fix(harness): declare pi-mcp-adapter peer deps so the pi harness runs

eval/real-runner.ts

@@ -18,6 +18,10 @@ export function createRealRunner(token: string): CaseRunner {
 
     let ok = false
     let costUsd: number | null = null
+    // The first step-failure reason — runIntegration catches per-step errors and
+    // reports them as events rather than throwing, so capture it here to surface
+    // why a case failed instead of leaving it a silent `no`.
+    let error: string | undefined
     await runIntegration({
       root: workDir,
       sdk: context.config.sdk,
@@ -28,12 +32,15 @@ export function createRealRunner(token: string): CaseRunner {
       mode: spec.mode,
       signal: context.signal,
       onEvent: (event) => {
+        if (event.kind === 'step_failed' && error == null) {
+          error = event.reason
+        }
         if (event.kind === 'done') {
           ok = event.ok
           costUsd = event.cost_usd
         }
       },
     })
-    return { ok, costUsd }
+    return { ok, costUsd, ...(error != null ? { error } : {}) }
   }
 }

eval/run-case.ts

@@ -10,6 +10,8 @@ import { captureDiff, prepareFixture } from './workspace.js'
 export interface RunOutcome {
   ok: boolean
   costUsd: number | null
+  // Why the run failed, when the runner caught a reason rather than throwing.
+  error?: string
 }
 
 export interface RunContext {
@@ -48,6 +50,7 @@ export async function runCase(args: {
     const outcome = await runner(workDir, spec, { config, signal })
     ok = outcome.ok
     costUsd = outcome.costUsd
+    error = outcome.error
   } catch (caught) {
     error = caught instanceof Error ? caught.message : String(caught)
   }

eval/run.ts

@@ -65,6 +65,18 @@ async function main(): Promise<void> {
 
   write('')
   write(formatReport(results))
+
+  // Surface why any case failed, so a `no` row is never a dead end.
+  const failures = results.filter((result) => result.error != null)
+  if (failures.length > 0) {
+    write('')
+    write('Failures:')
+    for (const failure of failures) {
+      write(
+        `  ${failure.fixture} · ${failure.mode} · ${failure.harness}: ${failure.error}`,
+      )
+    }
+  }
 }
 
 function readFixtureConfig(fixture: string): FixtureConfig {

package.json

@@ -91,7 +91,8 @@
     "jiti": "^2.7.0",
     "minimist": "^1.2.8",
     "open": "^11.0.0",
-    "pi-mcp-adapter": "~2.15.0"
+    "pi-mcp-adapter": "~2.15.0",
+    "typebox": "1.1.38"
   },
   "devDependencies": {
     "@seamapi/cli": "^0.32.0",