diff --git a/src/agent/claude-code/binary.ts b/src/agent/claude-code/binary.ts
index 5e57cda..81b4a55 100644
--- a/src/agent/claude-code/binary.ts
+++ b/src/agent/claude-code/binary.ts
@@ -18,32 +18,51 @@ type SearchSpec = {
 function getWindowsSearchSpec(env: BinaryLookup["env"], homeDir: string): SearchSpec {
 	const paths = path.win32;
 	const appData = env.APPDATA ?? paths.join(homeDir, "AppData", "Roaming");
+
 	return {
 		paths,
 		names: ["claude.exe", "claude.cmd"],
-		knownDirs: [paths.join(homeDir, ".local", "bin"), paths.join(homeDir, ".claude", "local"), env.npm_config_prefix ?? paths.join(appData, "npm")],
+		knownDirs: [
+			paths.join(homeDir, ".local", "bin"),
+			paths.join(homeDir, ".claude", "local"),
+			env.npm_config_prefix ?? paths.join(appData, "npm"),
+		],
 	};
 }
 
 function getPosixSearchSpec(env: BinaryLookup["env"], homeDir: string): SearchSpec {
 	const paths = path.posix;
-	const npmBin = env.npm_config_prefix ? paths.join(env.npm_config_prefix, "bin") : paths.join(homeDir, ".npm-global", "bin");
+	const npmBin = env.npm_config_prefix
+		? paths.join(env.npm_config_prefix, "bin")
+		: paths.join(homeDir, ".npm-global", "bin");
+
 	return {
 		paths,
 		names: ["claude"],
-		knownDirs: [paths.join(homeDir, ".local", "bin"), paths.join(homeDir, ".claude", "local"), npmBin, "/opt/homebrew/bin", "/usr/local/bin"],
+		knownDirs: [
+			paths.join(homeDir, ".local", "bin"),
+			paths.join(homeDir, ".claude", "local"),
+			npmBin,
+			"/opt/homebrew/bin",
+			"/usr/local/bin",
+		],
 	};
 }
 
 export function resolveClaudeBinary({ env, platform, homeDir, isExecutable }: BinaryLookup): string | null {
-	const { paths, names, knownDirs } = platform === "win32" ? getWindowsSearchSpec(env, homeDir) : getPosixSearchSpec(env, homeDir);
+	const { paths, names, knownDirs } = platform === "win32"
+		? getWindowsSearchSpec(env, homeDir)
+		: getPosixSearchSpec(env, homeDir);
+
 	const pathDirs = (env.PATH ?? "").split(paths.delimiter).filter(Boolean);
+
 	for (const name of names) {
 		for (const dir of [...pathDirs, ...knownDirs]) {
 			const candidate = paths.join(dir, name);
 			if (isExecutable(candidate)) return candidate;
 		}
 	}
+
 	return null;
 }
 
@@ -57,5 +76,10 @@ function isExecutableFile(filePath: string): boolean {
 }
 
 export function getClaudeBinary(): string | null {
-	return resolveClaudeBinary({ env: process.env, platform: process.platform, homeDir: os.homedir(), isExecutable: isExecutableFile });
+	return resolveClaudeBinary({
+		env: process.env,
+		platform: process.platform,
+		homeDir: os.homedir(),
+		isExecutable: isExecutableFile,
+	});
 }
diff --git a/src/agent/claude-code/transcript.ts b/src/agent/claude-code/transcript.ts
index 67cba3c..ecc5e5d 100644
--- a/src/agent/claude-code/transcript.ts
+++ b/src/agent/claude-code/transcript.ts
@@ -1,7 +1,9 @@
 import type { ImageContent, Message, TextContent, Tool } from "@earendil-works/pi-ai";
 import { getCurrentSystemPrompt, getCurrentTools } from "@earendil-works/pi-ai/utils/transcript";
 
-export type ClaudeContentBlock = { type: "text"; text: string } | { type: "image"; source: { type: "base64"; media_type: string; data: string } };
+export type ClaudeContentBlock =
+	| { type: "text"; text: string }
+	| { type: "image"; source: { type: "base64"; media_type: string; data: string } };
 
 export type ClaudeInput = {
 	systemPrompt: string;
@@ -17,8 +19,10 @@ function toImageBlock(image: ImageContent): ClaudeContentBlock {
 
 function getLabelledParts(label: string, content: string | (TextContent | ImageContent)[]): ReplayPart[] {
 	if (typeof content === "string") return [`${label}\n${content}`];
+
 	const text = content.flatMap((block) => (block.type === "text" ? [block.text] : [])).join("\n");
 	const images = content.filter((block) => block.type === "image");
+
 	return [text ? `${label}\n${text}` : label, ...images];
 }
 
@@ -26,26 +30,33 @@ function getReplayParts(message: Message): ReplayPart[] {
 	switch (message.role) {
 		case "system":
 			return [];
+
 		case "user":
 			return getLabelledParts("[user]", message.content);
+
 		case "assistant":
 			return message.content.flatMap((block) => {
 				if (block.type === "text") return [`[assistant]\n${block.text}`];
 				if (block.type === "toolCall") return [`[tool call ${block.name}] ${JSON.stringify(block.arguments)}`];
 				return [];
 			});
-		case "toolResult":
-			return getLabelledParts(message.isError ? `[tool result ${message.toolName} error]` : `[tool result ${message.toolName}]`, message.content);
+
+		case "toolResult": {
+			const label = message.isError ? `[tool result ${message.toolName} error]` : `[tool result ${message.toolName}]`;
+			return getLabelledParts(label, message.content);
+		}
 	}
 }
 
 function toContentBlocks(parts: ReplayPart[]): ClaudeContentBlock[] {
 	const blocks: ClaudeContentBlock[] = [];
 	let pendingText: string[] = [];
+
 	const flushText = () => {
 		if (pendingText.length > 0) blocks.push({ type: "text", text: pendingText.join("\n\n") });
 		pendingText = [];
 	};
+
 	for (const part of parts) {
 		if (typeof part === "string") {
 			pendingText.push(part);
@@ -54,20 +65,33 @@ function toContentBlocks(parts: ReplayPart[]): ClaudeContentBlock[] {
 			blocks.push(toImageBlock(part));
 		}
 	}
+
 	flushText();
+
 	return blocks;
 }
 
 function toUnlabelledBlocks(content: string | (TextContent | ImageContent)[]): ClaudeContentBlock[] {
 	if (typeof content === "string") return [{ type: "text", text: content }];
+
 	return content.map((block) => (block.type === "text" ? { type: "text", text: block.text } : toImageBlock(block)));
 }
 
+function toUserContent(conversation: Message[]): ClaudeContentBlock[] {
+	const [first] = conversation;
+	if (conversation.length === 1 && first?.role === "user") return toUnlabelledBlocks(first.content);
+
+	return toContentBlocks(conversation.flatMap(getReplayParts));
+}
+
 export function toClaudeInput(messages: Message[]): ClaudeInput {
 	const conversation = messages.filter((message) => message.role !== "system");
-	const onlyMessage = conversation.length === 1 ? conversation[0] : null;
-	const userContent = onlyMessage?.role === "user" ? toUnlabelledBlocks(onlyMessage.content) : toContentBlocks(conversation.flatMap(getReplayParts));
-	return { systemPrompt: getCurrentSystemPrompt(messages), tools: getCurrentTools(messages), userContent };
+
+	return {
+		systemPrompt: getCurrentSystemPrompt(messages),
+		tools: getCurrentTools(messages),
+		userContent: toUserContent(conversation),
+	};
 }
 
 export function toStreamJsonLine(content: ClaudeContentBlock[]): string {
diff --git a/tests/claude-code-binary.test.ts b/tests/claude-code-binary.test.ts
index 00c7d34..66a716a 100644
--- a/tests/claude-code-binary.test.ts
+++ b/tests/claude-code-binary.test.ts
@@ -45,7 +45,10 @@ test("windows looks for claude.cmd and claude.exe", () => {
 	assert.equal(resolveWith(["C:\\bin\\claude.cmd"], env, "win32", winHome), "C:\\bin\\claude.cmd");
 	assert.equal(resolveWith(["C:\\bin\\claude.exe"], env, "win32", winHome), "C:\\bin\\claude.exe");
 	assert.equal(resolveWith([`${winHome}\\.local\\bin\\claude.exe`], env, "win32", winHome), `${winHome}\\.local\\bin\\claude.exe`);
-	assert.equal(resolveWith([`${winHome}\\AppData\\Roaming\\npm\\claude.cmd`], env, "win32", winHome), `${winHome}\\AppData\\Roaming\\npm\\claude.cmd`);
+	assert.equal(
+		resolveWith([`${winHome}\\AppData\\Roaming\\npm\\claude.cmd`], env, "win32", winHome),
+		`${winHome}\\AppData\\Roaming\\npm\\claude.cmd`,
+	);
 	assert.equal(resolveWith(["C:\\bin\\claude"], env, "win32", winHome), null);
 });
 
diff --git a/tests/claude-code-transcript.test.ts b/tests/claude-code-transcript.test.ts
index 0fbec27..5e8db33 100644
--- a/tests/claude-code-transcript.test.ts
+++ b/tests/claude-code-transcript.test.ts
@@ -29,7 +29,14 @@ function assistant(content: AssistantMessage["content"]): AssistantMessage {
 		api: "claude-code-cli",
 		provider: "claude-code",
 		model: "opus",
-		usage: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, totalTokens: 0, cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 } },
+		usage: {
+			input: 0,
+			output: 0,
+			cacheRead: 0,
+			cacheWrite: 0,
+			totalTokens: 0,
+			cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+		},
 		stopReason: "stop",
 		timestamp: 0,
 	};
@@ -96,7 +103,12 @@ test("error tool results are marked as errors in the replay", () => {
 		toolResult("read", [{ type: "text", text: "ENOENT" }], true),
 		user("why?"),
 	];
-	const expected = ["[user]\nopen missing.md", '[tool call read] {"path":"missing.md"}', "[tool result read error]\nENOENT", "[user]\nwhy?"].join("\n\n");
+	const expected = [
+		"[user]\nopen missing.md",
+		'[tool call read] {"path":"missing.md"}',
+		"[tool result read error]\nENOENT",
+		"[user]\nwhy?",
+	].join("\n\n");
 	assert.deepEqual(toClaudeInput(messages).userContent, [{ type: "text", text: expected }]);
 });
 
@@ -142,5 +154,8 @@ test("thinking blocks are omitted from replay", () => {
 });
 
 test('toStreamJsonLine emits {"type":"user","message":{"role":"user","content":[...]}}', () => {
-	assert.deepEqual(JSON.parse(toStreamJsonLine([{ type: "text", text: "hi" }])), { type: "user", message: { role: "user", content: [{ type: "text", text: "hi" }] } });
+	assert.deepEqual(JSON.parse(toStreamJsonLine([{ type: "text", text: "hi" }])), {
+		type: "user",
+		message: { role: "user", content: [{ type: "text", text: "hi" }] },
+	});
 });