diff --git a/package.json b/package.json
index 330d0d91b7..d637db7fea 100644
--- a/package.json
+++ b/package.json
@@ -291,8 +291,8 @@
     "verify:solidity:metadata": "npm run build:cached && node scripts/verify-solidity-metadata.mjs",
     "verify:recorded:crash": "npm run build:cached && node scripts/verify-recorded-crash.mjs",
     "mcp-catalog:check:built": "node scripts/generate-mcp-tool-catalog.mjs --check",
-    "compile": "node scripts/clean-build-output.mjs && tsc -p tsconfig.build.json && node scripts/bundle-runtime.mjs",
-    "compile:termux": "node scripts/clean-build-output.mjs && node --max-old-space-size=3072 node_modules/typescript-termux/lib/tsc.js -p tsconfig.build.json && node scripts/bundle-runtime.mjs",
+    "compile": "node scripts/clean-build-output.mjs && tsc -p tsconfig.build.json && node scripts/record-catalog-digests.mjs && node scripts/bundle-runtime.mjs",
+    "compile:termux": "node scripts/clean-build-output.mjs && node --max-old-space-size=3072 node_modules/typescript-termux/lib/tsc.js -p tsconfig.build.json && node scripts/record-catalog-digests.mjs && node scripts/bundle-runtime.mjs",
     "artifacts:mcp-catalog": "node scripts/generate-mcp-tool-catalog.mjs",
     "artifacts:skills": "node scripts/generate-skill-metadata.mjs",
     "artifacts:product-catalog": "node scripts/generate-product-catalog.mjs",
diff --git a/scripts/record-catalog-digests.mjs b/scripts/record-catalog-digests.mjs
new file mode 100644
index 0000000000..82807c121f
--- /dev/null
+++ b/scripts/record-catalog-digests.mjs
@@ -0,0 +1,19 @@
+import { writeFile } from "node:fs/promises";
+import { dirname, join, resolve } from "node:path";
+import { fileURLToPath, pathToFileURL } from "node:url";
+
+// Record the default catalog digests into the compiled runtime. Run after
+// `tsc` and before bundling, so the digests come from the same compiled
+// contracts and pinned schema converter that the runtime serves.
+const compiledRoot = resolve(
+  dirname(fileURLToPath(import.meta.url)),
+  "../dist",
+);
+const { createCatalogDigests } = await import(
+  pathToFileURL(join(compiledRoot, "catalogIdentity.js")).href
+);
+await writeFile(
+  join(compiledRoot, "recordedCatalogDigests.js"),
+  `/** Recorded from the compiled default catalog by scripts/record-catalog-digests.mjs; do not edit. */\nexport const RECORDED_CATALOG_DIGESTS = Object.freeze(${JSON.stringify(createCatalogDigests())});\n`,
+  "utf8",
+);
diff --git a/src/catalogIdentity.ts b/src/catalogIdentity.ts
index 676251dd02..80425d26ee 100644
--- a/src/catalogIdentity.ts
+++ b/src/catalogIdentity.ts
@@ -17,6 +17,7 @@ import {
   type CompactInputSchemaPresentation,
 } from "./contracts/compactInputSchema.js";
 import type { McpOutputSchemaProfile } from "./config/mcpOutputSchemaProfile.js";
+import { RECORDED_CATALOG_DIGESTS } from "./recordedCatalogDigests.js";
 
 const sortByName = (
   contracts: readonly ToolContract[],
@@ -102,6 +103,8 @@ export const createCatalogDigests = (
   } as const;
 };
 
+export type CatalogDigests = ReturnType<typeof createCatalogDigests>;
+
 export const createCatalogIdentity = (
   compactPresentation: CompactInputSchemaPresentation | undefined = undefined,
   outputSchemaProfile: McpOutputSchemaProfile = "full",
@@ -110,7 +113,12 @@ export const createCatalogIdentity = (
     compactPresentation === undefined
       ? undefined
       : { budgetBytes: compactPresentation.budgetBytes };
-  let catalogDigests: ReturnType<typeof createCatalogDigests> | undefined;
+  // Building and canonicalizing every advertised schema dominates doctor and
+  // server startup, so the compiled runtime records the default digests once.
+  let catalogDigests: CatalogDigests | undefined =
+    selectedPresentation === undefined && outputSchemaProfile === "full"
+      ? RECORDED_CATALOG_DIGESTS
+      : undefined;
   return {
     counts: {
       cli_commands: CLI_COMMAND_NAMES.length,
@@ -128,5 +136,8 @@ export const createCatalogIdentity = (
   } as const;
 };
 
-/** Stable, schema-sensitive identity; schema digests are computed on first use. */
+/**
+ * Stable, schema-sensitive identity; schema digests are recorded at build time
+ * or computed on first use.
+ */
 export const CATALOG_IDENTITY = createCatalogIdentity();
diff --git a/src/recordedCatalogDigests.ts b/src/recordedCatalogDigests.ts
new file mode 100644
index 0000000000..fc37c24d50
--- /dev/null
+++ b/src/recordedCatalogDigests.ts
@@ -0,0 +1,8 @@
+import type { CatalogDigests } from "./catalogIdentity.js";
+
+/**
+ * Digests of the default catalog (full input and output schemas), recorded
+ * from the compiled contracts by `scripts/record-catalog-digests.mjs` after
+ * compilation. Source runs leave this undefined and compute them on first use.
+ */
+export const RECORDED_CATALOG_DIGESTS: CatalogDigests | undefined = undefined;
diff --git a/turbo.json b/turbo.json
index 8ca759ba1a..37783a4afd 100644
--- a/turbo.json
+++ b/turbo.json
@@ -13,6 +13,7 @@
         "scripts/check-dependency-install.mjs",
         "scripts/clean-build-output.mjs",
         "scripts/bundle-runtime.mjs",
+        "scripts/record-catalog-digests.mjs",
         "scripts/generate-package-metadata.mjs",
         "src/**/*.{cts,mts,ts,tsx}",
         "src/**/package.json",