diff --git a/jest.config.packages.js b/jest.config.packages.js
index a7c6bc1e1..bb3ef91aa 100644
--- a/jest.config.packages.js
+++ b/jest.config.packages.js
@@ -77,19 +77,23 @@ module.exports = {
   // ],
 
   // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
-  // Here we ensure that Jest resolves `@metamask/*` imports to the uncompiled source code for packages that live in this repo.
-  // NOTE: This must be synchronized with the `paths` option in `tsconfig.base.json`.
+  // Resolve workspace `@metamask/*` imports to uncompiled source. Paths are
+  // relative to the monorepo root, not to the consuming package. When a local
+  // `packages/<name>/src` directory does not exist, use the installed package.
+  // NOTE: This must be synchronized with the `paths` option in `tsconfig.packages.json`.
   moduleNameMapper: {
     '^@metamask/json-rpc-engine/v2$': [
       '<rootDir>/../json-rpc-engine/src/v2/index.ts',
     ],
     '^@metamask/utils/node$': require.resolve('@metamask/utils/node'),
-    '^@metamask/(.+)$': [
-      '<rootDir>/../$1/src',
-      // Some @metamask/* packages we are referencing aren't in this monorepo,
-      // so in that case use their published versions
+    '^@metamask/([^/]+)$': [
+      '<rootDir>/../../packages/$1/src',
       '<rootDir>/../../node_modules/@metamask/$1',
     ],
+    '^@metamask/([^/]+)/(.+)$': [
+      '<rootDir>/../../packages/$1/src/$2',
+      '<rootDir>/../../node_modules/@metamask/$1/$2',
+    ],
   },
 
   // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
diff --git a/packages/bitcoin-wallet-snap/CHANGELOG.md b/packages/bitcoin-wallet-snap/CHANGELOG.md
index 570452d8e..e30fcfa79 100644
--- a/packages/bitcoin-wallet-snap/CHANGELOG.md
+++ b/packages/bitcoin-wallet-snap/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Resolve workspace `@metamask/*` TypeScript types from the monorepo root instead of assuming sibling directories ([#167](https://github.com/MetaMask/internal-snaps/pull/167))
+
 ## [2.0.1]
 
 ### Fixed
diff --git a/packages/bitcoin-wallet-snap/snap.manifest.json b/packages/bitcoin-wallet-snap/snap.manifest.json
index f594f203d..9e59617f5 100644
--- a/packages/bitcoin-wallet-snap/snap.manifest.json
+++ b/packages/bitcoin-wallet-snap/snap.manifest.json
@@ -7,7 +7,7 @@
     "url": "https://github.com/MetaMask/internal-snaps.git"
   },
   "source": {
-    "shasum": "jV649WZbbfbj3FpOMD5U/xDPuRD0t4F+pxCoy08a/O0=",
+    "shasum": "PpNYFDDadcYp9uuFWMdaURUB5G8vsXrwOETgpFEzUW4=",
     "location": {
       "npm": {
         "filePath": "dist/bundle.js",
diff --git a/packages/bitcoin-wallet-snap/tsconfig.json b/packages/bitcoin-wallet-snap/tsconfig.json
index a8a6abb0f..8dfec9077 100644
--- a/packages/bitcoin-wallet-snap/tsconfig.json
+++ b/packages/bitcoin-wallet-snap/tsconfig.json
@@ -1,19 +1,11 @@
 {
-  "extends": "../../tsconfig.packages.json",
+  "extends": "../../tsconfig.snaps.json",
   "compilerOptions": {
-    "baseUrl": "./",
     "lib": ["ES2021", "DOM"],
-    "resolveJsonModule": true /*  lets us import JSON modules from within TypeScript modules. */,
-    "jsx": "react-jsx",
-    "jsxImportSource": "@metamask/snaps-sdk",
     "exactOptionalPropertyTypes": false,
     "forceConsistentCasingInFileNames": true,
     "noErrorTruncation": true,
-    "noUncheckedIndexedAccess": true,
-    "skipLibCheck": true,
-    "module": "ESNext",
-    "moduleResolution": "bundler",
-    "types": ["jest"]
+    "noUncheckedIndexedAccess": true
   },
   "include": ["**/*.ts", "**/*.tsx", "locales/*.json"]
 }
diff --git a/packages/sample-snap/tsconfig.json b/packages/sample-snap/tsconfig.json
index 6db6f2381..036b93ac5 100644
--- a/packages/sample-snap/tsconfig.json
+++ b/packages/sample-snap/tsconfig.json
@@ -1,11 +1,4 @@
 {
-  "extends": "../../tsconfig.packages.json",
-  "compilerOptions": {
-    "baseUrl": "./",
-    "jsx": "react-jsx",
-    "skipLibCheck": true,
-    "jsxImportSource": "@metamask/snaps-sdk",
-    "types": ["jest"]
-  },
+  "extends": "../../tsconfig.snaps.json",
   "include": ["**/*.ts", "**/*.tsx", "locales/*.json"]
 }
diff --git a/packages/snap-networks-utils/CHANGELOG.md b/packages/snap-networks-utils/CHANGELOG.md
index dac68b80a..cfe98ffe3 100644
--- a/packages/snap-networks-utils/CHANGELOG.md
+++ b/packages/snap-networks-utils/CHANGELOG.md
@@ -13,6 +13,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Bump `@metamask/utils` from `^11.9.0` to `^11.11.9` ([#161](https://github.com/MetaMask/internal-snaps/pull/161))
 
+### Fixed
+
+- Assign optional `Logger` `prefix` and `decorators` only when they are provided so `exactOptionalPropertyTypes` consumers can typecheck against workspace source ([#167](https://github.com/MetaMask/internal-snaps/pull/167))
+
 ## [1.0.0]
 
 ### Added
diff --git a/packages/snap-networks-utils/src/logger/Logger.ts b/packages/snap-networks-utils/src/logger/Logger.ts
index 57230867b..87dce9c41 100644
--- a/packages/snap-networks-utils/src/logger/Logger.ts
+++ b/packages/snap-networks-utils/src/logger/Logger.ts
@@ -128,8 +128,12 @@ export class Logger {
     assert(level, LogLevelStruct);
 
     this.#level = level;
-    this.#prefix = prefix;
-    this.#decorators = decorators;
+    if (prefix !== undefined) {
+      this.#prefix = prefix;
+    }
+    if (decorators !== undefined) {
+      this.#decorators = decorators;
+    }
   }
 
   /**
@@ -146,7 +150,9 @@ export class Logger {
     return new Logger({
       level: this.#level,
       prefix: this.#prefix ? `${this.#prefix} ${prefix}` : prefix,
-      decorators: this.#decorators,
+      ...(this.#decorators === undefined
+        ? {}
+        : { decorators: this.#decorators }),
     });
   }
 
diff --git a/packages/snap-networks-utils/tsconfig.json b/packages/snap-networks-utils/tsconfig.json
index 464677940..081aced0e 100644
--- a/packages/snap-networks-utils/tsconfig.json
+++ b/packages/snap-networks-utils/tsconfig.json
@@ -1,7 +1,6 @@
 {
   "extends": "../../tsconfig.packages.json",
   "compilerOptions": {
-    "baseUrl": "./",
     "skipLibCheck": true,
     "types": ["jest"]
   },
diff --git a/packages/solana-wallet-snap/CHANGELOG.md b/packages/solana-wallet-snap/CHANGELOG.md
index ab6dd1dbf..45931b301 100644
--- a/packages/solana-wallet-snap/CHANGELOG.md
+++ b/packages/solana-wallet-snap/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Resolve workspace `@metamask/*` TypeScript types from the monorepo root instead of assuming sibling directories ([#167](https://github.com/MetaMask/internal-snaps/pull/167))
 - Extract Snap-owned assets domain logic into `SnapAssetsAdapter`; `AssetsService` is a thin facade that delegates metadata, market data, fetch, persist, and account asset reads through the adapter (no Core routing yet). ([#121](https://github.com/MetaMask/internal-snaps/pull/121))
 - Align `AssetsService` read API with `snap-networks-utils` / AssetsController shapes by adding `getAccountAssetByID`, `getAccountAssetsByIDs`, `getAccountAssetsByScope`, and `getAccountAssets`, and routing Keyring and Send through them (still Snap-owned storage). ([#120](https://github.com/MetaMask/internal-snaps/pull/120))
 
diff --git a/packages/solana-wallet-snap/snap.manifest.json b/packages/solana-wallet-snap/snap.manifest.json
index 57d2ca99d..9ec50e91d 100644
--- a/packages/solana-wallet-snap/snap.manifest.json
+++ b/packages/solana-wallet-snap/snap.manifest.json
@@ -7,7 +7,7 @@
     "url": "https://github.com/MetaMask/internal-snaps.git"
   },
   "source": {
-    "shasum": "2c2WNzBfLdP/UYJdepbBVpyYrpjzuSob/iobC9JJRLo=",
+    "shasum": "ogadUr7kiFH3ZTJLvNrBtK3z9EpDy1UGFLA+DSe0XVU=",
     "location": {
       "npm": {
         "filePath": "dist/bundle.js",
diff --git a/packages/solana-wallet-snap/tsconfig.json b/packages/solana-wallet-snap/tsconfig.json
index 3eb63f359..7031f2018 100644
--- a/packages/solana-wallet-snap/tsconfig.json
+++ b/packages/solana-wallet-snap/tsconfig.json
@@ -1,20 +1,19 @@
 {
-  "extends": "../../tsconfig.packages.json",
+  "extends": "../../tsconfig.snaps.json",
   "compilerOptions": {
     "baseUrl": "./",
-    "jsx": "react-jsx",
-    "jsxImportSource": "@metamask/snaps-sdk",
-    "resolveJsonModule": true,
+    "paths": {
+      "@metamask/*": ["../../packages/*/src"],
+      "@metamask/snap-networks-utils/*": [
+        "../../packages/snap-networks-utils/src/*"
+      ]
+    },
+    "lib": ["ES2023", "DOM"],
+    "target": "es2023",
     "exactOptionalPropertyTypes": true,
     "forceConsistentCasingInFileNames": true,
     "noErrorTruncation": true,
-    "noUncheckedIndexedAccess": true,
-    "skipLibCheck": true,
-    "lib": ["ES2023", "DOM"],
-    "target": "es2023",
-    "module": "preserve",
-    "moduleResolution": "bundler",
-    "types": ["jest"]
+    "noUncheckedIndexedAccess": true
   },
   "include": ["**/*.ts", "**/*.tsx", "locales/*.json"]
 }
diff --git a/packages/stellar-wallet-snap/CHANGELOG.md b/packages/stellar-wallet-snap/CHANGELOG.md
index e6268ac1d..eb9eb201f 100644
--- a/packages/stellar-wallet-snap/CHANGELOG.md
+++ b/packages/stellar-wallet-snap/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Resolve workspace `@metamask/*` TypeScript types from the monorepo root instead of assuming sibling directories ([#167](https://github.com/MetaMask/internal-snaps/pull/167))
 - This package was migrated from [snap-stellar-wallet](https://github.com/MetaMask/snap-stellar-wallet). See the source repository for the original [changelog](https://github.com/MetaMask/snap-stellar-wallet/blob/main/packages/snap/CHANGELOG.md) ([#161](https://github.com/MetaMask/internal-snaps/pull/161))
 
 ### Fixed
diff --git a/packages/stellar-wallet-snap/tsconfig.json b/packages/stellar-wallet-snap/tsconfig.json
index df5a8f6b6..797db4496 100644
--- a/packages/stellar-wallet-snap/tsconfig.json
+++ b/packages/stellar-wallet-snap/tsconfig.json
@@ -1,19 +1,12 @@
 {
-  "extends": "../../tsconfig.packages.json",
+  "extends": "../../tsconfig.snaps.json",
   "compilerOptions": {
-    "resolveJsonModule": true /*  lets us import JSON modules from within TypeScript modules. */,
-    "jsx": "react-jsx",
-    "jsxImportSource": "@metamask/snaps-sdk",
+    "lib": ["ES2023", "DOM"],
+    "target": "es2023",
     "exactOptionalPropertyTypes": false,
     "forceConsistentCasingInFileNames": true,
     "noErrorTruncation": true,
-    "noUncheckedIndexedAccess": true,
-    "skipLibCheck": true,
-    "lib": ["ES2023", "DOM"],
-    "target": "es2023",
-    "module": "preserve",
-    "moduleResolution": "bundler",
-    "types": ["jest"]
+    "noUncheckedIndexedAccess": true
   },
   "include": ["**/*.ts", "**/*.tsx", "locales/*.json"]
 }
diff --git a/packages/tron-wallet-snap/CHANGELOG.md b/packages/tron-wallet-snap/CHANGELOG.md
index 733239f5e..678db5766 100644
--- a/packages/tron-wallet-snap/CHANGELOG.md
+++ b/packages/tron-wallet-snap/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Resolve workspace `@metamask/*` TypeScript types from the monorepo root instead of assuming sibling directories ([#167](https://github.com/MetaMask/internal-snaps/pull/167))
 - Extract shared asset util functions and inject `SnapAssetsAdapter` from `context` into `AssetsService` ([#143](https://github.com/MetaMask/internal-snaps/pull/143))
 - Rename `getByKeyringAccountId` to `getAccountAssets` (with essential-asset synthesis) and update keyring callers ([#143](https://github.com/MetaMask/internal-snaps/pull/143))
 
diff --git a/packages/tron-wallet-snap/snap.manifest.json b/packages/tron-wallet-snap/snap.manifest.json
index fe36b7959..317ca5920 100644
--- a/packages/tron-wallet-snap/snap.manifest.json
+++ b/packages/tron-wallet-snap/snap.manifest.json
@@ -7,7 +7,7 @@
     "url": "https://github.com/MetaMask/internal-snaps.git"
   },
   "source": {
-    "shasum": "MbqwOXbHFI83/qWOj9zDSXJizgEt5oQ+QnpHq0g/sls=",
+    "shasum": "Dgq9UwYX7J/Mo+Ubvm4cwZGPlea3fC/CPtq7jJhReec=",
     "location": {
       "npm": {
         "filePath": "dist/bundle.js",
diff --git a/packages/tron-wallet-snap/tsconfig.json b/packages/tron-wallet-snap/tsconfig.json
index df5a8f6b6..797db4496 100644
--- a/packages/tron-wallet-snap/tsconfig.json
+++ b/packages/tron-wallet-snap/tsconfig.json
@@ -1,19 +1,12 @@
 {
-  "extends": "../../tsconfig.packages.json",
+  "extends": "../../tsconfig.snaps.json",
   "compilerOptions": {
-    "resolveJsonModule": true /*  lets us import JSON modules from within TypeScript modules. */,
-    "jsx": "react-jsx",
-    "jsxImportSource": "@metamask/snaps-sdk",
+    "lib": ["ES2023", "DOM"],
+    "target": "es2023",
     "exactOptionalPropertyTypes": false,
     "forceConsistentCasingInFileNames": true,
     "noErrorTruncation": true,
-    "noUncheckedIndexedAccess": true,
-    "skipLibCheck": true,
-    "lib": ["ES2023", "DOM"],
-    "target": "es2023",
-    "module": "preserve",
-    "moduleResolution": "bundler",
-    "types": ["jest"]
+    "noUncheckedIndexedAccess": true
   },
   "include": ["**/*.ts", "**/*.tsx", "locales/*.json"]
 }
diff --git a/scripts/create-package/package-template/tsconfig.json b/scripts/create-package/package-template/tsconfig.json
index 025ba2ef7..fabfb3eca 100644
--- a/scripts/create-package/package-template/tsconfig.json
+++ b/scripts/create-package/package-template/tsconfig.json
@@ -1,8 +1,5 @@
 {
   "extends": "../../tsconfig.packages.json",
-  "compilerOptions": {
-    "baseUrl": "./"
-  },
   "references": [],
   "include": ["../../types", "./src"]
 }
diff --git a/tsconfig.packages.json b/tsconfig.packages.json
index a655abc1f..5710af502 100644
--- a/tsconfig.packages.json
+++ b/tsconfig.packages.json
@@ -5,14 +5,23 @@
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
     /**
-     * Here we ensure that TypeScript resolves `@metamask/*` imports to the
-     * uncompiled source code for packages that live in this repo.
+     * Resolve `@metamask/*` imports to uncompiled source for packages in this
+     * repo. Paths are relative to this file (the monorepo root).
+     *
+     * A local candidate is used only when `packages/<name>/src` exists.
+     * Published `@metamask/*` dependencies fall through to `node_modules`.
+     * TypeScript path patterns allow only one `*`, so workspace packages
+     * with extra entry points need an explicit subpath mapping.
      *
      * NOTE: This must be synchronized with the `moduleNameMapper` option in
-     * `jest.config.packages.js`.
+     * `jest.config.packages.js`. Consuming configs should not set `baseUrl`
+     * unless they also re-declare these paths relative to that `baseUrl`.
      */
     "paths": {
-      "@metamask/*": ["../*/src"]
+      "@metamask/*": ["./packages/*/src"],
+      "@metamask/snap-networks-utils/*": [
+        "./packages/snap-networks-utils/src/*"
+      ]
     }
   }
 }
diff --git a/tsconfig.snaps.json b/tsconfig.snaps.json
new file mode 100644
index 000000000..5019f992c
--- /dev/null
+++ b/tsconfig.snaps.json
@@ -0,0 +1,25 @@
+{
+  /**
+   * Shared TypeScript settings for Snap packages.
+   *
+   * Snaps are bundled with `mm-snap` and are not part of the root
+   * `tsc --build` graph, so `composite` is disabled here. That lets
+   * workspace `@metamask/*` path mappings resolve to sibling `src/`
+   * directories without requiring project-reference build artifacts.
+   *
+   * Do not set `baseUrl` here. Inherited path mappings are resolved
+   * against `baseUrl` when it is present, which would break the
+   * monorepo-root mappings in `tsconfig.packages.json`.
+   */
+  "extends": "./tsconfig.packages.json",
+  "compilerOptions": {
+    "composite": false,
+    "jsx": "react-jsx",
+    "jsxImportSource": "@metamask/snaps-sdk",
+    "module": "preserve",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "types": ["jest"]
+  }
+}