diff --git a/actions/setup/js/fixtures/awf-reflect-pi-routed-39325995892.json b/actions/setup/js/fixtures/awf-reflect-pi-routed-39325995892.json
new file mode 100644
index 00000000000..7e98abcf0f1
--- /dev/null
+++ b/actions/setup/js/fixtures/awf-reflect-pi-routed-39325995892.json
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+        "endpoints": {
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+            "patterns": ["gpt-6-astra*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Newest flagship model (Trusted Access Program rollout). Supports Chat Completions and Responses APIs."
+          },
+          {
+            "family": "gpt-6-sol",
+            "patterns": ["gpt-6-sol*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "GPT-6 tier balancing intelligence and cost. Supports both Chat Completions and Responses APIs per official model page."
+          },
+          {
+            "family": "gpt-6.1-sol",
+            "patterns": ["gpt-6.1-sol*"],
+            "endpoints": ["chat_completions", "responses"],
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+          },
+          {
+            "family": "gpt-6-luna",
+            "patterns": ["gpt-6-luna*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "GPT-6 tier for cost-sensitive, high-volume use. Supports both Chat Completions and Responses APIs per official model page."
+          },
+          {
+            "family": "gpt-daybreak",
+            "patterns": ["gpt-daybreak-blue-latest", "gpt-daybreak-red-latest"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only (ResponsesModel-only Literal). Experimental/preview aliases not present in ChatModel."
+          },
+          {
+            "family": "gpt-rosalind-research",
+            "patterns": ["gpt-rosalind-research*"],
+            "endpoints": ["responses"],
+            "notes": "Life sciences reasoning model, Trusted Access Program (approved organizations only). Responses API only, consistent with other restricted-access specialized models (gpt-daybreak-*, gpt-5.6-cyber). Billing begins October 5, 2026."
+          },
+          {
+            "family": "gpt-5.6-cyber",
+            "patterns": ["gpt-5.6-cyber*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only (ResponsesModel-only Literal, not in ChatModel). More specific than gpt-5.6* pattern below."
+          },
+          {
+            "family": "gpt-5.6",
+            "patterns": ["gpt-5.6*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Supports both endpoints. Includes gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna per OpenAI SDK ChatModel. gpt-5.6-cyber is responses-only (see separate entry above)."
+          },
+          {
+            "family": "gpt-5.5-pro",
+            "patterns": ["gpt-5.5-pro", "gpt-5.5-pro-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only (ResponsesOnlyModel per OpenAI OpenAPI spec). More specific than gpt-5.5* pattern below. Includes dated variants like gpt-5.5-pro-2026-04-23."
+          },
+          {
+            "family": "gpt-5.5",
+            "patterns": ["gpt-5.5*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Supports both endpoints. Listed on the official GPT-5.5 model page. gpt-5.5-pro is responses-only (see separate entry above)."
+          },
+          {
+            "family": "gpt-5.4",
+            "patterns": ["gpt-5.4*"],
+            "routingPatterns": ["gpt-5.4", "gpt-5.4-2026-03-05"],
+            "endpoints": ["chat_completions", "responses"],
+            "routing": {
+              "reasoningEfforts": ["none", "low", "medium", "high", "xhigh"],
+              "contextWindowTokens": 1050000
+            },
+            "notes": "Supports both endpoints on OpenAI. GPT-5.4 routing metadata is exact-model only; mini/nano variants need separately verified data. The model page lists none, low, medium, high, and xhigh reasoning effort and a 1,050,000-token context window."
+          },
+          {
+            "family": "gpt-5.3-codex",
+            "patterns": ["gpt-5.3-codex", "gpt-5.3-codex-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only per official model page (developers.openai.com/api/docs/models/gpt-5.3-codex). More specific than gpt-5.3* pattern below."
+          },
+          {
+            "family": "gpt-5.3",
+            "patterns": ["gpt-5.3*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Supports both endpoints. Only gpt-5.3-chat-latest confirmed for both endpoints; gpt-5.3-codex is responses-only (see separate entry above). No bare gpt-5.3 base model exists."
+          },
+          {
+            "family": "gpt-5.2-codex",
+            "patterns": ["gpt-5.2-codex", "gpt-5.2-codex-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only per official model page (developers.openai.com/api/docs/models/gpt-5.2-codex). More specific than gpt-5.2* pattern below."
+          },
+          {
+            "family": "gpt-5.2-pro",
+            "patterns": ["gpt-5.2-pro", "gpt-5.2-pro-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only per official model page (developers.openai.com/api/docs/models/gpt-5.2-pro). More specific than gpt-5.2* pattern below."
+          },
+          {
+            "family": "gpt-5.2",
+            "patterns": ["gpt-5.2*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Supports both endpoints. gpt-5.2-pro and gpt-5.2-codex are responses-only (see separate entries above)."
+          },
+          {
+            "family": "gpt-5.1-codex-max",
+            "patterns": ["gpt-5.1-codex-max"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only (ResponsesOnlyModel)."
+          },
+          {
+            "family": "gpt-5.1-codex",
+            "patterns": ["gpt-5.1-codex", "gpt-5.1-codex-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only per official model pages (developers.openai.com/api/docs/models/gpt-5.1-codex, /gpt-5.1-codex-mini). More specific than gpt-5.1* pattern below. gpt-5.1-codex-max is covered by a dedicated entry above."
+          },
+          {
+            "family": "gpt-5.1",
+            "patterns": ["gpt-5.1*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Supports both endpoints for gpt-5.1 and gpt-5.1-mini. gpt-5.1-codex, gpt-5.1-codex-mini, and gpt-5.1-codex-max are responses-only (see separate entries above)."
+          },
+          {
+            "family": "gpt-5-codex/pro",
+            "patterns": ["gpt-5-codex", "gpt-5-pro", "gpt-5-pro-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only for gpt-5-codex and gpt-5-pro (ResponsesOnlyModel). Includes dated variants like gpt-5-pro-2025-10-06."
+          },
+          {
+            "family": "gpt-5",
+            "patterns": ["gpt-5", "gpt-5-*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Supports both endpoints for gpt-5, gpt-5-mini, gpt-5-nano."
+          },
+          {
+            "family": "o4-mini-deep-research",
+            "patterns": ["o4-mini-deep-research", "o4-mini-deep-research-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only (ResponsesOnlyModel). Includes dated variants like o4-mini-deep-research-2025-06-26."
+          },
+          {
+            "family": "o4",
+            "patterns": ["o4*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Reasoning model. o4-mini supports both endpoints (ModelIdsShared)."
+          },
+          {
+            "family": "o3-pro/deep-research",
+            "patterns": ["o3-pro", "o3-pro-*", "o3-deep-research", "o3-deep-research-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only. o3-pro and o3-deep-research are in ResponsesModel but not ChatModel."
+          },
+          {
+            "family": "o3",
+            "patterns": ["o3*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Reasoning model. o3, o3-mini support both endpoints. o3-pro/deep-research use responses only (covered by separate entry above)."
+          },
+          {
+            "family": "o1-pro",
+            "patterns": ["o1-pro", "o1-pro-*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only. o1-pro is in ResponsesModel but not ChatModel."
+          },
+          {
+            "family": "o1-mini/preview",
+            "patterns": ["o1-mini*", "o1-preview*"],
+            "endpoints": ["chat_completions"],
+            "notes": "Chat Completions API only per official model pages (developers.openai.com/api/docs/models/o1-mini, /o1-preview). Not available via Responses API. More specific than o1* pattern below."
+          },
+          {
+            "family": "o1",
+            "patterns": ["o1*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Reasoning model. o1 (base) supports both endpoints. o1-pro is responses-only and o1-mini/o1-preview are chat_completions-only (see separate entries above)."
+          },
+          {
+            "family": "computer-use-preview",
+            "patterns": ["computer-use-preview*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only. Specialized model for computer use tasks."
+          },
+          {
+            "family": "codex-mini",
+            "patterns": ["codex-mini*"],
+            "endpoints": ["responses"],
+            "notes": "Responses API only per official model page (developers.openai.com/api/docs/models/codex-mini-latest). Chat Completions is marked unsupported on the model page."
+          },
+          {
+            "family": "chatgpt-4o-latest",
+            "patterns": ["chatgpt-4o-latest"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Rolling alias for the latest ChatGPT-optimized GPT-4o model. Supports both endpoints (ModelIdsShared). Not matched by gpt-4o* pattern due to chatgpt- prefix."
+          },
+          {
+            "family": "gpt-4o",
+            "patterns": ["gpt-4o*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Multimodal. Supports both endpoints. Includes audio and search preview variants."
+          },
+          {
+            "family": "gpt-4.1",
+            "patterns": ["gpt-4.1*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Supports both endpoints. Includes gpt-4.1-mini, gpt-4.1-nano."
+          },
+          {
+            "family": "gpt-4.5",
+            "patterns": ["gpt-4.5*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Preview model. Now supports both endpoints per official model page (developers.openai.com/api/docs/models/gpt-4.5-preview); Responses API support was added since the previous mapping update."
+          },
+          {
+            "family": "gpt-4-turbo",
+            "patterns": ["gpt-4-turbo*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Legacy. In ModelIdsShared per OpenAI spec v2.3.0; supports both endpoints."
+          },
+          {
+            "family": "gpt-4",
+            "patterns": ["gpt-4", "gpt-4-*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Legacy. In ModelIdsShared per OpenAI spec v2.3.0; supports both endpoints."
+          },
+          {
+            "family": "gpt-3.5-turbo",
+            "patterns": ["gpt-3.5-turbo*"],
+            "endpoints": ["chat_completions", "responses"],
+            "notes": "Legacy. In ModelIdsShared per OpenAI spec v2.3.0; supports both endpoints. Deprecated."
+          }
+        ]
+      },
+      "anthropic": {
+        "endpoints": {
+          "messages": {
+            "path": "/v1/messages",
+            "description": "Unified Messages API for all Claude models. Supports tool use, streaming, extended thinking, and vision."
+          }
+        },
+        "models": [
+          {
+            "family": "claude-opus-5",
+            "patterns": ["claude-opus-5*"],
+            "routingPatterns": ["claude-opus-5-5", "claude-opus-5"],
+            "endpoints": ["messages"],
+            "routing": {
+              "reasoningEfforts": ["low", "medium", "high", "max"],
+              "contextWindowTokens": 1000000
+            },
+            "notes": "Flagship Opus generation 5 models with verified 1M-token context windows and the Anthropic effort parameter."
+          },
+          {
+            "family": "claude-fable-5",
+            "patterns": ["claude-fable-5*"],
+            "routingPatterns": ["claude-fable-5-1", "claude-fable-5"],
+            "endpoints": ["messages"],
+            "routing": {
+              "reasoningEfforts": ["low", "medium", "high", "max"],
+              "contextWindowTokens": 1000000
+            },
+            "notes": "Latest flagship family with verified 1M-token context windows and the Anthropic effort parameter."
+          },
+          {
+            "family": "claude-mythos-5",
+            "patterns": ["claude-mythos-5*", "claude-mythos-preview*"],
+            "routingPatterns": ["claude-mythos-5-1", "claude-mythos-5", "claude-mythos-preview*"],
+            "endpoints": ["messages"],
+            "routing": {
+              "reasoningEfforts": ["low", "medium", "high", "max"],
+              "contextWindowTokens": 1000000
+            },
+            "notes": "Specialized models, invitation-only, with verified 1M-token context windows and the Anthropic effort parameter."
+          },
+          {
+            "family": "claude-sonnet-5",
+            "patterns": ["claude-sonnet-5*"],
+            "routingPatterns": ["claude-sonnet-5-5", "claude-sonnet-5"],
+            "endpoints": ["messages"],
+            "routing": {
+              "reasoningEfforts": ["low", "medium", "high", "max"],
+              "contextWindowTokens": 1000000
+            },
+            "notes": "Best combination of speed and intelligence with verified 1M-token context windows and the Anthropic effort parameter."
+          },
+          {
+            "family": "claude-opus-4",
+            "patterns": ["claude-opus-4*"],
+            "routingPatterns": ["claude-opus-4-8", "claude-opus-4-7", "claude-opus-4-6"],
+            "endpoints": ["messages"],
+            "routing": {
+              "reasoningEfforts": ["low", "medium", "high", "max"],
+              "contextWindowTokens": 1000000
+            },
+            "notes": "Opus 4.6 and newer models have verified 1M-token context windows and support the Anthropic effort parameter."
+          },
+          {
+            "family": "claude-sonnet-4",
+            "patterns": ["claude-sonnet-4*"],
+            "routingPatterns": ["claude-sonnet-4-6"],
+            "endpoints": ["messages"],
+            "routing": {
+              "reasoningEfforts": ["low", "medium", "high", "max"],
+              "contextWindowTokens": 1000000
+            },
+            "notes": "Sonnet 4.6 has a verified 1M-token context window and supports the Anthropic effort parameter."
+          },
+          {
+            "family": "claude-haiku-5",
+            "patterns": ["claude-haiku-5*"],
+            "endpoints": ["messages"],
+            "notes": "Fast/cheap Haiku generation 5 (claude-haiku-5-5). 1M token context window per official models overview; effort levels not verified, so no routing metadata."
+          },
+          {
+            "family": "claude-haiku-4",
+            "patterns": ["claude-haiku-4*"],
+            "endpoints": ["messages"],
+            "notes": "Includes claude-haiku-4-5. Fast/cheap. 200K token context."
+          },
+          {
+            "family": "claude-3.5-sonnet",
+            "patterns": ["claude-3-5-sonnet*", "claude-3.5-sonnet*"],
+            "endpoints": ["messages"],
+            "notes": "Previous generation. 200K token context."
+          },
+          {
+            "family": "claude-3.5-haiku",
+            "patterns": ["claude-3-5-haiku*", "claude-3.5-haiku*"],
+            "endpoints": ["messages"],
+            "notes": "Previous generation fast model."
+          },
+          {
+            "family": "claude-3.7-sonnet",
+            "patterns": ["claude-3-7-sonnet*", "claude-3.7-sonnet*"],
+            "endpoints": ["messages"],
+            "notes": "Previous generation extended thinking model. 200K token context."
+          },
+          {
+            "family": "claude-3-opus",
+            "patterns": ["claude-3-opus*"],
+            "endpoints": ["messages"],
+            "notes": "Previous generation. 200K token context."
+          }
+        ]
+      }
+    },
+    "error": null
+  },
+  "routing": {
+    "status": "selected",
+    "selection": {
+      "provider": "copilot",
+      "model": "github-copilot/gpt-5.6-luna",
+      "wire_model": "gpt-5.6-luna",
+      "effort": "max",
+      "endpoint": "/responses"
+    }
+  }
+}
diff --git a/actions/setup/js/pi_models_json.cjs b/actions/setup/js/pi_models_json.cjs
index d91406a3fea..6f3017a5b13 100644
--- a/actions/setup/js/pi_models_json.cjs
+++ b/actions/setup/js/pi_models_json.cjs
@@ -519,7 +519,8 @@ async function main(options = {}) {
     const runtime = await sdk.ModelRuntime.create({ modelsPath: null });
     // Sub-agent aliases resolve against the live /reflect catalogue only (never Pi's static
     // model list); an incomplete catalogue is refetched once before failing.
-    const prepare = (/** @type {any} */ data) => preparePiSubagents({ agentDir, sdk, provider: nativeProvider, reflectData: data, gateway: true, parentModel: `${nativeProvider}/${modelId}`, logger });
+    const parentModel = `${nativeProvider}/${modelId}`;
+    const prepare = (/** @type {any} */ data) => preparePiSubagents({ agentDir, sdk, provider: nativeProvider, reflectData: data, gateway: true, parentModel, logger });
     let agents;
     try {
       agents = prepare(reflectData);
@@ -535,7 +536,18 @@ async function main(options = {}) {
     for (const agent of agents) {
       if (seen.has(agent.modelId)) continue;
       seen.add(agent.modelId);
-      validatePiModelAvailability({ provider, modelId: agent.modelId, configuredModel: agent.declaredModel || agent.modelId, reflectData, logger });
+      try {
+        validatePiModelAvailability({ provider, modelId: agent.modelId, configuredModel: agent.requested, reflectData, logger });
+      } catch (error) {
+        if (error instanceof ModelAliasResolutionError) {
+          // Replace the earlier "exact"/"resolved" record for every role sharing the unavailable model.
+          for (const failed of agents) {
+            if (failed.modelId !== agent.modelId) continue;
+            recordModelResolution({ engine: "pi", role: failed.name, configured_model: failed.requested, resolved_model: null, provider: error.provider || null, status: "failed", cause: error.reason });
+          }
+        }
+        throw error;
+      }
       const catalogModel = runtime.getModel(nativeProvider, agent.modelId);
       const childApi = resolvePiApiForModel({ provider, modelId: agent.modelId, model: catalogModel, modelsJson, logger });
       const childMetadata = {};
diff --git a/actions/setup/js/pi_models_json.test.cjs b/actions/setup/js/pi_models_json.test.cjs
index 15eea51cbc6..13b8b844b6f 100644
--- a/actions/setup/js/pi_models_json.test.cjs
+++ b/actions/setup/js/pi_models_json.test.cjs
@@ -719,6 +719,99 @@ describe("pi_models_json.cjs", () => {
       expect(records()).toEqual([{ engine: "pi", role: "main", configured_model: "copilot/claude-opus-5", resolved_model: null, provider: "copilot", status: "failed", cause: "model_unavailable" }]);
     });
 
+    // Recorded /reflect from Smoke Pi Routed run https://github.com/github/gh-aw/actions/runs/39325995892
+    // (agent artifact, sandbox/firewall/awf-reflect.json): models_fetch_complete: true and 36 Copilot
+    // models including claude-haiku-4.5 and gpt-5.6-luna, but not gpt-5.4-mini.
+    describe("sub-agent model availability (recorded /reflect from run 39325995892)", () => {
+      const piRoutedReflect = () => JSON.parse(fs.readFileSync(path.join(__dirname, "fixtures/awf-reflect-pi-routed-39325995892.json"), "utf8"));
+      const runWithSubagents = (subagents, routing = false, parentModel = "copilot/gpt-5.6-luna") => {
+        configure(parentModel, {});
+        if (routing) process.env.GH_AW_MODEL_ROUTING = "1";
+        const agentsDir = path.join(process.env.GH_AW_PI_STAGING_DIR, "agents");
+        fs.mkdirSync(agentsDir, { recursive: true });
+        for (const [name, model] of subagents) fs.writeFileSync(path.join(agentsDir, `${name}.md`), JSON.stringify({ name, model }));
+        // Directory order is filesystem-dependent; pin it to the declaration order.
+        const order = subagents.map(([name]) => `${name}.md`);
+        const readdirSync = fs.readdirSync;
+        vi.spyOn(fs, "readdirSync").mockImplementation((dir, ...rest) => {
+          const entries = readdirSync(dir, ...rest);
+          return path.resolve(String(dir)) === path.resolve(tmpDir, "agents") ? entries.sort((a, b) => order.indexOf(a.name) - order.indexOf(b.name)) : entries;
+        });
+        const catalog = [
+          { provider: "github-copilot", id: "gpt-5.6-luna", api: "openai-responses" },
+          { provider: "github-copilot", id: "claude-haiku-4.5", api: "anthropic-messages" },
+        ];
+        const sdk = {
+          parseFrontmatter: content => {
+            const { name, model } = JSON.parse(content);
+            return { frontmatter: { name, description: `Report ${name}`, model }, body: name };
+          },
+          ModelRuntime: { create: async () => ({ getModels: () => catalog, getModel: (_provider, id) => catalog.find(model => model.id === id) }) },
+        };
+        return run([piRoutedReflect()], { loadSDK: async () => sdk }).promise;
+      };
+      const subagentRecords = () => records().filter(record => record.role !== "main");
+      const failedMini = role => ({ engine: "pi", role, configured_model: "copilot/gpt-5.4-mini", resolved_model: null, provider: "copilot", status: "failed", cause: "model_unavailable" });
+      const exactHaiku = role => ({ engine: "pi", role, configured_model: "copilot/claude-haiku-4.5", resolved_model: "claude-haiku-4.5", provider: "copilot", status: "exact", cause: null });
+
+      it.each([false, true])("records failed model_unavailable for a sub-agent pinned to a model missing from /reflect (run 39325995892) (routing=%s)", async routing => {
+        const error = await runWithSubagents([["mini-whoami", "copilot/gpt-5.4-mini"]], routing).catch(err => err);
+        expect(error.name).toBe("ModelAliasResolutionError");
+        expect(error.reason).toBe("model_unavailable");
+        expect(error.message).toMatch(/^Pi model "gpt-5\.4-mini" is not advertised by the configured copilot proxy endpoint/);
+        expect(fs.existsSync(path.join(tmpDir, "models.json"))).toBe(false);
+        expect(subagentRecords()).toEqual([failedMini("mini-whoami")]);
+      });
+
+      it("keeps exact resolution for a sub-agent on a live model", async () => {
+        await runWithSubagents([["haiku-whoami", "copilot/claude-haiku-4.5"]]);
+        expect(fs.existsSync(path.join(tmpDir, "models.json"))).toBe(true);
+        expect(subagentRecords()).toEqual([exactHaiku("haiku-whoami")]);
+      });
+
+      it("keeps the configured parent model for a sub-agent with no model declaration", async () => {
+        await runWithSubagents([["inherited-whoami"]]);
+        expect(subagentRecords()).toEqual([{ engine: "pi", role: "inherited-whoami", configured_model: "github-copilot/gpt-5.6-luna", resolved_model: "gpt-5.6-luna", provider: "copilot", status: "exact", cause: null }]);
+      });
+
+      it("rejects an unavailable inherited parent model before preparing sub-agents", async () => {
+        const error = await runWithSubagents([["inherited-whoami"]], false, "copilot/gpt-5.4-mini").catch(err => err);
+        expect(error).toMatchObject({ name: "ModelAliasResolutionError", reason: "model_unavailable" });
+        expect(records()).toEqual([failedMini("main")]);
+        expect(subagentRecords()).toEqual([]);
+        expect(fs.existsSync(path.join(tmpDir, "subagents.json"))).toBe(false);
+        expect(fs.existsSync(path.join(tmpDir, "models.json"))).toBe(false);
+      });
+
+      it.each([
+        ["haiku-whoami", "mini-whoami"],
+        ["mini-whoami", "haiku-whoami"],
+      ])("marks only the unavailable sub-agent failed when one of two sub-agents is live (%s, %s)", async (first, second) => {
+        const live = first.includes("haiku") ? first : second;
+        const dead = first.includes("mini") ? first : second;
+        const error = await runWithSubagents([
+          [first, first.includes("haiku") ? "copilot/claude-haiku-4.5" : "copilot/gpt-5.4-mini"],
+          [second, second.includes("haiku") ? "copilot/claude-haiku-4.5" : "copilot/gpt-5.4-mini"],
+        ]).catch(err => err);
+        expect(error.reason).toBe("model_unavailable");
+        expect(fs.existsSync(path.join(tmpDir, "models.json"))).toBe(false);
+        expect(JSON.parse(fs.readFileSync(path.join(tmpDir, "subagents.json"), "utf8")).map(agent => agent.name)).toEqual([first, second]);
+        expect(stderrOutput.join("").includes("model availability confirmed (provider=copilot, model=claude-haiku-4.5)")).toBe(first === live);
+        const byRole = Object.fromEntries(subagentRecords().map(record => [record.role, record]));
+        expect(byRole).toEqual({ [live]: exactHaiku(live), [dead]: failedMini(dead) });
+      });
+
+      it("marks every sub-agent sharing the unavailable model failed", async () => {
+        const error = await runWithSubagents([
+          ["mini-one", "copilot/gpt-5.4-mini"],
+          ["mini-two", "copilot/gpt-5.4-mini"],
+        ]).catch(err => err);
+        expect(error.reason).toBe("model_unavailable");
+        const byRole = Object.fromEntries(subagentRecords().map(record => [record.role, record]));
+        expect(byRole).toEqual({ "mini-one": failedMini("mini-one"), "mini-two": failedMini("mini-two") });
+      });
+    });
+
     // gpt-5-mini is both a built-in alias and a live id in the recorded /reflect; the
     // "absent" case removes it from a copy of the recording.
     it("a live exact id wins over an alias with the same name", async () => {
diff --git a/actions/setup/js/pi_subagent_config.cjs b/actions/setup/js/pi_subagent_config.cjs
index 42c5a3a7287..aa90d019d09 100644
--- a/actions/setup/js/pi_subagent_config.cjs
+++ b/actions/setup/js/pi_subagent_config.cjs
@@ -85,7 +85,7 @@ function preparePiSubagents(options) {
     verifyPiThinkingEffort(effort);
     logger(`sub-agent ${agent.name}: requested=${requested} resolved=${provider}/${modelId}`);
     recordModelResolution({ engine: "pi", role: agent.name, configured_model: requested, resolved_model: modelId, provider: resolution.provider || null, status: resolution.status, cause: null }, env);
-    return { ...agent, modelId, model: `${gateway ? "aw-gateway" : provider}/${modelId}`, ...(effort ? { thinking: effort === "none" ? "off" : effort } : {}) };
+    return { ...agent, requested, modelId, model: `${gateway ? "aw-gateway" : provider}/${modelId}`, ...(effort ? { thinking: effort === "none" ? "off" : effort } : {}) };
   });
   writeSecureOutput(path.join(agentDir, "subagents.json"), JSON.stringify(agents, null, 2));
   return agents;
diff --git a/actions/setup/js/pi_subagent_config.test.cjs b/actions/setup/js/pi_subagent_config.test.cjs
index d40cd410c47..fdc1247a7de 100644
--- a/actions/setup/js/pi_subagent_config.test.cjs
+++ b/actions/setup/js/pi_subagent_config.test.cjs
@@ -29,18 +29,21 @@ const prepare = overrides => preparePiSubagents({ agentDir: dir, sdk, provider:
 
 describe("Pi sub-agent model resolution", () => {
   it("derives name from the marker filename and qualifies bare models through the gateway", () => {
-    expect(prepare()).toEqual([expect.objectContaining({ name: "reader", model: "aw-gateway/claude-haiku-4.5", tools: ["read"] })]);
+    expect(prepare()).toEqual([expect.objectContaining({ name: "reader", requested: "claude-haiku-4.5", model: "aw-gateway/claude-haiku-4.5", tools: ["read"] })]);
     expect(JSON.parse(fs.readFileSync(path.join(dir, "subagents.json"), "utf8"))[0].declaredModel).toBe("claude-haiku-4.5");
   });
 
   it.each(["small", "recursive"])("resolves alias %s only on the parent's provider", model => {
     frontmatter.model = model;
-    expect(prepare()[0].model).toBe("aw-gateway/claude-haiku-4.5");
+    expect(prepare()[0]).toMatchObject({ requested: model, model: "aw-gateway/claude-haiku-4.5" });
   });
 
   it("inherits an unspecified model and supports native execution", () => {
     delete frontmatter.model;
-    expect(prepare({ gateway: false })[0].model).toBe("github-copilot/gpt-5.6-luna");
+    const [agent] = prepare({ gateway: false });
+    expect(agent).toMatchObject({ requested: "github-copilot/gpt-5.6-luna", model: "github-copilot/gpt-5.6-luna" });
+    expect(agent.declaredModel).toBeUndefined();
+    expect(JSON.parse(fs.readFileSync(path.join(dir, "agent/model-resolution.json"), "utf8"))[0].configured_model).toBe(agent.requested);
   });
 
   it.each(["none", "minimal", "low", "medium", "high", "xhigh", "max"])("translates %s effort into Pi thinking settings", effort => {