fix(secrets): scan typed JSON collision values

packages/coding-agent/src/advisor/__tests__/advisor.test.ts

@@ -1028,6 +1028,40 @@ describe("advisor", () => {
 			expect(prompt).toContain("TOKABC123_");
 		});
 
+		it("collects regex values from tool arguments that resemble image blocks", async () => {
+			const obfuscator = new SecretObfuscator([
+				{ type: "plain", content: "OTHERSECRET", friendlyName: "TOKABC123" },
+				{ type: "regex", content: "tok_[a-z0-9]+" },
+			]);
+			const promptInputs: string[] = [];
+			const agent = makeAgent(promptInputs);
+			const messages: AgentMessage[] = [
+				{ role: "user", content: "remember OTHERSECRET for later", timestamp: 1 } as AgentMessage,
+				{
+					role: "assistant",
+					content: [
+						{ type: "toolCall", id: "call-1", name: "read", arguments: { type: "image", value: "tok_abc123" } },
+					],
+					timestamp: 2,
+				} as unknown as AgentMessage,
+			];
+			const host: AdvisorRuntimeHost = {
+				snapshotMessages: () => messages,
+				enqueueAdvice: () => {},
+				obfuscator,
+			};
+			const runtime = new AdvisorRuntime(agent, host);
+
+			runtime.onTurnEnd();
+			await Promise.resolve();
+
+			expect(promptInputs).toHaveLength(1);
+			const prompt = promptInputs[0]!;
+			expect(prompt).not.toContain("OTHERSECRET");
+			expect(prompt).not.toContain("tok_abc123");
+			expect(prompt).not.toContain("TOKABC123_");
+		});
+
 		it("expands plan-mode context once, then collapses an unchanged re-injection", async () => {
 			const promptInputs: string[] = [];
 			const agent = makeAgent(promptInputs);

packages/coding-agent/src/advisor/runtime.ts

@@ -553,10 +553,6 @@ function obfuscateAdvisorMessage(
 	}
 }
 
-function isImageBlock(value: object): value is ImageContent {
-	return "type" in value && value.type === "image";
-}
-
 function collectAdvisorRegexSecretValues(obfuscator: SecretObfuscator, messages: AgentMessage[]): Set<string> {
 	const values = new Set<string>();
 	const add = (value: string | undefined): void => {
@@ -574,7 +570,7 @@ function collectAdvisorRegexSecretValues(obfuscator: SecretObfuscator, messages:
 			for (const item of value) addJsonStrings(item);
 			return;
 		}
-		if (value === null || typeof value !== "object" || isImageBlock(value)) return;
+		if (value === null || typeof value !== "object") return;
 		for (const item of Object.values(value)) addJsonStrings(item);
 	};
 	const addContent = (content: TextualContent): void => {

packages/coding-agent/src/export/share.ts

@@ -120,7 +120,7 @@ function collectShareRegexSecretValues(o: SecretObfuscator, data: SessionData):
 			for (const item of value) addJsonStrings(item);
 			return;
 		}
-		if (!isRecord(value) || value.type === "image") return;
+		if (!isRecord(value)) return;
 		for (const item of Object.values(value)) addJsonStrings(item);
 	};
 	const addContent = (content: string | (TextContent | ImageContent)[]): void => {

packages/coding-agent/test/share.test.ts

@@ -402,6 +402,43 @@ describe("buildShareSnapshot", () => {
 		expect(flat).not.toContain(regexSecret);
 		expect(flat).toContain(`${friendlyName}_`);
 	});
+
+	test("collects regex values from tool arguments that resemble image blocks", () => {
+		const plainSecret = "OTHERSECRET";
+		const friendlyName = "TOKABC123";
+		const regexSecret = "tok_abc123";
+		const ts = "2026-06-12T00:00:00.000Z";
+		const entries: SessionEntry[] = [
+			{
+				type: "message",
+				id: "a1",
+				parentId: null,
+				timestamp: ts,
+				message: {
+					role: "assistant",
+					content: [
+						{ type: "toolCall", id: "call-1", name: "read", arguments: { type: "image", value: regexSecret } },
+					],
+					timestamp: 1,
+				},
+			} as unknown as SessionEntry,
+		];
+		const sm = {
+			getHeader: () => ({ ...sessionData([], "x").header, title: `remember ${plainSecret}` }),
+			getEntries: () => entries,
+			getLeafId: () => "a1",
+		} as unknown as SessionManager;
+		const obfuscator = new SecretObfuscator([
+			{ type: "plain", content: plainSecret, friendlyName },
+			{ type: "regex", content: "tok_[a-z0-9]+" },
+		]);
+
+		const flat = JSON.stringify(buildShareSnapshot(sm, { obfuscator }));
+
+		expect(flat).not.toContain(plainSecret);
+		expect(flat).not.toContain(regexSecret);
+		expect(flat).not.toContain(`${friendlyName}_`);
+	});
 });
 
 describe("normalizeShareServerUrl", () => {