diff --git a/src/dotnet/ManagedStaticProvider.ts b/src/dotnet/ManagedStaticProvider.ts
index d456455a20..eda9a5458f 100644
--- a/src/dotnet/ManagedStaticProvider.ts
+++ b/src/dotnet/ManagedStaticProvider.ts
@@ -23,6 +23,7 @@ import {
   AnalysisCancelledError,
   AnalysisCapabilityUnavailableError,
   AnalysisInputError,
+  AnalysisUnsupportedTargetError,
 } from "../domain/analysisErrorCore.js";
 import { EvidenceIntegrityError } from "../domain/evidenceErrors.js";
 import { ProviderAdapterError } from "../domain/providerAdapterError.js";
@@ -85,11 +86,13 @@ class ManagedStaticClient implements AnalysisClient {
           "Operation is not implemented by the managed static provider.",
         ),
       );
+    // A non-PE target is outside this operation's formats, not a missing
+    // provider capability; the unimplemented-operation refusal above is.
     if (this.target.format !== "pe")
       return err(
-        new AnalysisCapabilityUnavailableError(
-          MANAGED_STATIC_PROVIDER.id,
+        new AnalysisUnsupportedTargetError(
           operation,
+          this.target.path,
           `Managed static triage requires a PE target; observed ${this.target.format}.`,
         ),
       );
diff --git a/tests/acceptance/managedCliOutput.test.ts b/tests/acceptance/managedCliOutput.test.ts
index ed96e5eab7..cefb178e0f 100644
--- a/tests/acceptance/managedCliOutput.test.ts
+++ b/tests/acceptance/managedCliOutput.test.ts
@@ -3,6 +3,7 @@ import { join } from "node:path";
 
 import { expect } from "vitest";
 
+import { elf, thinMach } from "../../src/domain/binaryTarget.fixture.js";
 import { buildManagedPeFixture } from "../../src/dotnet/ManagedPe.fixture.js";
 import { createTestTempDirectory } from "../fixtures/temporaryDirectory.js";
 import { cliTest } from "../support/cli/cliFixture.js";
@@ -418,3 +419,39 @@ cliTest(
     }
   },
 );
+
+cliTest(
+  "managed CLI refuses non-PE executables as unsupported targets",
+  async ({ cli }) => {
+    const root = await createTestTempDirectory("rea-managed-non-pe-");
+    for (const [name, bytes, format] of [
+      ["native.elf", elf(2, 1, 0x3e), "elf"],
+      ["native.macho", thinMach(0xfeedfacf, 0x01000007), "mach-o"],
+    ] as const) {
+      const path = join(root, name);
+      await writeFile(path, bytes);
+      for (const command of [
+        "inspect-managed-artifact",
+        "inspect-managed-members",
+        "inspect-managed-native-boundaries",
+      ]) {
+        const result = await cli.run({ arguments: [command, path, "--json"] });
+        expect(result.exitCode).not.toBe(0);
+        expect(result.json).toMatchObject({
+          code: "unsupported_target",
+          category: "unsupported_target",
+          retryable: false,
+          remediation: {
+            action:
+              "Select a target supported by this operation or choose an operation supporting the reported target format.",
+          },
+          details: {
+            operation: command.replaceAll("-", "_"),
+            path,
+            reason: `Managed static triage requires a PE target; observed ${format}.`,
+          },
+        });
+      }
+    }
+  },
+);
diff --git a/tests/boundary/mcp/managedMcp.test.ts b/tests/boundary/mcp/managedMcp.test.ts
index d2e414a55e..fb082fb72d 100644
--- a/tests/boundary/mcp/managedMcp.test.ts
+++ b/tests/boundary/mcp/managedMcp.test.ts
@@ -20,6 +20,7 @@ import { toolContract } from "../../../src/contracts/toolContracts.js";
 import { ManagedStaticProvider } from "../../../src/dotnet/ManagedStaticProvider.js";
 import { createServer } from "../../../src/server/createServer.js";
 import { buildManagedPeFixture } from "../../../src/dotnet/ManagedPe.fixture.js";
+import { elf } from "../../../src/domain/binaryTarget.fixture.js";
 
 type ManagedOutputAssertion = Awaited<ReturnType<typeof createOutputAssertion>>;
 
@@ -89,6 +90,20 @@ it("runs every managed static inspection independently of an active native targe
       arguments: { path: join(directory, "missing.dll") },
     });
     expect(invalidSelection.isError).toBe(true);
+    const nativePath = join(directory, "native.elf");
+    await writeFile(nativePath, elf(2, 1, 0x3e));
+    expect(
+      parseMcpToolError(
+        await client.callTool({
+          name: "inspect_managed_artifact",
+          arguments: { path: nativePath },
+        }),
+      ).error,
+    ).toMatchObject({
+      code: "unsupported_target",
+      category: "unsupported_target",
+      details: { operation: "inspect_managed_artifact", path: nativePath },
+    });
     const members = structured(
       await client.callTool({ name: "inspect_managed_members", arguments: {} }),
     );
diff --git a/tests/boundary/providers/managed/managedStaticProvider.test.ts b/tests/boundary/providers/managed/managedStaticProvider.test.ts
index eaabc9c30b..562dec2bd2 100644
--- a/tests/boundary/providers/managed/managedStaticProvider.test.ts
+++ b/tests/boundary/providers/managed/managedStaticProvider.test.ts
@@ -275,7 +275,12 @@ describe("managed static provider path boundary", () => {
       nativeClient.execute("inspect_managed_artifact", {}),
     ).resolves.toMatchObject({
       ok: false,
-      error: { _tag: "AnalysisCapabilityUnavailableError" },
+      error: {
+        _tag: "AnalysisUnsupportedTargetError",
+        operation: "inspect_managed_artifact",
+        path: parsed.value.path,
+        reason: "Managed static triage requires a PE target; observed elf.",
+      },
     });
   });