fix(coding-agent): fixed tool validation and branch-cache fallback handling

- Added a regression test for tool argument coercion that preserves quoted edit arrays while stripping optional null fields.
- Updated footer branch-watcher initialization to clear cached branch state when resolving git head fails.
- Set the report_tool_issue tool definition to non-strict mode for looser argument handling.

packages/ai/test/tool-argument-coercion.test.ts

@@ -179,6 +179,38 @@ describe("Tool argument coercion", () => {
 		expect(result.edits).toEqual([{ target: "13#cf", new_content: "..." }]);
 	});
 
+	it("coerces quoted edit arrays before stripping optional null fields", () => {
+		const textSchema = Type.Union([Type.Array(Type.String()), Type.String()]);
+		const tool: Tool = {
+			name: "atom-like-edit",
+			description: "",
+			parameters: Type.Object({
+				path: Type.String(),
+				edits: Type.Array(
+					Type.Object({
+						loc: Type.String(),
+						set: Type.Optional(textSchema),
+						pre: Type.Optional(textSchema),
+						post: Type.Optional(textSchema),
+						sub: Type.Optional(Type.Tuple([Type.String(), Type.String()])),
+					}),
+				),
+			}),
+		};
+		const toolCall: ToolCall = {
+			type: "toolCall",
+			id: "call-atom-like-edit",
+			name: "atom-like-edit",
+			arguments: {
+				path: "orcid.ts",
+				edits: '[{"loc":"276ka-282vu","pre":null,"set":["line"],"post":null,"sub":null}]',
+			},
+		};
+
+		const result = validateToolArguments(tool, toolCall) as { edits: Array<Record<string, unknown>> };
+		expect(result.edits).toEqual([{ loc: "276ka-282vu", set: ["line"] }]);
+	});
+
 	it("coerces array strings with trailing wrapper braces from malformed nested JSON", () => {
 		const tool: Tool = {
 			name: "t16",

packages/coding-agent/src/modes/components/footer.ts

@@ -56,22 +56,27 @@ export class FooterComponent implements Component {
 			this.#gitWatcher = null;
 		}
 
-		git.head.resolve(getProjectDir()).then(head => {
-			if (!head) {
-				return;
-			}
+		void git.head
+			.resolve(getProjectDir())
+			.then(head => {
+				if (!head) {
+					return;
+				}
 
-			try {
-				this.#gitWatcher = fs.watch(head.headPath, () => {
-					this.#cachedBranch = undefined; // Invalidate cache
-					if (this.#onBranchChange) {
-						this.#onBranchChange();
-					}
-				});
-			} catch {
-				// Silently fail if we can't watch
-			}
-		});
+				try {
+					this.#gitWatcher = fs.watch(head.headPath, () => {
+						this.#cachedBranch = undefined; // Invalidate cache
+						if (this.#onBranchChange) {
+							this.#onBranchChange();
+						}
+					});
+				} catch {
+					// Silently fail if we can't watch
+				}
+			})
+			.catch(() => {
+				this.#cachedBranch = null;
+			});
 	}
 
 	/**

packages/coding-agent/src/tools/report-tool-issue.ts

@@ -57,6 +57,7 @@ export function createReportToolIssueTool(session: ToolSession): AgentTool {
 	return {
 		name: "report_tool_issue",
 		label: "Report Tool Issue",
+		strict: false,
 		description: "Report unexpected tool behavior for automated QA tracking.",
 		parameters: ReportToolIssueParams,
 		async execute(_toolCallId, rawParams) {