feat: add Muse Spark support

README.md

@@ -120,15 +120,16 @@ npx @expo/code-review-cli doctor
 The scaffolded default is **Anthropic via the Claude Code CLI**: locally your
 `claude` login is enough, and for CI it helps you mint a token with
 `claude setup-token`. It also handles the alternatives (an OpenAI **API key**,
-a **ChatGPT/Codex subscription** sign-in). `doctor` offers to run it whenever a
-credential is missing.
+a **ChatGPT/Codex subscription** sign-in, or a Meta Model API key for **Muse
+Spark**). `doctor` offers to run it whenever a credential is missing.
 
 In CI, store the credential as the repo secret the scaffolded workflow forwards
 (`CLAUDE_CODE_REVIEW_SHARED_API_TOKEN` by default — an `sk-ant-oat…` token from
 `claude setup-token`, or an `sk-ant-api…` Console key; the CLI reads either).
 
-Prefer **OpenAI** (API key, or a ChatGPT/Codex subscription, or both mixed) or
-another provider? See [Other providers & auth modes](#other-providers) below.
+Prefer **Muse Spark**, **OpenAI** (API key, or a ChatGPT/Codex subscription, or
+both mixed), or another provider? See [Other providers & auth modes](#other-providers)
+below.
 
 ### Reviewing (already configured)
 
@@ -721,6 +722,27 @@ fallback key; `ecr doctor` diagnoses setup.
   } }
   ```
 
+- **Meta / Muse Spark 1.2 (public Model API).** Set the default model and any
+  model-pinned agent frontmatter to `meta/muse-spark-1.2`. ECR supplies the fixed
+  public Responses endpoint and the `@ai-sdk/openai` adapter; the generic
+  Chat-Completions compatibility adapter is intentionally not used because it
+  loses Muse's reasoning continuity across tool turns. Standard and Contributor
+  model ids are supported.
+
+  ```jsonc
+  "model": "meta/muse-spark-1.2",
+  "auth": { "providers": {
+    "meta": { "mode": "api-key", "tokenEnv": "META_API_KEY" }
+  } }
+  ```
+
+  Create the key in the [Meta AI developer portal](https://developer.meta.com/ai/).
+  Locally, export it as `META_API_KEY`. In each review-running workflow, replace
+  the Anthropic credential line with
+  `META_API_KEY: ${{ secrets.META_API_KEY }}`, set the repo variable
+  `ECR_EXPECTED_TOKEN_ENV=META_API_KEY`, and remove the Claude CLI install step
+  if no configured agent uses an `anthropic/…` model. Muse runs with high reasoning.
+
 - **OpenAI: ChatGPT/Codex subscription (OAuth) + usage-based API key** — the
   recommended mix if you review with OpenAI. Default models run on the
   subscription (zero marginal cost); a metered key covers subscription-excluded

llp/0003-model-runtimes-and-credentials.explainer.md

@@ -96,6 +96,26 @@ POSIX, where `execvp` never searches cwd. This is a knowingly accepted residual,
 oversight, and must not be silently reintroduced as a "fix" ([observed]
 `opencode.ts:305-314`).
 
+### Muse Spark via Meta Model API
+
+Muse Spark uses the existing OpenCode engine, but OpenCode `1.18.4` does not ship a
+resolvable `meta` provider. `buildOpencodeConfig` therefore synthesizes one only for an
+in-use `meta` API-key entry without an `upstream`; an entry with `upstream` remains an
+alias and never redirects that upstream's credential to Meta. The native provider's
+destination is fixed to `https://api.meta.ai/v1`, its credential is an environment
+interpolation (never the key value), and its adapter is `@ai-sdk/openai` so requests use
+the Responses API and preserve encrypted reasoning across tool turns. The generic
+`@ai-sdk/openai-compatible` adapter is deliberately not used because its Chat
+Completions path loses that continuity [observed:
+`opencode.ts` `META_MODEL_API_BASE_URL` / `META_MUSE_MODELS` / `buildOpencodeConfig`].
+
+The declared model catalog is an allowlist (`muse-spark-1.2` and
+`muse-spark-1.2-contributor`), not a reflection of arbitrary config strings. This keeps
+the existing preflight honest: a misspelled or not-yet-supported Meta model remains
+absent from the server's provider model list and fails once before any pass. Both models
+declare their public context/output limits, multimodal inputs, high reasoning, and
+encrypted reasoning inclusion [observed: `opencode.ts` `META_MUSE_MODELS`].
+
 ## Claude Code CLI Containment
 
 The Claude Code engine runs each review pass as a single stateless

llp/0007-cli-commands-and-ci.explainer.md

@@ -137,6 +137,7 @@ doctor resolves auth the way real reviews do: a `routing.jsonc` `defaults.auth`
 - It hands out only ACCESS tokens; the refresh token never leaves OpenCode's store, because OpenCode's refresh tokens are SINGLE-USE (rotation) and OpenCode is their sole legitimate consumer — a copy in a shell config or CI secret dies on the next rotation and can take the whole sign-in down with it [observed: `src/commands/setup-auth.ts:87-93`].
 - The exported shell line single-quotes the token value so a token containing shell metacharacters (`$HOME`, `!`) is never expanded when sourced [observed: `src/commands/setup-auth.ts:127-131`; test in `src/__tests__/setup-auth.test.ts`].
 - `anthropic` auth is always satisfied by the Claude Code CLI subscription-login flow regardless of the declared `mode` (oauth vs api-key) — mode is irrelevant for that provider [observed: `src/commands/setup-auth.ts:50-59`].
+- A `meta` API-key entry is a manual-key plan: setup-auth points to the Meta AI developer portal and prints the configured `META_API_KEY` export, while doctor uses the same generic provider readiness check as the real review [observed: `src/commands/setup-auth.ts` `planFromAuth` / manual-key guidance; `src/core/auth.ts` `PROVIDER_KEY_ENV`].
 - The two interactive logins run via `spawnSync` with `stdio: "inherit"` and `cwd: os.tmpdir()` — the tmpdir cwd keeps a possibly-untrusted checkout from becoming the login subprocess's working directory, and the `inherit` stdio is why these two calls cannot be converted to `exec.ts`'s capturing `run()` [observed: `src/commands/setup-auth.ts:200-203,256-259`].
 
 ## init and dismiss

llp/0009-adoption-templates-and-ci-workflows.guide.md

@@ -55,6 +55,15 @@ The three workflows share a posture built entirely around one fact: a reviewer j
 
 **Concurrency defaults by auth mode.** The commented `chunk.concurrency` default is 6 for an API key and 3 for a subscription (OAuth) credential, "one account handles many parallel streams poorly, and several PRs may review on the same credential at once" [observed: `templates/config.jsonc:28-30`].
 
+**Muse Spark is opt-in without weakening the default secret surface.** The root config
+documents `meta/muse-spark-1.2` plus a `META_API_KEY` auth entry, and each
+review-running workflow shows the corresponding secret line commented out. It is not
+forwarded by the default scaffold: adopters replace the Anthropic line and set
+`ECR_EXPECTED_TOKEN_ENV=META_API_KEY`, so the model process receives only the
+credential actually selected by trusted config. The default remains Anthropic and
+`dismiss.yml` still receives no model credential [observed: `templates/config.jsonc`;
+`templates/workflow.yml`, `command.yml`, and `atlantis.yml`].
+
 **Keep the `**/*` catch-all first in `routing.jsonc`.** Scopes match last-match-wins, so a `**/*` catch-all must come first and more specific scopes come after to override it [observed: `templates/routing.jsonc:27-31`; `AGENTS.md:17-18`]. Nothing validates the order — reversing it silently changes which config applies to already-routed files [inferred: no code checks that the `**/*` catch-all comes first, so reversing it silently changes routing].
 
 **`scope-config.jsonc` deliberately omits `auth` and `commentTag`.** It is a *different* template from the root `config.jsonc`, not a copy. A scope config carries no `auth` block — credentials are root-only, and the loader plus the CI guard reject a scope config that declares one [observed: `templates/scope-config.jsonc:1-3`; `AGENTS.md:51`]. It also omits `commentTag`, because a scope's PR-comment marker is always derived as `<rootTag>:<scope-name>` so `ecr ci` and `ecr review --scope --post` target the same comment; declaring one is rejected by the scope schema [observed: `templates/scope-config.jsonc:23-25`]. Reusing the root `config.jsonc` template for a scope — a tempting "simplification" — would break the trust boundary (LLP 0006).

src/__tests__/auth.test.ts

@@ -270,6 +270,25 @@ test("checkProviderAuth: an entry for an IN-USE provider is still enforced", ()
   expect(r.detail).toContain("openai");
 });
 
+test("checkProviderAuth: Meta uses META_API_KEY and rejects cross-provider reuse", () => {
+  const meta = cfgWithModels(["meta/muse-spark-1.2"], {
+    mode: "api-key",
+    provider: "meta",
+    tokenEnv: "META_API_KEY",
+  });
+  expect(checkProviderAuth(meta, {}).detail).toContain("META_API_KEY");
+  expect(checkProviderAuth(meta, { META_API_KEY: "meta-review-key" }).ok).toBe(true);
+
+  const wrongOwner = cfgWithModels(["openai/gpt-5.5"], {
+    mode: "api-key",
+    provider: "openai",
+    tokenEnv: "META_API_KEY",
+  });
+  const result = checkProviderAuth(wrongOwner, { META_API_KEY: "meta-review-key" });
+  expect(result.ok).toBe(false);
+  expect(result.detail).toContain("meta's well-known credential env");
+});
+
 test("prepareAuth: does not forward a dead unused-provider api-key into its key env", async () => {
   // An entry for a provider no model uses must not have its tokenEnv copied into the
   // provider key env — checkProviderAuth skips its guard, so forwarding would

src/__tests__/opencode.test.ts

@@ -13,6 +13,7 @@ import {
   resolveEngineDispatch,
   resolveOpencodeCli,
   STACK_VERIFIER_AGENT,
+  META_MODEL_API_BASE_URL,
 } from "../core/opencode.js";
 import type { OpencodeHandle } from "../core/opencode.js";
 import type { ClaudeCodeHandle } from "../core/claude-code.js";
@@ -341,6 +342,85 @@ test("an upstream-alias auth entry synthesizes a provider block with exactly the
   expect(opencode.provider?.openai).toBeUndefined();
 });
 
+test("Meta auth synthesizes the public Muse Responses provider without embedding its key", () => {
+  const config = configWith({
+    agents: [{ id: "correctness", model: "meta/muse-spark-1.2" }],
+    coordinatorModel: "meta/muse-spark-1.2",
+    auth: [{ mode: "api-key", provider: "meta", tokenEnv: "META_API_KEY" }],
+  });
+  const opencode = buildOpencodeConfig(config) as {
+    provider?: Record<
+      string,
+      {
+        npm: string;
+        options: { baseURL: string; apiKey: string };
+        models: Record<string, { reasoning?: boolean; options?: Record<string, unknown> }>;
+      }
+    >;
+  };
+  const meta = opencode.provider?.meta;
+  expect(meta).toBeDefined();
+  expect(meta!.npm).toBe("@ai-sdk/openai");
+  expect(meta!.options).toEqual({
+    baseURL: META_MODEL_API_BASE_URL,
+    apiKey: "{env:META_API_KEY}",
+  });
+  expect(Object.keys(meta!.models)).toEqual(["muse-spark-1.2"]);
+  expect(meta!.models["muse-spark-1.2"]?.reasoning).toBe(true);
+  expect(meta!.models["muse-spark-1.2"]?.options).toMatchObject({
+    reasoningEffort: "high",
+    include: ["reasoning.encrypted_content"],
+  });
+});
+
+test("a Meta-named upstream alias does not redirect the upstream credential to Meta", () => {
+  const config = configWith({
+    agents: [{ id: "correctness", model: "meta/muse-spark-1.2" }],
+    coordinatorModel: "meta/muse-spark-1.2",
+    auth: [
+      {
+        mode: "api-key",
+        provider: "meta",
+        tokenEnv: "CLAUDE_CODE_REVIEW_SHARED_API_TOKEN",
+        upstream: "anthropic",
+      },
+    ],
+  });
+  const opencode = buildOpencodeConfig(config) as {
+    provider?: Record<
+      string,
+      { npm: string; options: { apiKey: string; baseURL?: string }; models: object }
+    >;
+  };
+  const alias = opencode.provider?.meta;
+  expect(alias).toBeDefined();
+  expect(alias!.npm).toBe("@ai-sdk/anthropic");
+  expect(alias!.options).toEqual({ apiKey: "{env:CLAUDE_CODE_REVIEW_SHARED_API_TOKEN}" });
+  expect(alias!.options.baseURL).toBeUndefined();
+  expect(Object.keys(alias!.models)).toEqual(["muse-spark-1.2"]);
+});
+
+test("Meta provider does not register an unknown Muse id, so preflight can reject it", () => {
+  const config = configWith({
+    agents: [{ id: "correctness", model: "meta/muse-spark-typo" }],
+    coordinatorModel: "meta/muse-spark-typo",
+    auth: [{ mode: "api-key", provider: "meta", tokenEnv: "META_API_KEY" }],
+  });
+  const opencode = buildOpencodeConfig(config) as {
+    provider?: Record<string, { models: Record<string, unknown> }>;
+  };
+  expect(opencode.provider?.meta?.models).toEqual({});
+  expect(
+    findUnknownModels(["meta/muse-spark-typo"], { meta: ["muse-spark-1.2"] }, ["meta"]),
+  ).toEqual([
+    {
+      model: "meta/muse-spark-typo",
+      reason: "model",
+      suggestions: ["muse-spark-1.2"],
+    },
+  ]);
+});
+
 test("buildOpencodeConfig registers the no-tools stack verifier (empty tool list)", () => {
   const opencode = buildOpencodeConfig(configWith({})) as {
     agent: Record<string, { tools: Record<string, boolean> }>;

src/__tests__/research.test.ts

@@ -52,6 +52,7 @@ test("the wrapper hands the MCP server a constructed environment, not an inherit
           PATH: process.env.PATH ?? "",
           HOME: "/root",
           ANTHROPIC_API_KEY: "must-not-reach-the-server",
+          META_API_KEY: "must-not-reach-the-server",
           CLAUDE_CODE_OAUTH_TOKEN: "must-not-reach-the-server",
           AWS_SECRET_ACCESS_KEY: "must-not-reach-the-server",
           GITHUB_TOKEN: "must-not-reach-the-server",
@@ -93,6 +94,7 @@ test("research child environment forwards only locale, proxy variables, and the
       no_proxy: "localhost",
       BRAVE_SEARCH_API_KEY: "search-only",
       SECRET_TOKEN: "must-not-be-forwarded",
+      META_API_KEY: "must-not-be-forwarded",
       PATH: "/private/bin",
     }),
   ).toMatchObject({
@@ -103,6 +105,7 @@ test("research child environment forwards only locale, proxy variables, and the
     BRAVE_SEARCH_API_KEY: "search-only",
   });
   expect(researchChildEnvironment({ SECRET_TOKEN: "nope" })).not.toHaveProperty("SECRET_TOKEN");
+  expect(researchChildEnvironment({ META_API_KEY: "nope" })).not.toHaveProperty("META_API_KEY");
   expect(researchChildEnvironment({ PATH: "/private/bin" })).not.toHaveProperty("PATH");
 });
 

src/__tests__/setup-auth.test.ts

@@ -14,6 +14,14 @@ test("plan: the mixed setup needs one ChatGPT login and one manual key", () => {
   expect(plan.unsupported).toEqual([]);
 });
 
+test("plan: Meta Model API is a manual API key setup", () => {
+  const plan = planFromAuth([{ provider: "meta", mode: "api-key", tokenEnv: "META_API_KEY" }]);
+  expect(plan.manualKeys).toEqual([
+    { provider: "meta", tokenEnv: "META_API_KEY", upstream: undefined },
+  ]);
+  expect(plan.unsupported).toEqual([]);
+});
+
 test("plan: an anthropic entry (any mode) → claudeLogin; api-key without tokenEnv needs nothing", () => {
   const plan = planFromAuth([
     // Mode is irrelevant for anthropic — it is always served by the Claude Code CLI.

src/commands/setup-auth.ts

@@ -25,7 +25,8 @@ getting each credential:
     opens your browser) and prints the \`export <tokenEnv>=…\` line for
     CI/headless runs.
   • an API key (api-key entries): prints where to create the key, the exact
-    permissions it needs, and the export line to fill in.
+    permissions it needs, and the export line to fill in. Meta Model API
+    (\`meta/muse-spark-…\`) uses META_API_KEY from the Meta AI developer portal.
 
 Without a repo config, it offers the recommended ChatGPT/Codex subscription flow
 with the default env name.
@@ -300,6 +301,10 @@ export async function setupAuthCommand(argv: string[] = []): Promise<void> {
       } else if (upstream === "anthropic") {
         err("  https://console.anthropic.com/settings/keys — a workspace-scoped key");
         err("  with a spend limit is all the reviewer needs.");
+      } else if (upstream === "meta") {
+        // @ref LLP 0007#doctor-and-setup-auth [implements] — Meta uses a manual API key
+        err("  https://developer.meta.com/ai/ — create a Model API key with access to");
+        err("  Muse Spark, then store it as a dedicated review secret.");
       } else {
         err(`  mint a key for the "${upstream}" provider.`);
       }

src/core/auth.ts

@@ -15,6 +15,7 @@ const PROVIDER_KEY_ENV: Record<string, string> = {
   openai: "OPENAI_API_KEY",
   google: "GOOGLE_GENERATIVE_AI_API_KEY",
   openrouter: "OPENROUTER_API_KEY",
+  meta: "META_API_KEY",
 };
 
 /**

src/core/opencode.ts

@@ -19,6 +19,44 @@ import type { ResearchMcpRuntime } from "./research.js";
 /** Discriminant for the Claude Code CLI engine (see core/claude-code.ts). */
 export const CLAUDE_CODE_ENGINE = "claude-code" as const;
 
+/** Fixed so repo config cannot redirect the Meta credential. */
+// @ref LLP 0003#muse-spark-via-meta-model-api [implements] — fixed endpoint and model allowlist
+export const META_MODEL_API_BASE_URL = "https://api.meta.ai/v1";
+
+/** Supported public Muse models. Unknown ids remain visible to preflight. */
+export const META_MUSE_MODELS: Record<string, Record<string, unknown>> = {
+  "muse-spark-1.2": {
+    name: "Muse Spark 1.2",
+    reasoning: true,
+    limit: { context: 1_048_576, output: 131_072 },
+    modalities: {
+      input: ["text", "image", "pdf", "video"],
+      output: ["text"],
+    },
+    options: {
+      store: false,
+      reasoningEffort: "high",
+      reasoningSummary: "auto",
+      include: ["reasoning.encrypted_content"],
+    },
+  },
+  "muse-spark-1.2-contributor": {
+    name: "Muse Spark 1.2 Contributor",
+    reasoning: true,
+    limit: { context: 1_048_576, output: 131_072 },
+    modalities: {
+      input: ["text", "image", "pdf", "video"],
+      output: ["text"],
+    },
+    options: {
+      store: false,
+      reasoningEffort: "high",
+      reasoningSummary: "auto",
+      include: ["reasoning.encrypted_content"],
+    },
+  },
+};
+
 /**
  * Resolve which engine an agent's pass dispatches to, and (when claude) which
  * claude handle to run it against. The per-agent router (engineOf) wins; absent it
@@ -221,6 +259,28 @@ export function buildOpencodeConfig(
     config.coordinator.model,
   ];
   for (const entry of config.auth) {
+    if (
+      entry.provider === "meta" &&
+      entry.mode === "api-key" &&
+      entry.tokenEnv &&
+      !entry.upstream
+    ) {
+      // Muse needs the Responses adapter; openai-compatible uses Chat Completions.
+      provider.meta = {
+        npm: "@ai-sdk/openai",
+        name: "Meta Model API",
+        options: {
+          baseURL: META_MODEL_API_BASE_URL,
+          apiKey: `{env:${entry.tokenEnv}}`,
+        },
+        models: Object.fromEntries(
+          Object.entries(META_MUSE_MODELS).filter(([model]) =>
+            referencedModels.includes(`meta/${model}`),
+          ),
+        ),
+      };
+      continue;
+    }
     if (!entry.upstream || !entry.tokenEnv) {
       continue;
     }

templates/atlantis.yml

@@ -110,6 +110,8 @@ jobs:
           # Anthropic review credential — the env var named by auth.tokenEnv in
           # config.jsonc (see workflow.yml for the accepted token shapes).
           CLAUDE_CODE_REVIEW_SHARED_API_TOKEN: ${{ secrets.CLAUDE_CODE_REVIEW_SHARED_API_TOKEN }}
+          # Muse alternative (also set ECR_EXPECTED_TOKEN_ENV=META_API_KEY):
+          # META_API_KEY: ${{ secrets.META_API_KEY }}
           # Optional search-only credential for trusted platform documentation research.
           BRAVE_SEARCH_API_KEY: ${{ secrets.BRAVE_SEARCH_API_KEY }}
           # Optional: override the model for every agent.

templates/command.yml

@@ -148,6 +148,8 @@ jobs:
           # by `claude setup-token`, or an `sk-ant-api…` Console key (the Claude
           # Code CLI reads either).
           CLAUDE_CODE_REVIEW_SHARED_API_TOKEN: ${{ secrets.CLAUDE_CODE_REVIEW_SHARED_API_TOKEN }}
+          # Muse alternative (also set ECR_EXPECTED_TOKEN_ENV=META_API_KEY):
+          # META_API_KEY: ${{ secrets.META_API_KEY }}
           # Optional search-only credential for trusted platform documentation research.
           BRAVE_SEARCH_API_KEY: ${{ secrets.BRAVE_SEARCH_API_KEY }}
           # Optional: override the model for every agent.