diff --git a/actions/setup/js/create_issue.cjs b/actions/setup/js/create_issue.cjs
index 385579ca33e..7daf568e257 100644
--- a/actions/setup/js/create_issue.cjs
+++ b/actions/setup/js/create_issue.cjs
@@ -778,7 +778,13 @@ async function main(config = {}) {
     const bodyLines = processedBody.split("\n");
 
     if (!title) {
-      title = message.body ?? "Agent Output";
+      // Use the first non-empty line of the body as the title fallback rather than
+      // the entire body, so the title stays concise and the body remains intact.
+      const firstBodyLine = (message.body ?? "")
+        .split("\n")
+        .map(l => l.replace(/^#+\s*/, "").trim())
+        .find(l => l.length > 0);
+      title = firstBodyLine || "Agent Output";
     }
 
     // Sanitize title for Unicode security and remove any duplicate prefixes
diff --git a/actions/setup/js/create_issue.test.cjs b/actions/setup/js/create_issue.test.cjs
index 3d20ea4214a..236b7c7407b 100644
--- a/actions/setup/js/create_issue.test.cjs
+++ b/actions/setup/js/create_issue.test.cjs
@@ -138,6 +138,20 @@ describe("create_issue", () => {
       );
     });
 
+    it("should use the first meaningful body line as title when title is missing", async () => {
+      const handler = await main({});
+      const body = "\n\n## Incident Summary\n\nFull details line 1\nFull details line 2";
+      const result = await handler({ body });
+
+      expect(result.success).toBe(true);
+      expect(mockGithub.rest.issues.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          title: "Incident Summary",
+          body: expect.stringContaining("Full details line 1\nFull details line 2"),
+        })
+      );
+    });
+
     it("should use 'Agent Output' as title when both title and body are missing", async () => {
       const handler = await main({});
       const result = await handler({});
diff --git a/actions/setup/js/intent_probe.cjs b/actions/setup/js/intent_probe.cjs
index fdef70a6949..a3c36faaeea 100644
--- a/actions/setup/js/intent_probe.cjs
+++ b/actions/setup/js/intent_probe.cjs
@@ -38,7 +38,12 @@ function resolveIssueTitleForValidation(entry) {
     return entry.title;
   }
   if (typeof entry.body === "string" && entry.body.trim()) {
-    return entry.body;
+    // Mirror create_issue's fallback: use the first non-empty line of the body.
+    const firstBodyLine = entry.body
+      .split("\n")
+      .map(l => l.replace(/^#+\s*/, "").trim())
+      .find(l => l.length > 0);
+    if (firstBodyLine) return firstBodyLine;
   }
   // Mirror create_issue's own fallback so probe validation sees the same
   // effective title the handler would ultimately use when both fields are absent.
diff --git a/actions/setup/js/mcp_scripts_mcp_server_http.test.cjs b/actions/setup/js/mcp_scripts_mcp_server_http.test.cjs
index 7e8340fbcf5..5b9e9a171e7 100644
--- a/actions/setup/js/mcp_scripts_mcp_server_http.test.cjs
+++ b/actions/setup/js/mcp_scripts_mcp_server_http.test.cjs
@@ -40,7 +40,12 @@ describe("mcp_scripts_mcp_server_http.cjs integration", () => {
         serverName: "http-integration-test-server",
         version: "1.0.0",
         tools: [
-          { name: "echo_tool", description: "Echoes the input message", inputSchema: { type: "object", properties: { message: { type: "string", description: "Message to echo" } }, required: ["message"] }, handler: "echo-handler.cjs" },
+          {
+            name: "echo_tool",
+            description: "Echoes the input message",
+            inputSchema: { type: "object", properties: { message: { type: "string", description: "Message to echo", minLength: 20 } }, required: ["message"] },
+            handler: "echo-handler.cjs",
+          },
         ],
       })
     ),
@@ -146,6 +151,15 @@ describe("mcp_scripts_mcp_server_http.cjs integration", () => {
         response = await makeRequest({ jsonrpc: "2.0", id: 4, method: "tools/call", params: { name: "echo_tool", arguments: {} } }, headers);
       (expect(response.status).toBe(200), expect(response.data.error).toBeDefined(), expect(response.data.error.message).toContain("not allowed"));
     }),
+    it("should enforce minLength from tool schema on HTTP calls", async () => {
+      const headers = sessionId ? { "Mcp-Session-Id": sessionId } : {},
+        response = await makeRequest({ jsonrpc: "2.0", id: 5, method: "tools/call", params: { name: "echo_tool", arguments: { message: "too short" } } }, headers);
+      (expect(response.status).toBe(200),
+        expect(response.data.error).toBeDefined(),
+        expect(response.data.error.code).toBe(-32602),
+        expect(response.data.error.message).toContain("Invalid arguments"),
+        expect(response.data.error.message).toContain("minimum 20 characters"));
+    }),
     afterAll(async () => {
       (serverProcess &&
         (serverProcess.kill("SIGTERM"),
diff --git a/actions/setup/js/safe_outputs_handlers.cjs b/actions/setup/js/safe_outputs_handlers.cjs
index eac9c107b6b..021cbf8fe9d 100644
--- a/actions/setup/js/safe_outputs_handlers.cjs
+++ b/actions/setup/js/safe_outputs_handlers.cjs
@@ -1697,7 +1697,13 @@ function createHandlers(server, appendSafeOutput, config = {}) {
 
     let resolvedTitle = entry.title?.trim() || "";
     if (!resolvedTitle) {
-      resolvedTitle = entry.body?.trim() || "Agent Output";
+      // Use the first non-empty line of the body as the title fallback rather than
+      // the entire body, so the title stays concise and the body remains intact.
+      const firstBodyLine = (entry.body || "")
+        .split("\n")
+        .map(l => l.replace(/^#+\s*/, "").trim())
+        .find(l => l.length > 0);
+      resolvedTitle = firstBodyLine || "Agent Output";
     }
     resolvedTitle = applyTitlePrefix(sanitizeTitle(resolvedTitle, createIssueTitlePrefix), createIssueTitlePrefix);
 
diff --git a/actions/setup/js/safe_outputs_handlers.test.cjs b/actions/setup/js/safe_outputs_handlers.test.cjs
index a30d63a6ab5..e1c94c28134 100644
--- a/actions/setup/js/safe_outputs_handlers.test.cjs
+++ b/actions/setup/js/safe_outputs_handlers.test.cjs
@@ -105,6 +105,8 @@ describe("safe_outputs_handlers", () => {
     it("resolves issue title using the create_issue fallback order", () => {
       expect(resolveIssueTitleForValidation({ title: "Real title", body: "Ignored body" })).toBe("Real title");
       expect(resolveIssueTitleForValidation({ body: "Body title" })).toBe("Body title");
+      expect(resolveIssueTitleForValidation({ body: "\n\n## Incident Summary\n\nBody details" })).toBe("Incident Summary");
+      expect(resolveIssueTitleForValidation({ body: "   \n\n  " })).toBe("Agent Output");
       expect(resolveIssueTitleForValidation({})).toBe("Agent Output");
     });
 
@@ -2305,6 +2307,40 @@ describe("safe_outputs_handlers", () => {
   });
 
   describe("createIssueHandler", () => {
+    it("should deduplicate against fallback title derived from first meaningful body line", () => {
+      const h = createHandlers(mockServer, mockAppendSafeOutput, {
+        create_issue: {
+          deduplicate_by_title: true,
+        },
+      });
+
+      const first = h.createIssueHandler({ body: "\n\n## Incident Summary\n\nBody A details" });
+      const second = h.createIssueHandler({ title: "Incident Summary", body: "Body B details" });
+
+      const firstResponse = JSON.parse(first.content[0].text);
+      const secondResponse = JSON.parse(second.content[0].text);
+      expect(firstResponse.result).toBe("success");
+      expect(secondResponse.result).toBe("duplicate_dropped");
+      const droppedEntry = mockAppendSafeOutput.mock.calls[1][0];
+      expect(droppedEntry._dropped_duplicate_by_title).toBe(true);
+    });
+
+    it("should fall back to Agent Output when title and body are blank", () => {
+      const h = createHandlers(mockServer, mockAppendSafeOutput, {
+        create_issue: {
+          deduplicate_by_title: true,
+        },
+      });
+
+      const first = h.createIssueHandler({ body: "   \n\n  " });
+      const second = h.createIssueHandler({ title: "Agent Output", body: "Real details for duplicate check" });
+
+      const firstResponse = JSON.parse(first.content[0].text);
+      const secondResponse = JSON.parse(second.content[0].text);
+      expect(firstResponse.result).toBe("success");
+      expect(secondResponse.result).toBe("duplicate_dropped");
+    });
+
     it("should append create_issue entry when dedup is disabled", () => {
       handlers.createIssueHandler({ title: "Issue A", body: "Body A" });
       handlers.createIssueHandler({ title: "Issue A", body: "Body A again" });
diff --git a/actions/setup/md/safe_outputs_auto_create_issue.md b/actions/setup/md/safe_outputs_auto_create_issue.md
index cd28d964e14..448a12f52ef 100644
--- a/actions/setup/md/safe_outputs_auto_create_issue.md
+++ b/actions/setup/md/safe_outputs_auto_create_issue.md
@@ -1,2 +1,8 @@
 
 **IMPORTANT**: Report your findings or results by creating a GitHub issue using the create_issue tool. If you have no meaningful results to report, call the noop tool instead.
+
+When calling create_issue:
+- `title`: a short, descriptive summary (aim for one sentence, ≤ 100 characters)
+- `body`: the full content — details, findings, context, and any supporting information
+
+Do **not** put all the content in the title; the title is a headline, and the body is where the substance goes.