diff --git a/src/contracts/reverseEngineeringToolContracts.ts b/src/contracts/reverseEngineeringToolContracts.ts
index 39d45fb899..8c31e875e3 100644
--- a/src/contracts/reverseEngineeringToolContracts.ts
+++ b/src/contracts/reverseEngineeringToolContracts.ts
@@ -39,7 +39,7 @@ export const REVERSE_ENGINEERING_TOOL_CONTRACTS = [
     ...toolContractMetadata("execute_rizin_command"),
     kind: "native-provider",
     description:
-      "Run one caller-selected Rizin command on a local artifact. Commands/plugins can execute code, mutate files, access network and read outside the artifact; those external inputs are not Evidence-bound. Suppresses user settings/scripts but retains plugins. Raw stdout/stderr is authoritative, JSON is command-specific, and UTF-8 loss/truncation is explicit; output-limit termination leaves completion unknown. For raw images, asm_arch/asm_bits/asm_cpu select decoding and base_address maps offset 0; base_address also passes -n to skip loaders even on ELF, without REA confirming either. An admitted command retires shared binary analysis: close Ghidra explicitly first, then open_binary after effects settle. command_timeout_ms is per-phase and max_output_bytes bounds combined output (16 MiB default); both apply next call without restart and do not raise client receive limits or persistent debugger deadlines.",
+      "Run one caller-selected Rizin command on a local artifact. Commands/plugins can execute code, mutate files, access network and read outside the artifact; those external inputs are not Evidence-bound. Suppresses user settings/scripts but retains plugins. completion_status reports process completion; Rizin can reject a command and exit with code 0. Inspect stdout/stderr before treating empty output as absence. Raw stdout/stderr is authoritative, JSON is command-specific, and UTF-8 loss/truncation is explicit; output-limit termination leaves completion unknown. For raw images, asm_arch/asm_bits/asm_cpu select decoding and base_address maps offset 0; base_address also passes -n to skip loaders even on ELF, without REA confirming either. An admitted command retires shared binary analysis: close Ghidra explicitly first, then open_binary after effects settle. command_timeout_ms is per-phase and max_output_bytes bounds combined output (16 MiB default); both apply next call without restart and do not raise client receive limits or persistent debugger deadlines.",
     inputSchema: rizinInputSchema,
     outputSchema: evidenceResultOf(commandObservationSchema),
     examples: [
diff --git a/src/rizin/RizinCommand.ts b/src/rizin/RizinCommand.ts
index 7ed8566054..9273cdf3b9 100644
--- a/src/rizin/RizinCommand.ts
+++ b/src/rizin/RizinCommand.ts
@@ -21,10 +21,11 @@ export const rizinCommand = (input: RizinInput): readonly string[] => [
   absoluteCallerPath(input.path),
 ];
 
-/** What REA cannot attest about the decoder and map inputs it passed to Rizin. */
+/** What REA cannot attest about command outcomes and selected decoder/map inputs. */
 export const rizinCommandLimitations = (
   input: RizinInput,
 ): readonly string[] => [
+  "completion_status reports process completion. Command validity remains unverified: Rizin can reject a command while returning exit_code 0. Inspect stdout and stderr before treating an empty response as absence.",
   ...(input.asm_arch === undefined &&
   input.asm_bits === undefined &&
   input.asm_cpu === undefined
diff --git a/tests/acceptance/rizinCommandOutcomes.test.ts b/tests/acceptance/rizinCommandOutcomes.test.ts
new file mode 100644
index 0000000000..f3c774af55
--- /dev/null
+++ b/tests/acceptance/rizinCommandOutcomes.test.ts
@@ -0,0 +1,89 @@
+import { createHash } from "node:crypto";
+import { chmod, writeFile } from "node:fs/promises";
+import { join } from "node:path";
+import { expect } from "vitest";
+import { REVERSE_ENGINEERING_TOOL_CONTRACTS } from "../../src/contracts/reverseEngineeringToolContracts.js";
+import { rizinCommandLimitations } from "../../src/rizin/RizinCommand.js";
+import { createTestTempDirectory } from "../fixtures/temporaryDirectory.js";
+import { connectLocalToolsMcp } from "../fixtures/localToolsMcp.js";
+import { cliTest } from "../support/cli/cliFixture.js";
+
+const outcomes = [
+  {
+    command: "axffj",
+    stdout: "",
+    stderr: "ERROR: Command 'axffj' does not exist.\n",
+  },
+  { command: "q", stdout: "", stderr: "" },
+  {
+    command: "echo diagnostic",
+    stdout: "ERROR: Command 'axffj' does not exist.\n",
+    stderr: "WARNING: fixture warning\n",
+  },
+] as const;
+
+cliTest.skipIf(process.platform === "win32").for(outcomes)(
+  "preserves process facts and exposes command-validity uncertainty: $command",
+  async (outcome, { cli }) => {
+    const root = await createTestTempDirectory("rea-rizin-command-outcomes-");
+    const provider = join(root, "rizin-fixture");
+    const artifact = join(root, "artifact.bin");
+    const content = "caller-selected inert artifact";
+    await writeFile(artifact, content);
+    // Real Node subprocesses simulate producer output; they are not Rizin.
+    await writeFile(
+      provider,
+      `#!${process.execPath}\n` +
+        `const cases=${JSON.stringify(outcomes)};\n` +
+        "const selected=cases.find(item=>item.command===process.argv[process.argv.indexOf('-c')+1]);\n" +
+        "if(!selected)process.exit(99);\n" +
+        "process.stdout.write(selected.stdout);process.stderr.write(selected.stderr);\n",
+    );
+    await chmod(provider, 0o755);
+    const environment = { REA_RIZIN_COMMAND: provider };
+    const response = await cli.run({
+      arguments: ["execute-rizin-command", artifact, outcome.command, "--json"],
+      environment,
+    });
+    expect(response.exitCode, `${response.stdout}\n${response.stderr}`).toBe(0);
+    const { client, call } = await connectLocalToolsMcp(environment);
+    const definition = (await client.listTools()).tools.find(
+      ({ name }) => name === "execute_rizin_command",
+    );
+    const mcp = await call("execute_rizin_command", {
+      path: artifact,
+      command: outcome.command,
+    });
+    expect(mcp.isError, JSON.stringify(mcp.content)).not.toBe(true);
+    const contract = REVERSE_ENGINEERING_TOOL_CONTRACTS.find(
+      ({ name }) => name === "execute_rizin_command",
+    );
+    if (!contract) throw new Error("Missing execute_rizin_command contract");
+    const limitations = rizinCommandLimitations({
+      path: artifact,
+      command: outcome.command,
+    });
+    // Even unqualified commands must disclose the provider validity gap.
+    expect(limitations).not.toHaveLength(0);
+    for (const raw of [response.json, mcp.structuredContent]) {
+      const evidence = contract.outputSchema.parse(raw);
+      expect(evidence.normalized_result).toMatchObject({
+        stdout: outcome.stdout,
+        stderr: outcome.stderr,
+        exit_code: 0,
+        completion_status: "complete",
+        output_truncated: false,
+        artifact_changed: false,
+      });
+      expect(evidence.raw_result).toEqual(evidence.normalized_result);
+      expect(evidence.subject?.digest.sha256).toBe(
+        createHash("sha256").update(content).digest("hex"),
+      );
+      expect(evidence.parameters.command).toBe(outcome.command);
+      expect(evidence.limitations).toEqual(
+        expect.arrayContaining([...limitations]),
+      );
+    }
+    expect(definition?.description).toBe(contract.description);
+  },
+);
diff --git a/tests/composition/reverseEngineering.test.ts b/tests/composition/reverseEngineering.test.ts
index ff7fc18e01..e5480ff776 100644
--- a/tests/composition/reverseEngineering.test.ts
+++ b/tests/composition/reverseEngineering.test.ts
@@ -404,7 +404,11 @@ it("marks signal-terminated provider commands as unknown completion", async () =
           /files.*network.*outside the selected artifact.*not bound to Evidence/iu,
         ),
       );
-      expect(ordinaryExit.value.limitations).toHaveLength(4);
+      expect(ordinaryExit.value.limitations).toEqual(
+        expect.arrayContaining([
+          ...rizinCommandLimitations({ path, command: "iI" }),
+        ]),
+      );
     }
   } finally {
     await rm(directory, { recursive: true, force: true });
@@ -476,7 +480,11 @@ describe("Rizin command service", () => {
           /files.*network.*outside the selected artifact.*not bound to Evidence/iu,
         ),
       );
-      expect(result.value.limitations).toHaveLength(4);
+      expect(result.value.limitations).toEqual(
+        expect.arrayContaining([
+          ...rizinCommandLimitations({ path: callerPath, command }),
+        ]),
+      );
       expect(result.value.parameters).toMatchObject({
         path: callerPath,
         command,
@@ -611,15 +619,15 @@ it("passes decoder and map inputs to Rizin before the path and records them", as
     expect(result.value.limitations).toEqual(
       expect.arrayContaining([...rizinCommandLimitations(input)]),
     );
-    // One statement for the decoder inputs and one for the raw map.
-    expect(rizinCommandLimitations(input)).toHaveLength(2);
+    // Command validity stays unverified independently of decoder/map inputs.
+    expect(rizinCommandLimitations(input)).toHaveLength(3);
     expect(
       rizinCommandLimitations({ path, command: "pi 1", asm_bits: 16 }),
-    ).toHaveLength(1);
+    ).toHaveLength(2);
     expect(
       rizinCommandLimitations({ path, command: "pi 1", base_address: "0x0" }),
-    ).toHaveLength(1);
-    expect(rizinCommandLimitations({ path, command: "pi 1" })).toEqual([]);
+    ).toHaveLength(2);
+    expect(rizinCommandLimitations({ path, command: "pi 1" })).toHaveLength(1);
   } finally {
     await rm(directory, { recursive: true, force: true });
   }