diff --git a/packages/core/src/artifacts/artifacts-lock.ts b/packages/core/src/artifacts/artifacts-lock.ts
index d9dba3e0..726ca9d4 100644
--- a/packages/core/src/artifacts/artifacts-lock.ts
+++ b/packages/core/src/artifacts/artifacts-lock.ts
@@ -1,6 +1,6 @@
 import { open, readFile, rename, unlink } from "node:fs/promises";
 import path from "node:path";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 
 const LOCK_RETRY_DELAY_MS = 50;
 const LOCK_TIMEOUT_MS = 15_000;
@@ -113,7 +113,7 @@ async function acquireLock(lockPath: string, deadline: number): Promise<void> {
       return;
     } catch (error) {
       if ((error as NodeJS.ErrnoException).code !== "EEXIST") {
-        throw error;
+        throw toCaatingaError(error);
       }
 
       owner = await readLockOwner(lockPath);
diff --git a/packages/core/src/artifacts/read-artifacts.ts b/packages/core/src/artifacts/read-artifacts.ts
index eb893fe1..a4fc2cec 100644
--- a/packages/core/src/artifacts/read-artifacts.ts
+++ b/packages/core/src/artifacts/read-artifacts.ts
@@ -1,7 +1,7 @@
 import { readFile } from "node:fs/promises";
 import path from "node:path";
 import { z } from "zod";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import {
   CaatingaArtifactsSchema,
   CURRENT_ARTIFACTS_SCHEMA_VERSION,
@@ -44,6 +44,6 @@ export async function readArtifacts(cwd = process.cwd()): Promise<CaatingaArtifa
       );
     }
 
-    throw error;
+    throw toCaatingaError(error);
   }
 }
diff --git a/packages/core/src/artifacts/write-artifacts.ts b/packages/core/src/artifacts/write-artifacts.ts
index c7149903..8576bac1 100644
--- a/packages/core/src/artifacts/write-artifacts.ts
+++ b/packages/core/src/artifacts/write-artifacts.ts
@@ -2,6 +2,7 @@ import { randomBytes } from "node:crypto";
 import { mkdir, rename, unlink, writeFile } from "node:fs/promises";
 import path from "node:path";
 import type { CaatingaArtifacts } from "./artifact.schema.js";
+import { toCaatingaError } from "../errors/CaatingaError.js";
 
 export async function writeArtifacts(
   artifacts: CaatingaArtifacts,
@@ -18,7 +19,7 @@ export async function writeArtifacts(
     await rename(tmpPath, artifactsPath);
   } catch (error) {
     await unlink(tmpPath).catch(() => undefined);
-    throw error;
+    throw toCaatingaError(error);
   }
 
   return artifactsPath;
diff --git a/packages/core/src/config/load-config.ts b/packages/core/src/config/load-config.ts
index d4f713ed..45870f61 100644
--- a/packages/core/src/config/load-config.ts
+++ b/packages/core/src/config/load-config.ts
@@ -2,7 +2,7 @@ import { access } from "node:fs/promises";
 import path from "node:path";
 import { createJiti } from "jiti";
 import { z } from "zod";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { isDependenciesNotInstalledError } from "./is-dependencies-not-installed-error.js";
 import { CaatingaConfigSchema, type CaatingaConfig } from "./config.schema.js";
 
@@ -47,6 +47,6 @@ export async function loadConfig(options: LoadConfigOptions = {}): Promise<Caati
       );
     }
 
-    throw error;
+    throw toCaatingaError(error);
   }
 }
diff --git a/packages/core/src/contracts/build-contract.ts b/packages/core/src/contracts/build-contract.ts
index 12d9934f..e6fb7af7 100644
--- a/packages/core/src/contracts/build-contract.ts
+++ b/packages/core/src/contracts/build-contract.ts
@@ -1,5 +1,5 @@
 import type { CaatingaConfig } from "../config/config.schema.js";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { checkBinary } from "../shell/check-binary.js";
 import { runCommand } from "../shell/run-command.js";
 import { resolveContract } from "./resolve-contract.js";
@@ -42,7 +42,7 @@ export async function buildContract(options: BuildContractOptions) {
         error
       );
     }
-    throw error;
+    throw toCaatingaError(error);
   }
 
   const wasmPath = await resolveWasmArtifactPath(contract.wasmPath, {
diff --git a/packages/core/src/contracts/build-workspace.ts b/packages/core/src/contracts/build-workspace.ts
index d53fc7f5..e1812c89 100644
--- a/packages/core/src/contracts/build-workspace.ts
+++ b/packages/core/src/contracts/build-workspace.ts
@@ -1,6 +1,6 @@
 import path from "node:path";
 import type { CaatingaConfig } from "../config/config.schema.js";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { checkBinary } from "../shell/check-binary.js";
 import { runCommand } from "../shell/run-command.js";
 import { resolveContract } from "./resolve-contract.js";
@@ -61,7 +61,7 @@ export async function buildWorkspace(options: BuildWorkspaceOptions) {
         error
       );
     }
-    throw error;
+    throw toCaatingaError(error);
   }
 
   const contracts = await Promise.all(
diff --git a/packages/core/src/contracts/estimate-deploy-cost.ts b/packages/core/src/contracts/estimate-deploy-cost.ts
index 76e63cec..7974fd32 100644
--- a/packages/core/src/contracts/estimate-deploy-cost.ts
+++ b/packages/core/src/contracts/estimate-deploy-cost.ts
@@ -1,7 +1,7 @@
 import path from "node:path";
 import { readArtifacts } from "../artifacts/read-artifacts.js";
 import type { CaatingaConfig } from "../config/config.schema.js";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { resolveNetwork } from "../networks/resolve-network.js";
 import { checkBinary } from "../shell/check-binary.js";
 import { runCommand } from "../shell/run-command.js";
@@ -106,7 +106,7 @@ export async function estimateDeployCost(
         error
       );
     }
-    throw error;
+    throw toCaatingaError(error);
   }
 
   const simulateArgs = ["tx", "simulate", "--source-account", source, buildOutput];
diff --git a/packages/core/src/contracts/invoke-contract.ts b/packages/core/src/contracts/invoke-contract.ts
index 1c1d46fc..925856dd 100644
--- a/packages/core/src/contracts/invoke-contract.ts
+++ b/packages/core/src/contracts/invoke-contract.ts
@@ -1,6 +1,6 @@
 import { readArtifacts } from "../artifacts/read-artifacts.js";
 import type { CaatingaConfig } from "../config/config.schema.js";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { resolveNetwork } from "../networks/resolve-network.js";
 import { checkBinary } from "../shell/check-binary.js";
 import { runCommand } from "../shell/run-command.js";
@@ -102,7 +102,7 @@ export async function invokeContract(options: InvokeContractOptions) {
       );
     }
 
-    throw error;
+    throw toCaatingaError(error);
   }
 
   return {
diff --git a/packages/core/src/contracts/resolve-method-args.ts b/packages/core/src/contracts/resolve-method-args.ts
index c6d1d618..69da247b 100644
--- a/packages/core/src/contracts/resolve-method-args.ts
+++ b/packages/core/src/contracts/resolve-method-args.ts
@@ -1,4 +1,4 @@
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { formatNamedCliArgs } from "./format-cli-args.js";
 import { resolveSourceAddress } from "./resolve-source-address.js";
 import type { DeployArgValue } from "./resolve-deploy-args.js";
@@ -59,7 +59,7 @@ export async function resolveMethodArgs(
           error
         );
       }
-      throw error;
+      throw toCaatingaError(error);
     }
   }
 
diff --git a/packages/core/src/contracts/resolve-source-address.ts b/packages/core/src/contracts/resolve-source-address.ts
index bb42c762..1ac7f386 100644
--- a/packages/core/src/contracts/resolve-source-address.ts
+++ b/packages/core/src/contracts/resolve-source-address.ts
@@ -1,4 +1,4 @@
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { checkBinary } from "../shell/check-binary.js";
 import { runCommand } from "../shell/run-command.js";
 import { assertSafeSourceAccount } from "./source-account.js";
@@ -29,7 +29,7 @@ export async function resolveSourceAddress(options: {
         error
       );
     }
-    throw error;
+    throw toCaatingaError(error);
   }
 
   const address = (result.stdout || result.all || "").trim();
diff --git a/packages/core/src/contracts/verify-dependency-contract.ts b/packages/core/src/contracts/verify-dependency-contract.ts
index f985fdab..e038f851 100644
--- a/packages/core/src/contracts/verify-dependency-contract.ts
+++ b/packages/core/src/contracts/verify-dependency-contract.ts
@@ -1,5 +1,5 @@
 import type { CaatingaArtifacts } from "../artifacts/artifact.schema.js";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import type { ResolvedNetwork } from "../networks/resolve-network.js";
 import { runCommand } from "../shell/run-command.js";
 import { buildStellarNetworkArgs } from "../stellar-cli/build-stellar-network-args.js";
@@ -39,7 +39,7 @@ export async function verifyDependencyContract(options: {
       );
     }
 
-    throw error;
+    throw toCaatingaError(error);
   }
 }
 
diff --git a/packages/core/src/errors/to-caatinga-error-wrapping.test.ts b/packages/core/src/errors/to-caatinga-error-wrapping.test.ts
new file mode 100644
index 00000000..5c70be51
--- /dev/null
+++ b/packages/core/src/errors/to-caatinga-error-wrapping.test.ts
@@ -0,0 +1,42 @@
+import { mkdir, mkdtemp, rm } from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { CaatingaError, CaatingaErrorCode } from "./CaatingaError.js";
+import { readArtifacts } from "../artifacts/read-artifacts.js";
+import { createInitialArtifacts, writeArtifacts } from "../artifacts/write-artifacts.js";
+
+// #88: raw NodeJS.ErrnoException errors used to escape core catch blocks
+// untyped. These exercise the converted sites with a real (non-ENOENT,
+// non-SyntaxError) fs failure and assert they now surface as CaatingaError.
+describe("core catch blocks wrap raw errors as CaatingaError (#88)", () => {
+  let tmpDir: string;
+
+  afterEach(async () => {
+    if (tmpDir) {
+      await rm(tmpDir, { recursive: true, force: true });
+    }
+  });
+
+  it("writeArtifacts wraps a raw rename failure", async () => {
+    tmpDir = await mkdtemp(path.join(os.tmpdir(), "caatinga-wrap-"));
+    // A directory at the artifacts path makes the atomic rename fail with a
+    // raw fs error (EISDIR/ENOTEMPTY), not an ENOENT the code handles.
+    await mkdir(path.join(tmpDir, "caatinga.artifacts.json"));
+
+    await expect(writeArtifacts(createInitialArtifacts("app"), tmpDir)).rejects.toBeInstanceOf(
+      CaatingaError
+    );
+  });
+
+  it("readArtifacts wraps a raw read failure", async () => {
+    tmpDir = await mkdtemp(path.join(os.tmpdir(), "caatinga-wrap-"));
+    // Reading the artifacts path when it is a directory throws EISDIR — a raw
+    // error distinct from the ENOENT (missing file) the code returns empty for.
+    await mkdir(path.join(tmpDir, "caatinga.artifacts.json"));
+
+    await expect(readArtifacts(tmpDir)).rejects.toMatchObject({
+      code: CaatingaErrorCode.UNEXPECTED_ERROR,
+    });
+  });
+});
diff --git a/packages/core/src/frontend/sync-frontend-env.ts b/packages/core/src/frontend/sync-frontend-env.ts
index d4a78610..6e5950d8 100644
--- a/packages/core/src/frontend/sync-frontend-env.ts
+++ b/packages/core/src/frontend/sync-frontend-env.ts
@@ -2,7 +2,7 @@ import { mkdir, readFile, writeFile } from "node:fs/promises";
 import path from "node:path";
 import { readArtifacts } from "../artifacts/read-artifacts.js";
 import type { CaatingaConfig } from "../config/config.schema.js";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { resolveNetwork } from "../networks/resolve-network.js";
 
 export type SyncFrontendEnvOptions = {
@@ -35,7 +35,7 @@ async function readExistingEnv(envFile: string): Promise<string | undefined> {
     if ((error as NodeJS.ErrnoException).code === "ENOENT") {
       return undefined;
     }
-    throw error;
+    throw toCaatingaError(error);
   }
 }
 
diff --git a/packages/core/src/stellar-cli/check-stellar-cli-version.ts b/packages/core/src/stellar-cli/check-stellar-cli-version.ts
index 9f3ae244..29c90bca 100644
--- a/packages/core/src/stellar-cli/check-stellar-cli-version.ts
+++ b/packages/core/src/stellar-cli/check-stellar-cli-version.ts
@@ -1,4 +1,4 @@
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { runCommand } from "../shell/run-command.js";
 import {
   evaluateStellarCliCompatibility,
@@ -36,7 +36,7 @@ export async function checkStellarCliVersion(
       );
     }
 
-    throw error;
+    throw toCaatingaError(error);
   }
 
   const version = parseStellarCliVersion(rawOutput);
diff --git a/packages/core/src/templates/create-project-from-template.ts b/packages/core/src/templates/create-project-from-template.ts
index 9143254c..941ec8e0 100644
--- a/packages/core/src/templates/create-project-from-template.ts
+++ b/packages/core/src/templates/create-project-from-template.ts
@@ -1,7 +1,7 @@
 import { cp, lstat, mkdir, readFile, readdir, stat, writeFile } from "node:fs/promises";
 import path from "node:path";
 import { z } from "zod";
-import { CaatingaError, CaatingaErrorCode } from "../errors/CaatingaError.js";
+import { CaatingaError, CaatingaErrorCode, toCaatingaError } from "../errors/CaatingaError.js";
 import { readArtifacts } from "../artifacts/read-artifacts.js";
 import { createInitialArtifacts, writeArtifacts } from "../artifacts/write-artifacts.js";
 import {
@@ -67,7 +67,7 @@ async function ensureArtifacts(targetDir: string, projectName: string): Promise<
       return;
     }
 
-    throw error;
+    throw toCaatingaError(error);
   }
 }
 
@@ -109,7 +109,7 @@ async function readTemplateManifest(templateDir: string): Promise<TemplateManife
       );
     }
 
-    throw error;
+    throw toCaatingaError(error);
   }
 }