fix(prometheus): respect fallback chain when no explicit model configured
Previously, Prometheus always used params.currentModel (UI-selected model) when no explicit configuration existed. This bypassed the intended fallback chain (claude-opus-4-6 → gpt-5.4 → glm-5 → gemini-3.1-pro). Now, the UI-selected model is only used if it matches one of the models in Prometheus's fallback chain. Otherwise, the fallback chain resolution takes over and finds an available model. Fixes #2986
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@@ -0,0 +1,233 @@
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import { describe, expect, test, spyOn, afterEach, beforeEach } from "bun:test";
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import { buildPrometheusAgentConfig } from "./prometheus-agent-config-builder";
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import * as shared from "../shared";
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import * as categoryResolver from "./category-config-resolver";
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import type { CategoryConfig } from "../config/schema";
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describe("buildPrometheusAgentConfig", () => {
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let fetchAvailableModelsSpy: ReturnType<typeof spyOn>;
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let readConnectedProvidersCacheSpy: ReturnType<typeof spyOn>;
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let resolveCategoryConfigSpy: ReturnType<typeof spyOn>;
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let logSpy: ReturnType<typeof spyOn>;
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beforeEach(() => {
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fetchAvailableModelsSpy = spyOn(shared, "fetchAvailableModels").mockResolvedValue(new Set());
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readConnectedProvidersCacheSpy = spyOn(shared, "readConnectedProvidersCache").mockReturnValue(null);
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resolveCategoryConfigSpy = spyOn(categoryResolver, "resolveCategoryConfig").mockImplementation(
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(category) => ({ model: `${category}/default-model` } as CategoryConfig)
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);
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logSpy = spyOn(shared, "log").mockImplementation(() => {});
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});
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afterEach(() => {
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fetchAvailableModelsSpy.mockRestore();
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readConnectedProvidersCacheSpy.mockRestore();
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resolveCategoryConfigSpy.mockRestore();
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logSpy.mockRestore();
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});
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describe("#given no explicit Prometheus model configured", () => {
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describe("#when currentModel is NOT in Prometheus fallback chain", () => {
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test("falls through to fallback chain instead of using currentModel as override", async () => {
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// given - currentModel is a model NOT in Prometheus fallback chain
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// Prometheus chain: claude-opus-4-6, gpt-5.4, glm-5, gemini-3.1-pro
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const currentModel = "some-provider/gpt-5.3-codex";
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: undefined,
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userCategories: undefined,
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currentModel,
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});
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// then - should NOT have resolved via override (currentModel)
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// The model should fall through to fallback chain
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const lastLogCall = logSpy.mock.calls[logSpy.mock.calls.length - 1];
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const lastLogMessage = lastLogCall?.[0] as string;
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expect(lastLogMessage).not.toContain("UI selection");
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expect(lastLogMessage).not.toContain("config override");
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});
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});
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describe("#when currentModel IS in Prometheus fallback chain", () => {
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test("preserves currentModel as uiSelectedModel (override)", async () => {
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// given - currentModel matches a Prometheus fallback chain entry
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const currentModel = "anthropic/claude-opus-4-6";
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: undefined,
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userCategories: undefined,
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currentModel,
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});
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// then - should have resolved via UI selection (currentModel as override)
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const uiSelectionLog = logSpy.mock.calls.find(
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(call) => (call[0] as string).includes("UI selection")
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);
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expect(uiSelectionLog).toBeDefined();
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expect(uiSelectionLog?.[1]).toEqual({ model: "claude-opus-4-6" });
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});
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test("matches gpt-5.4 from fallback chain", async () => {
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// given
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const currentModel = "openai/gpt-5.4";
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: undefined,
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userCategories: undefined,
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currentModel,
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});
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// then
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const uiSelectionLog = logSpy.mock.calls.find(
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(call) => (call[0] as string).includes("UI selection")
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);
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expect(uiSelectionLog).toBeDefined();
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expect(uiSelectionLog?.[1]).toEqual({ model: "gpt-5.4" });
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});
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test("matches glm-5 from fallback chain", async () => {
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// given
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const currentModel = "opencode-go/glm-5";
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: undefined,
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userCategories: undefined,
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currentModel,
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});
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// then
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const uiSelectionLog = logSpy.mock.calls.find(
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(call) => (call[0] as string).includes("UI selection")
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);
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expect(uiSelectionLog).toBeDefined();
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expect(uiSelectionLog?.[1]).toEqual({ model: "glm-5" });
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});
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test("matches gemini-3.1-pro from fallback chain", async () => {
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// given
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const currentModel = "google/gemini-3.1-pro";
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: undefined,
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userCategories: undefined,
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currentModel,
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});
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// then
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const uiSelectionLog = logSpy.mock.calls.find(
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(call) => (call[0] as string).includes("UI selection")
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);
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expect(uiSelectionLog).toBeDefined();
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expect(uiSelectionLog?.[1]).toEqual({ model: "gemini-3.1-pro" });
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});
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});
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});
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describe("#given explicit Prometheus model configured via plugin override", () => {
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test("explicit config wins over currentModel and fallback chain", async () => {
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// given
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const currentModel = "anthropic/claude-opus-4-6";
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const explicitModel = "custom-provider/custom-model";
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: { model: explicitModel },
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userCategories: undefined,
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currentModel,
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});
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// then - should resolve via config override, not UI selection
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const configOverrideLog = logSpy.mock.calls.find(
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(call) => (call[0] as string).includes("config override")
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);
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expect(configOverrideLog).toBeDefined();
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expect(configOverrideLog?.[1]).toEqual({ model: explicitModel });
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});
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});
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describe("#given category with model configured", () => {
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test("category model wins when no explicit override", async () => {
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// given
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const currentModel = "anthropic/claude-opus-4-6";
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const categoryModel = "category-provider/category-model";
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resolveCategoryConfigSpy.mockReturnValue({
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model: categoryModel,
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} as CategoryConfig);
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: { category: "test-category" },
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userCategories: { "test-category": { model: categoryModel } },
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currentModel,
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});
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// then - should resolve via category default
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const categoryDefaultLog = logSpy.mock.calls.find(
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(call) => (call[0] as string).includes("category default")
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);
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expect(categoryDefaultLog).toBeDefined();
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});
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test("explicit model override wins over category model", async () => {
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// given
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const categoryModel = "category-provider/category-model";
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const explicitModel = "explicit-provider/explicit-model";
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resolveCategoryConfigSpy.mockReturnValue({
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model: categoryModel,
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} as CategoryConfig);
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: {
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category: "test-category",
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model: explicitModel,
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},
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userCategories: { "test-category": { model: categoryModel } },
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currentModel: undefined,
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});
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// then - should resolve via config override, not category default
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const configOverrideLog = logSpy.mock.calls.find(
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(call) => (call[0] as string).includes("config override")
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);
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expect(configOverrideLog).toBeDefined();
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expect(configOverrideLog?.[1]).toEqual({ model: explicitModel });
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});
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});
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describe("#given no currentModel and no explicit config", () => {
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test("falls through to fallback chain", async () => {
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// given - no currentModel, no explicit config
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readConnectedProvidersCacheSpy.mockReturnValue(["anthropic"]);
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// when
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await buildPrometheusAgentConfig({
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configAgentPlan: undefined,
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pluginPrometheusOverride: undefined,
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userCategories: undefined,
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currentModel: undefined,
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});
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// then - should resolve via fallback chain
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const fallbackChainLog = logSpy.mock.calls.find(
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(call) => (call[0] as string).includes("fallback chain")
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);
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expect(fallbackChainLog).toBeDefined();
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});
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});
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});
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@@ -2,6 +2,7 @@ import type { CategoryConfig } from "../config/schema";
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import { PROMETHEUS_PERMISSION, getPrometheusPrompt } from "../agents/prometheus";
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import { resolvePromptAppend } from "../agents/builtin-agents/resolve-file-uri";
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import { AGENT_MODEL_REQUIREMENTS } from "../shared/model-requirements";
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import type { FallbackEntry } from "../shared/model-requirements";
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import {
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fetchAvailableModels,
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readConnectedProvidersCache,
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@@ -22,6 +23,20 @@ type PrometheusOverride = Record<string, unknown> & {
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prompt_append?: string;
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};
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function isModelInFallbackChain(
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model: string | undefined,
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fallbackChain: FallbackEntry[] | undefined,
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): boolean {
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if (!model || !fallbackChain || fallbackChain.length === 0) {
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return false;
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}
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const modelParts = model.split("/");
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const modelName = modelParts.length >= 2 ? modelParts.slice(1).join("/") : model;
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return fallbackChain.some((entry) => entry.model === modelName);
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}
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export async function buildPrometheusAgentConfig(params: {
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configAgentPlan: Record<string, unknown> | undefined;
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pluginPrometheusOverride: PrometheusOverride | undefined;
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@@ -42,9 +57,18 @@ export async function buildPrometheusAgentConfig(params: {
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const configuredPrometheusModel =
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params.pluginPrometheusOverride?.model ?? categoryConfig?.model;
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const shouldUseCurrentModel = isModelInFallbackChain(
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params.currentModel,
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requirement?.fallbackChain,
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);
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const modelResolution = resolveModelPipeline({
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intent: {
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uiSelectedModel: configuredPrometheusModel ? undefined : params.currentModel,
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uiSelectedModel: configuredPrometheusModel
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? undefined
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: shouldUseCurrentModel
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? params.currentModel
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: undefined,
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userModel: params.pluginPrometheusOverride?.model,
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categoryDefaultModel: categoryConfig?.model,
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},
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