diff --git a/packages/contracts/src/keybindings.ts b/packages/contracts/src/keybindings.ts
index 19276c41e7b6..43c6dd15ae82 100644
--- a/packages/contracts/src/keybindings.ts
+++ b/packages/contracts/src/keybindings.ts
@@ -75,12 +75,19 @@ export const STATIC_KEYBINDING_COMMANDS = [
   ...THREAD_KEYBINDING_COMMANDS,
 ] as const;
 
+/**
+ * Identifier portion of a script run command (`script.<id>.run`). The web
+ * client rebuilds that command during keybinding wiring, so any id persisted
+ * by the server must satisfy this constraint or thread views throw.
+ */
+export const ProjectScriptId = Schema.NonEmptyString.check(
+  Schema.isMaxLength(MAX_SCRIPT_ID_LENGTH),
+  Schema.isPattern(/^[a-z0-9][a-z0-9-]*$/),
+);
+
 export const SCRIPT_RUN_COMMAND_PATTERN = Schema.TemplateLiteral([
   Schema.Literal("script."),
-  Schema.NonEmptyString.check(
-    Schema.isMaxLength(MAX_SCRIPT_ID_LENGTH),
-    Schema.isPattern(/^[a-z0-9][a-z0-9-]*$/),
-  ),
+  ProjectScriptId,
   Schema.Literal(".run"),
 ]);
 
diff --git a/packages/contracts/src/orchestration.test.ts b/packages/contracts/src/orchestration.test.ts
index 3e1b9be0bba5..db66185dc265 100644
--- a/packages/contracts/src/orchestration.test.ts
+++ b/packages/contracts/src/orchestration.test.ts
@@ -221,6 +221,49 @@ it.effect("rejects command fields that become empty after trim", () =>
   }),
 );
 
+it.effect("rejects project scripts whose ids cannot form keybinding commands", () =>
+  Effect.gen(function* () {
+    // The web client rebuilds `script.<id>.run` keybinding commands while
+    // rendering; an id outside the pattern's constraint crashes thread
+    // views, so the server must refuse to persist it.
+    const result = yield* Effect.exit(
+      decodeProjectMetaUpdatedPayload({
+        projectId: "project-1",
+        updatedAt: "2026-01-01T00:00:00.000Z",
+        scripts: [
+          {
+            id: "123e4567-e89b-42d3-a456-426614174000",
+            name: "Setup",
+            command: "echo hi",
+            icon: "configure",
+            runOnWorktreeCreate: false,
+          },
+        ],
+      }),
+    );
+    assert.strictEqual(result._tag, "Failure");
+  }),
+);
+
+it.effect("accepts project scripts with conforming ids", () =>
+  Effect.gen(function* () {
+    const parsed = yield* decodeProjectMetaUpdatedPayload({
+      projectId: "project-1",
+      updatedAt: "2026-01-01T00:00:00.000Z",
+      scripts: [
+        {
+          id: "run-setup",
+          name: "Setup",
+          command: "echo hi",
+          icon: "configure",
+          runOnWorktreeCreate: false,
+        },
+      ],
+    });
+    assert.strictEqual(parsed.scripts?.[0]?.id, "run-setup");
+  }),
+);
+
 it.effect("decodes thread.turn.start defaults for provider and runtime mode", () =>
   Effect.gen(function* () {
     const parsed = yield* decodeThreadTurnStartCommand({
diff --git a/packages/contracts/src/orchestration.ts b/packages/contracts/src/orchestration.ts
index adb17879ff2f..eee8cb0babb1 100644
--- a/packages/contracts/src/orchestration.ts
+++ b/packages/contracts/src/orchestration.ts
@@ -23,6 +23,7 @@ import {
   TurnId,
 } from "./baseSchemas.ts";
 import { ProviderInstanceId } from "./providerInstance.ts";
+import { ProjectScriptId } from "./keybindings.ts";
 
 export const ORCHESTRATION_WS_METHODS = {
   dispatchCommand: "orchestration.dispatchCommand",
@@ -207,7 +208,12 @@ export const ProjectScriptIcon = Schema.Literals([
 export type ProjectScriptIcon = typeof ProjectScriptIcon.Type;
 
 export const ProjectScript = Schema.Struct({
-  id: TrimmedNonEmptyString,
+  /**
+   * Must satisfy the script-id constraint from the keybinding command
+   * pattern (`script.<id>.run`); the web client rebuilds that command while
+   * rendering, so a non-conforming id persisted here crashes thread views.
+   */
+  id: ProjectScriptId,
   name: TrimmedNonEmptyString,
   command: TrimmedNonEmptyString,
   icon: ProjectScriptIcon,