsPath() {
+    return join(process.env.CLAUDE_CONFIG_DIR ?? join(homedir(), ".claude"), ".credentials.json");
+}
+
+const credentials = z.object({
+    claudeAiOauth: z.object({
+        accessToken: z.string(),
+        expiresAt: z.number(),
+        subscriptionType: z.string().nullish(),
+    }),
+});
+
+const usageWindow = z
+    .object({ utilization: z.number().finite(), resets_at: z.string().nullish() })
+    .nullish();
+const usagePayload = z.object({
+    five_hour: usageWindow,
+    seven_day: usageWindow,
+    seven_day_opus: usageWindow,
+    seven_day_sonnet: usageWindow,
+    limits: z
+        .array(
+            z.object({
+                kind: z.string(),
+                percent: z.number().finite(),
+                resets_at: z.string().nullish(),
+                scope: z
+                    .object({
+                        model: z.object({ id: z.string(), display_name: z.string() }).nullish(),
+                    })
+                    .nullish(),
+            }),
+        )
+        .nullish()
+        .catch(undefined),
+});
+
+function window(
+    id: string,
+    seconds: number,
+    used: number,
+    resetsAt: string | null | undefined,
+    label: string | null = null,
+): QuotaWindow {
+    return {
+        id,
+        label,
+        seconds,
+        used: Math.max(0, Math.min(100, used)),
+        resetsAt: resetsAt ? Date.parse(resetsAt) : Number.NaN,
+    };
+}
+
+/** Normalize the Claude OAuth usage payload into quota windows. */
+export function normalizeClaudeQuota(
+    input: Schema.Json,
+    plan: string,
+    fetchedAt = Date.now(),
+): QuotaSnapshot | undefined {
+    const parsed = usagePayload.safeParse(input);
+    if (!parsed.success) return;
+    const data = parsed.data;
+    const windows: QuotaWindow[] = [];
+    for (const [key, seconds, label] of [
+        ["five_hour", 18_000, null],
+        ["seven_day", WEEK, null],
+        ["seven_day_opus", WEEK, "Opus"],
+        ["seven_day_sonnet", WEEK, "Sonnet"],
+    ] as const) {
+        const item = data[key];
+        if (item)
+            windows.push(window(`claude:${key}`, seconds, item.utilization, item.resets_at, label));
+    }
+    for (const limit of data.limits ?? []) {
+        const model = limit.scope?.model;
+        if (limit.kind !== "weekly_scoped" || !model) continue;
+        if (windows.some((item) => item.label === model.display_name)) continue;
+        windows.push(
+            window(
+                `claude:weekly_scoped:${model.id}`,
+                WEEK,
+                limit.percent,
+                limit.resets_at,
+                model.display_name,
+            ),
+        );
+    }
+    if (windows.length === 0) return;
+    return { plan: plan.toLowerCase(), fetchedAt, windows };
+}
+
+export class ClaudeQuotaTracker {
+    private latest: QuotaSnapshot | undefined;
+    private timer: ReturnType<typeof setInterval> | undefined;
+    private request: Promise<void> | undefined;
+    private controller: AbortController | undefined;
+    private disposed = false;
+
+    constructor(
+        private readonly changed: () => Promise<void>,
+        private readonly fetcher: QuotaFetch = fetch,
+        private readonly pollMs = POLL_MS,
+        private readonly path = claudeCredentialsPath(),
+    ) {}
+
+    async init() {
+        this.timer = setInterval(() => void this.refresh(), this.pollMs);
+        await this.refresh();
+    }
+
+    refresh(): Promise<void> {
+        if (this.disposed) return Promise.resolve();
+        this.request ??= this.query().finally(() => {
+            this.request = undefined;
+        });
+        return this.request;
+    }
+
+    private async query() {
+        try {
+            let credential: z.infer<typeof credentials>["claudeAiOauth"] | undefined;
+            try {
+                const parsed = credentials.safeParse(JSON.parse(await readFile(this.path, "utf8")));
+                credential = parsed.success ? parsed.data.claudeAiOauth : undefined;
+            } catch {
+                credential = undefined;
+            }
+            if (!credential) {
+                if (this.latest) {
+                    this.latest = undefined;
+                    await this.changed();
+                }
+                return;
+            }
+            if (credential.expiresAt <= Date.now() || this.disposed) return;
+            const controller = new AbortController();
+            this.controller = controller;
+            const timeout = setTimeout(() => controller.abort(), TIMEOUT_MS);
+            let response: Response;
+            try {
+                response = await this.fetcher(USAGE_URL, {
+                    headers: {
+                        Authorization: `Bearer ${credential.accessToken}`,
+                        "anthropic-beta": "oauth-2025-04-20",
+                        Accept: "application/json",
+                    },
+                    signal: controller.signal,
+                });
+            } finally {
+                clearTimeout(timeout);
+                if (this.controller === controller) this.controller = undefined;
+            }
+            if (!response.ok) return;
+            // SAFETY: Response.json yields JSON values; usagePayload validates fields used.
+            const payload = (await response.json()) as Schema.Json;
+            const snapshot = normalizeClaudeQuota(
+                payload,
+                credential.subscriptionType ?? "unknown",
+            );
+            if (!snapshot || this.disposed) return;
+            this.latest = snapshot;
+            await this.changed();
+        } catch {
+            return;
+        }
+    }
+
+    status(): QuotaStatus | undefined {
+        if (!this.latest) return;
+        return {
+            ...this.latest,
+            windows: this.latest.windows.map((item) => ({
+                ...item,
+                remaining: Math.max(0, 100 - item.used),
+            })),
+        };
+    }
+
+    async dispose() {
+        this.disposed = true;
+        this.controller?.abort();
+        if (this.timer) clearInterval(this.timer);
+        this.timer = undefined;
+        await this.request;
+    }
+}

src/quota-plugin.ts

@@ -1,4 +1,5 @@
 import { Plugin } from "@opencode/plugin";
+import { ClaudeQuotaTracker } from "./claude-quota.js";
 import { QuotaTracker } from "./quota.js";
 import { QuotaRpc } from "./quota-rpc.js";
 
@@ -9,9 +10,14 @@ export default Plugin.define({
         const quota = new QuotaTracker(context, async () => {
             await registration.events.emit("updated", {});
         });
+        const claude = new ClaudeQuotaTracker(async () => {
+            await registration.events.emit("updated", {});
+        });
         const registration = await context.rpc.register(QuotaRpc, {
             status: async () => quota.status() ?? null,
+            claude: async () => claude.status() ?? null,
         });
+        void claude.init();
         await quota.init();
         const updates = (async () => {
             for await (const event of context.event.subscribe({ signal: controller.signal })) {
@@ -29,7 +35,7 @@ export default Plugin.define({
                     event.type === "session.execution.interrupted" ||
                     event.type === "session.idle"
                 ) {
-                    await quota.complete(event.data.sessionID);
+                    await Promise.all([quota.complete(event.data.sessionID), claude.refresh()]);
                 } else if (event.type === "credential.updated") {
                     await quota.authChanged();
                 } else if (
@@ -47,7 +53,7 @@ export default Plugin.define({
         return async () => {
             controller.abort();
             await updates;
-            await quota.dispose();
+            await Promise.all([quota.dispose(), claude.dispose()]);
             await registration.dispose();
         };
     },

src/quota-rpc.ts

@@ -10,15 +10,15 @@ const window = z.object({
     remaining: z.number(),
 });
 
+const status = z
+    .object({ plan: z.string(), fetchedAt: z.number(), windows: z.array(window) })
+    .nullable();
+
 export const QuotaRpc = Rpc.define({
     id: "stanp-opencode.quota",
     methods: {
-        status: {
-            input: z.object({}),
-            output: z
-                .object({ plan: z.string(), fetchedAt: z.number(), windows: z.array(window) })
-                .nullable(),
-        },
+        status: { input: z.object({}), output: status },
+        claude: { input: z.object({}), output: status },
     },
     events: { updated: { schema: z.object({}) } },
 });

src/tui.tsx

@@ -61,24 +61,44 @@ export default Plugin.define({
         });
 
         const Slot = (props: { instance: string; centered?: boolean; visible?: () => boolean }) => {
-            const [status] = createResource(
+            const [statuses] = createResource(
                 () => (props.visible?.() === false ? false : `${props.instance}:${revision()}`),
-                () => loadQuotaStatus(() => quota.status({})),
+                async () => {
+                    const [chatgpt, claude] = await Promise.all([
+                        loadQuotaStatus(() => quota.status({})),
+                        loadQuotaStatus(() => quota.claude({})),
+                    ]);
+                    return chatgpt || claude ? { chatgpt, claude } : null;
+                },
+            );
+            const Section = (section: { title: string; status: QuotaStatus | null }) => (
+                <Show when={section.status}>
+                    {(status: () => QuotaStatus) => (
+                        <>
+                            <text fg={context.theme.text.default}>
+                                <b>
+                                    {section.title} quota ({status().plan})
+                                </b>
+                            </text>
+                            <For each={status().windows}>
+                                {(window) => (
+                                    <text fg={context.theme.text.muted}>
+                                        {formatQuotaWindow(window)}
+                                    </text>
+                                )}
+                            </For>
+                        </>
+                    )}
+                </Show>
             );
             const Content = () => (
                 <box flexDirection="column">
-                    <text fg={context.theme.text.default}>
-                        <b>ChatGPT quota ({status()!.plan})</b>
-                    </text>
-                    <For each={status()!.windows}>
-                        {(window) => (
-                            <text fg={context.theme.text.muted}>{formatQuotaWindow(window)}</text>
-                        )}
-                    </For>
+                    <Section title="ChatGPT" status={statuses()!.chatgpt} />
+                    <Section title="Claude" status={statuses()!.claude} />
                 </box>
             );
             return (
-                <Show when={status()}>
+                <Show when={statuses()}>
                     <Show when={props.centered} fallback={<Content />}>
                         <box position="absolute" top={2} left={0} width="100%" alignItems="center">
                             <Content />

tests/claude-quota.test.ts

@@ -0,0 +1,158 @@
+import { afterEach, beforeEach, expect, test } from "bun:test";
+import { mkdtemp, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { ClaudeQuotaTracker, normalizeClaudeQuota } from "../src/claude-quota.js";
+
+const payload = {
+    five_hour: { utilization: 12.5, resets_at: "2026-10-07T12:00:00+00:00" },
+    seven_day: { utilization: 140, resets_at: null },
+    seven_day_opus: null,
+    seven_day_sonnet: { utilization: 3, resets_at: "2026-10-10T00:00:00+00:00" },
+    limits: [
+        { kind: "session", percent: 12.5, resets_at: "2026-10-07T12:00:00+00:00", scope: null },
+        {
+            kind: "weekly_scoped",
+            percent: 40,
+            resets_at: "2026-10-10T00:00:00+00:00",
+            scope: { model: { id: "claude-fable-5-1", display_name: "Fable" } },
+        },
+        {
+            kind: "weekly_scoped",
+            percent: 3,
+            resets_at: "2026-10-10T00:00:00+00:00",
+            scope: { model: { id: "claude-sonnet-5-5", display_name: "Sonnet" } },
+        },
+    ],
+    extra_usage: { is_enabled: false },
+};
+
+let dir: string;
+let path: string;
+beforeEach(async () => {
+    dir = await mkdtemp(join(tmpdir(), "claude-quota-"));
+    path = join(dir, ".credentials.json");
+});
+afterEach(async () => {
+    await rm(dir, { recursive: true, force: true });
+});
+
+function credentials(expiresAt: number) {
+    return JSON.stringify({
+        claudeAiOauth: {
+            accessToken: "token-123",
+            refreshToken: "refresh",
+            expiresAt,
+            scopes: ["user:inference"],
+            subscriptionType: "Max",
+            rateLimitTier: "default_claude_max_20x",
+        },
+    });
+}
+
+test("normalizes Claude usage windows", () => {
+    expect(normalizeClaudeQuota(payload, "Max", 1)).toEqual({
+        plan: "max",
+        fetchedAt: 1,
+        windows: [
+            {
+                id: "claude:five_hour",
+                label: null,
+                seconds: 18_000,
+                used: 12.5,
+                resetsAt: Date.parse("2026-10-07T12:00:00Z"),
+            },
+            {
+                id: "claude:seven_day",
+                label: null,
+                seconds: 604_800,
+                used: 100,
+                resetsAt: Number.NaN,
+            },
+            {
+                id: "claude:seven_day_sonnet",
+                label: "Sonnet",
+                seconds: 604_800,
+                used: 3,
+                resetsAt: Date.parse("2026-10-10T00:00:00Z"),
+            },
+            {
+                id: "claude:weekly_scoped:claude-fable-5-1",
+                label: "Fable",
+                seconds: 604_800,
+                used: 40,
+                resetsAt: Date.parse("2026-10-10T00:00:00Z"),
+            },
+        ],
+    });
+    expect(normalizeClaudeQuota({ five_hour: null, seven_day: null }, "pro")).toBeUndefined();
+});
+
+test("reads credentials file and sends OAuth usage request", async () => {
+    await writeFile(path, credentials(Date.now() + 3_600_000));
+    const calls: Array<{ url: string; headers: Headers }> = [];
+    let changed = 0;
+    const tracker = new ClaudeQuotaTracker(
+        async () => {
+            changed++;
+        },
+        async (input, init) => {
+            calls.push({ url: String(input), headers: new Headers(init?.headers) });
+            return Response.json(payload);
+        },
+        60_000,
+        path,
+    );
+    await tracker.init();
+    expect(calls).toHaveLength(1);
+    expect(calls[0]!.url).toBe("https://api.anthropic.com/api/oauth/usage");
+    expect(calls[0]!.headers.get("authorization")).toBe("Bearer token-123");
+    expect(calls[0]!.headers.get("anthropic-beta")).toBe("oauth-2025-04-20");
+    expect(calls[0]!.headers.get("accept")).toBe("application/json");
+    expect(tracker.status()?.plan).toBe("max");
+    expect(tracker.status()?.windows[0]?.remaining).toBe(87.5);
+    expect(changed).toBe(1);
+
+    await rm(path);
+    await tracker.refresh();
+    expect(tracker.status()).toBeUndefined();
+    expect(changed).toBe(2);
+    await tracker.dispose();
+});
+
+test("missing credentials file yields no status", async () => {
+    let calls = 0;
+    const tracker = new ClaudeQuotaTracker(
+        async () => {},
+        async () => {
+            calls++;
+            return Response.json(payload);
+        },
+        60_000,
+        path,
+    );
+    await tracker.init();
+    expect(calls).toBe(0);
+    expect(tracker.status()).toBeUndefined();
+    await tracker.dispose();
+});
+
+test("expired token skips fetch and keeps last snapshot", async () => {
+    await writeFile(path, credentials(Date.now() + 3_600_000));
+    let calls = 0;
+    const tracker = new ClaudeQuotaTracker(
+        async () => {},
+        async () => {
+            calls++;
+            return Response.json(payload);
+        },
+        60_000,
+        path,
+    );
+    await tracker.init();
+    await writeFile(path, credentials(Date.now() - 1));
+    await tracker.refresh();
+    expect(calls).toBe(1);
+    expect(tracker.status()?.windows).toHaveLength(4);
+    await tracker.dispose();
+});