fix(ai): filter Copilot models by account availability

closes #5897

packages/coding-agent/CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Fixed
 
+- Fixed `/model` to hide GitHub Copilot models that are unavailable to the authenticated account ([#5897](https://github.com/earendil-works/pi/issues/5897)).
 - Fixed `/model` selector search to rank exact provider-prefixed matches before proxy-provider model ID matches ([#5892](https://github.com/earendil-works/pi/issues/5892)).
 
 ## [0.79.8] - 2026-06-19

packages/coding-agent/test/model-registry.test.ts

@@ -1669,6 +1669,25 @@ describe("ModelRegistry", () => {
 				expect(count).toBe(0);
 			});
 
+			test("getAvailable filters GitHub Copilot OAuth models to account picker availability", () => {
+				authStorage.set("github-copilot", {
+					type: "oauth",
+					refresh: "github-access-token",
+					access: "tid=test;exp=9999999999;proxy-ep=proxy.individual.githubcopilot.com;",
+					expires: Date.now() + 60_000,
+					availableModelIds: ["gpt-4.1"],
+				});
+
+				const registry = ModelRegistry.create(authStorage, modelsJsonPath);
+
+				expect(
+					registry
+						.getAvailable()
+						.filter((m) => m.provider === "github-copilot")
+						.map((m) => m.id),
+				).toEqual(["gpt-4.1"]);
+			});
+
 			test("getApiKeyAndHeaders resolves authHeader on every request", async () => {
 				const tokenFile = join(tempDir, "token");
 				writeFileSync(tokenFile, "token-1");