diff --git a/CLAUDE.md b/CLAUDE.md
index 1c3f06e..a530002 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -23,6 +23,7 @@ Transcript-based shell integration test runner. Bun + TypeScript.
 - `src/match.ts` — wildcard-aware output matching and diff generation
 - `src/format.ts` — evaluates pass/fail, formats failures and summary
 - `src/update.ts` — rewrites `.shout` files with actual output (`--update` mode)
+- `src/utils.ts` — shared utilities (`trimTrailingEmpty`, `escapeRegex`)
 - `src/duration.ts` — parses duration strings (`10s`, `500ms`, `1m`)
 - `src/cli/index.ts` — CLI entry point via `commander`
 - `src/index.ts` — barrel exports
diff --git a/package.json b/package.json
index 4d0a498..714d9e1 100644
--- a/package.json
+++ b/package.json
@@ -15,9 +15,7 @@
   },
   "scripts": {
     "check": "bunx tsc --noEmit",
-    "cli:install": "bun cli:build && sudo cp dist/shout /usr/local/bin",
     "cli:link": "ln -sf $(pwd)/src/cli/index.ts ~/.bun/bin/shout",
-    "cli:uninstall": "sudo rm /usr/local/bin",
     "test": "bun test"
   },
   "devDependencies": {
diff --git a/src/duration.ts b/src/duration.ts
index 95490d4..f0b332d 100644
--- a/src/duration.ts
+++ b/src/duration.ts
@@ -3,11 +3,12 @@ export function parseDuration(s: string): number {
   if (!match) throw new Error(`Invalid duration: ${s}`)
 
   const value = parseFloat(match[1]!)
-  const unit = match[2] as "ms" | "s" | "m"
+  const unit = match[2]!
 
   switch (unit) {
     case "ms": return value
     case "s": return value * 1000
     case "m": return value * 60_000
+    default: throw new Error(`Unknown unit: ${unit}`)
   }
 }
diff --git a/src/index.ts b/src/index.ts
index 107ee68..29281a8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-export type { Command, ShoutFile } from "./parse.ts"
+export type { Command, Directive, ShoutFile } from "./parse.ts"
 export type { CommandResult, FileResult } from "./run.ts"
 export type { DiffLine } from "./match.ts"
 export type { TestResult } from "./format.ts"
diff --git a/src/run.ts b/src/run.ts
index 931b651..4e34396 100644
--- a/src/run.ts
+++ b/src/run.ts
@@ -3,7 +3,7 @@ import { tmpdir } from "node:os"
 import { join } from "node:path"
 
 import type { Command, ShoutFile } from "./parse.ts"
-import { trimTrailingEmpty, escapeRegex } from "./utils.ts"
+import { trimTrailingEmpty } from "./utils.ts"
 
 export type CommandResult = {
   command: Command
@@ -46,7 +46,6 @@ function buildScript(commands: Command[]): string {
 
 function parseSentinelOutput(
   raw: string,
-  sentinel: string,
   commandCount: number,
 ): { outputs: string[][]; exitCodes: number[] } {
   const outputs: string[][] = []
@@ -54,7 +53,7 @@ function parseSentinelOutput(
 
   // Split by sentinel lines
   const sentinelRegex = new RegExp(
-    `${escapeRegex(sentinel)}(\\d+)_(\\d+)__`,
+    `${SENTINEL_PREFIX}(\\d+)_(\\d+)__`,
   )
 
   let remaining = raw
@@ -146,7 +145,6 @@ export async function runFile(
 
     const { outputs, exitCodes } = parseSentinelOutput(
       stdout,
-      SENTINEL_PREFIX,
       file.commands.length,
     )