diff --git a/src/application/python/PythonPycService.test.ts b/src/application/python/PythonPycService.test.ts
index fb426512e7..e8bba03e2e 100644
--- a/src/application/python/PythonPycService.test.ts
+++ b/src/application/python/PythonPycService.test.ts
@@ -2,6 +2,7 @@ import { expect, it } from "vitest";
 import {
   AnalysisInputError,
   AnalysisCancelledError,
+  AnalysisOutputError,
 } from "../../domain/analysisErrorCore.js";
 import type { PythonPyc } from "../../domain/python/pythonPyc.js";
 import { ok } from "../../domain/result.js";
@@ -105,12 +106,13 @@ it("records the selected artifact and the header plus marshal ranges", async ()
   ]);
 });
 
-it("discards an observation if the caller cancels while the provider completes", async () => {
+it("retains completed pyc Evidence and the opaque caller reason on late cancellation", async () => {
   const controller = new AbortController();
+  const reason = new AnalysisInputError("opaque caller metadata");
   const service = new PythonPycService({
     identity,
     inspect: () => {
-      controller.abort();
+      controller.abort(reason);
       return Promise.resolve(ok(report));
     },
   });
@@ -119,5 +121,54 @@ it("discards an observation if the caller cancels while the provider completes",
     { signal: controller.signal },
   );
   expect(result.ok).toBe(false);
-  if (!result.ok) expect(result.error).toBeInstanceOf(AnalysisCancelledError);
+  if (result.ok) throw new Error("Expected cancellation");
+  expect(result.error).toBeInstanceOf(AnalysisCancelledError);
+  expect(result.error.cause).toBe(reason);
+  expect(result.error.partialObservation).toMatchObject({
+    operation: "inspect_python_pyc",
+    normalized_result: report,
+    subject: { local_path: report.artifact.path },
+  });
+});
+
+it("retains a pre-admission cancellation reason without calling the pyc provider", async () => {
+  const reason = new Error("caller stopped before pyc admission");
+  let calls = 0;
+  const service = new PythonPycService({
+    identity,
+    inspect: async () => {
+      calls++;
+      return ok(report);
+    },
+  });
+  const result = await service.inspect(
+    { path: report.artifact.path },
+    { signal: AbortSignal.abort(reason) },
+  );
+  if (result.ok) throw new Error("Expected cancellation");
+  expect(result.error).toBeInstanceOf(AnalysisCancelledError);
+  expect(result.error.cause).toBe(reason);
+  expect(result.error.partialObservation).toBeUndefined();
+  expect(calls).toBe(0);
+});
+
+it("preserves malformed provider output instead of relabeling it as a late abort", async () => {
+  const controller = new AbortController();
+  const service = new PythonPycService({
+    identity,
+    inspect: async () => {
+      controller.abort(new Error("later caller stop"));
+      return ok({
+        ...report,
+        artifact: { ...report.artifact, path: "/different.pyc" },
+      });
+    },
+  });
+  const result = await service.inspect(
+    { path: report.artifact.path },
+    { signal: controller.signal },
+  );
+  if (result.ok) throw new Error("Expected output failure");
+  expect(result.error).toBeInstanceOf(AnalysisOutputError);
+  expect(result.error.partialObservation).toBeUndefined();
 });
diff --git a/src/application/python/PythonPycService.ts b/src/application/python/PythonPycService.ts
index 464ce83d37..ef04a9de44 100644
--- a/src/application/python/PythonPycService.ts
+++ b/src/application/python/PythonPycService.ts
@@ -14,7 +14,8 @@ import {
   pythonPycSchema,
 } from "../../domain/python/pythonPyc.js";
 import { analysisInputErrorFromIssues } from "../../domain/inputIssueProjection.js";
-import { err, ok, type Result } from "../../domain/result.js";
+import { err, type Result } from "../../domain/result.js";
+import { completeProviderEvidence } from "../ProviderOperationExecution.js";
 
 const OPERATION = "inspect_python_pyc";
 
@@ -31,7 +32,9 @@ export class PythonPycService {
     options?: ExecutionOptions,
   ): Promise<Result<Evidence, AnalysisError>> {
     if (options?.signal?.aborted)
-      return err(new AnalysisCancelledError(OPERATION));
+      return err(
+        new AnalysisCancelledError(OPERATION, { cause: options.signal.reason }),
+      );
     const input = inspectPythonPycInputSchema.safeParse(rawInput);
     if (!input.success)
       return err(
@@ -51,8 +54,6 @@ export class PythonPycService {
       );
     const result = await this.provider.inspect(input.data, options);
     if (!result.ok) return result;
-    if (options?.signal?.aborted)
-      return err(new AnalysisCancelledError(OPERATION));
     const report = pythonPycSchema.safeParse(result.value);
     if (
       !report.success ||
@@ -68,7 +69,7 @@ export class PythonPycService {
         ),
       );
     const value = report.data;
-    return ok(
+    return completeProviderEvidence(
       createEvidence(
         {
           path: value.artifact.path,
@@ -97,6 +98,7 @@ export class PythonPycService {
           ],
         },
       ),
+      options?.signal,
     );
   }
 }
diff --git a/src/python/PythonPycProvider.ts b/src/python/PythonPycProvider.ts
index 112087996c..c291e1b7f1 100644
--- a/src/python/PythonPycProvider.ts
+++ b/src/python/PythonPycProvider.ts
@@ -1,4 +1,8 @@
-import { bindArtifactFileCleanup } from "../artifacts/ArtifactFileOperation.js";
+import {
+  artifactFileCancellationCause,
+  artifactFilePrimaryFailure,
+  bindArtifactFileCleanup,
+} from "../artifacts/ArtifactFileOperation.js";
 import { ArtifactReaderFailure } from "../artifacts/ArtifactReader.js";
 import { readStableArtifact } from "../artifacts/readStableArtifact.js";
 import { ArtifactResourceScope } from "../artifacts/ArtifactResourceScope.js";
@@ -33,11 +37,7 @@ export const PYTHON_PYC_PROVIDER_IDENTITY = {
 
 const OPERATION = "inspect_python_pyc";
 
-const failureForPrimary = (
-  cause: unknown,
-  input: InspectPythonPycInput,
-  signal: AbortSignal | undefined,
-) => {
+const failureForPrimary = (cause: unknown, input: InspectPythonPycInput) => {
   if (cause instanceof AnalysisError) return cause;
   if (cause instanceof ArtifactReaderFailure && cause.reason === "integrity")
     return new AnalysisArtifactChangedError(
@@ -47,8 +47,9 @@ const failureForPrimary = (
       { cause },
     );
   if (cause instanceof ArtifactReaderFailure && cause.reason === "cancelled")
-    return new AnalysisCancelledError(OPERATION, { cause });
-  if (signal?.aborted) return new AnalysisCancelledError(OPERATION, { cause });
+    return new AnalysisCancelledError(OPERATION, {
+      cause: artifactFileCancellationCause(cause),
+    });
   if (cause instanceof PythonPycResourceFailure)
     return new AnalysisResourceConstraintError(
       OPERATION,
@@ -117,12 +118,8 @@ const failureForPrimary = (
   });
 };
 
-const failureFor = (
-  cause: unknown,
-  input: InspectPythonPycInput,
-  signal: AbortSignal | undefined,
-) => {
-  const primary = failureForPrimary(cause, input, signal);
+const failureFor = (cause: unknown, input: InspectPythonPycInput) => {
+  const primary = failureForPrimary(artifactFilePrimaryFailure(cause), input);
   if (!(cause instanceof ArtifactReaderFailure) || cause.cleanup === undefined)
     return primary;
   const cleanup = new ProviderCleanupError(
@@ -168,7 +165,7 @@ export class PythonPycProvider implements PythonPycPort {
         ),
       );
     } catch (cause) {
-      return err(failureFor(cause, input, options?.signal));
+      return err(failureFor(cause, input));
     }
   }
 }
diff --git a/tests/process-global/stableArtifactConsumers.test.ts b/tests/process-global/stableArtifactConsumers.test.ts
index 7e442f00df..6bd07285b9 100644
--- a/tests/process-global/stableArtifactConsumers.test.ts
+++ b/tests/process-global/stableArtifactConsumers.test.ts
@@ -702,6 +702,7 @@ const fileFailureProviders = [
   ["PE certificates", () => new PeCertificatesProvider()],
   ["native exports", () => new NativeExportsProvider()],
   ["BEAM", () => new BeamProvider()],
+  ["Python pyc", () => new PythonPycProvider()],
 ] as const;
 
 const inspectFileFailure = (
@@ -710,6 +711,11 @@ const inspectFileFailure = (
   signal?: AbortSignal,
 ) => {
   const options = signal === undefined ? undefined : { signal };
+  if (provider instanceof PythonPycProvider)
+    return provider.inspect(
+      inspectPythonPycInputSchema.parse({ path }),
+      options,
+    );
   if (provider instanceof ElfNotesProvider)
     return provider.inspect(
       inspectElfNotesInputSchema.parse({ path }),
@@ -846,3 +852,39 @@ it.each(
     }
   },
 );
+
+it.each([false, true])(
+  "preserves a pyc permission failure through late cancellation (failed close: %s)",
+  async (failedClose) => {
+    const path = await selectedImage();
+    const provider = new PythonPycProvider();
+    const controller = new AbortController();
+    const physical = Object.assign(new Error("pyc descriptor stat denied"), {
+      code: "EACCES",
+    });
+    fault.blockNew = failedClose;
+    fault.readFailure = { cause: physical };
+    fault.onClose = () => controller.abort(physical);
+    try {
+      const result = await provider.inspect(
+        inspectPythonPycInputSchema.parse({ path }),
+        { signal: controller.signal },
+      );
+      if (result.ok) throw new Error("Expected physical read failure");
+      const primary = result.error.cleanupPrimary ?? result.error;
+      expect(primary).toBeInstanceOf(AnalysisAccessDeniedError);
+      expect(primary.cause).toBe(physical);
+      expect(result.error.cleanupIncomplete).toBe(failedClose);
+      expect(fault.handles).toHaveLength(1);
+      expect(fault.handles[0]!.fd >= 0).toBe(failedClose);
+      fault.blocked.clear();
+      await provider.close();
+      expect(result.error.cleanupIncomplete).toBe(false);
+      expect(fault.handles[0]!.fd).toBe(-1);
+    } finally {
+      fault.onClose = undefined;
+      fault.blocked.clear();
+      await provider.close();
+    }
+  },
+);