diff --git a/src/application/binary/BinarySessionRecords.ts b/src/application/binary/BinarySessionRecords.ts
index edd9e15cfb..432283b3aa 100644
--- a/src/application/binary/BinarySessionRecords.ts
+++ b/src/application/binary/BinarySessionRecords.ts
@@ -107,9 +107,9 @@ export abstract class BinarySessionRecords {
     return this.#records.exportEvidenceBundle();
   }
 
-  /** Borrow a sealed bundle for complete serialization without cloning retained graphs. */
-  evidenceBundleForSerialization(): EvidenceBundle {
-    return this.#records.evidenceBundleForSerialization();
+  /** Borrow the record owner's immutable bundle for read-only workflows. */
+  immutableEvidenceBundle(): EvidenceBundle {
+    return this.#records.immutableEvidenceBundle();
   }
 
   /** Persist one provider-neutral snapshot under this session's resource owner. */
diff --git a/src/application/investigation/EvidenceLedger.test.ts b/src/application/investigation/EvidenceLedger.test.ts
index 9955801948..9a61df3ad9 100644
--- a/src/application/investigation/EvidenceLedger.test.ts
+++ b/src/application/investigation/EvidenceLedger.test.ts
@@ -138,13 +138,13 @@ describe("evidence ledger recording", () => {
     expect(Reflect.set(detached, "operation", "forged")).toBe(true);
     expect(ledger.record(detached).ok).toBe(false);
     expect(ledger.forAnalysis(evidence.evidence_id)).toBe(borrowed);
-    const snapshot = ledger.forSerialization();
+    const snapshot = ledger.immutableBundle();
     expect(snapshot).toEqual(ledger.export());
     expect(snapshot.records[0]).toBe(borrowed);
     expect(Object.isFrozen(snapshot.records)).toBe(true);
     ledger.clear();
     expect(ledger.forAnalysis(evidence.evidence_id)).toBeUndefined();
-    expect(ledger.forSerialization().records).toEqual([]);
+    expect(ledger.immutableBundle().records).toEqual([]);
     expect(snapshot.records).toEqual([evidence]);
   });
 });
diff --git a/src/application/investigation/EvidenceLedger.ts b/src/application/investigation/EvidenceLedger.ts
index f8c6535fdd..e2dfa2104d 100644
--- a/src/application/investigation/EvidenceLedger.ts
+++ b/src/application/investigation/EvidenceLedger.ts
@@ -187,8 +187,8 @@ export class EvidenceLedger {
     );
   }
 
-  /** Borrow a sealed canonical bundle for serialization without copying its records. */
-  forSerialization(): EvidenceBundle {
+  /** Borrow an authenticated immutable bundle without copying its records. */
+  immutableBundle(): EvidenceBundle {
     return createImmutableEvidenceBundle(
       [...this.#records.values()],
       [...this.#unknownRevisions.values()],
diff --git a/src/application/investigation/InvestigationEvidence.test.ts b/src/application/investigation/InvestigationEvidence.test.ts
new file mode 100644
index 0000000000..571f4bfe5f
--- /dev/null
+++ b/src/application/investigation/InvestigationEvidence.test.ts
@@ -0,0 +1,111 @@
+import { expect, it } from "vitest";
+
+import { createEvidence, type Evidence } from "../../domain/evidence.js";
+import { createEvidenceBundle } from "../../domain/evidenceBundle.js";
+import { InvestigationRecords } from "./InvestigationRecords.js";
+import {
+  investigationEvidenceBundle,
+  investigationEvidenceLookup,
+  resolveInvestigationEvidenceClosure,
+} from "./InvestigationEvidence.js";
+
+const observation = (path: string, links: readonly string[] = []): Evidence =>
+  createEvidence(
+    { path, sha256: "a".repeat(64), format: "elf" },
+    { id: "fixture", name: "Fixture", version: "1" },
+    {
+      operation: "observe",
+      parameters: {},
+      result: { value: "observed" },
+      evidenceLinks: [...links],
+    },
+  );
+
+it.each(["immutable", "detached"] as const)(
+  "reads current metadata through a %s reader while preserving earlier snapshots",
+  (mode) => {
+    const records = new InvestigationRecords();
+    const first = observation("/original");
+    const added = records.recordEvidence(first);
+    if (!added.ok) throw added.error;
+    const reader =
+      mode === "immutable"
+        ? records
+        : {
+            evidenceById: records.evidenceById.bind(records),
+            exportEvidenceBundle: records.exportEvidenceBundle.bind(records),
+          };
+    const lookup = investigationEvidenceLookup(reader);
+    const snapshot = investigationEvidenceBundle(reader);
+    const replacement = observation("/moved");
+    expect(replacement.evidence_id).toBe(first.evidence_id);
+    const merged = records.mergeEvidenceBundle(
+      createEvidenceBundle([replacement]),
+    );
+    if (!merged.ok) throw merged.error;
+    expect(merged.value.metadataChanged).toBe(true);
+    expect(lookup(first.evidence_id)?.subject?.local_path).toBe("/moved");
+    expect(
+      investigationEvidenceBundle(reader).records[0]?.subject?.local_path,
+    ).toBe("/moved");
+    expect(snapshot.records[0]?.subject?.local_path).toBe("/original");
+    if (mode === "immutable") {
+      expect(Object.isFrozen(snapshot.records[0]?.subject)).toBe(true);
+    } else {
+      const subject = snapshot.records[0]?.subject;
+      if (subject === undefined || subject === null)
+        throw new Error("Expected detached subject");
+      subject.local_path = "/caller-edited";
+      expect(lookup(first.evidence_id)?.subject?.local_path).toBe("/moved");
+    }
+    records.clear();
+    expect(lookup(first.evidence_id)).toBeUndefined();
+    expect(investigationEvidenceBundle(reader).records).toEqual([]);
+    expect(snapshot.records).toHaveLength(1);
+  },
+);
+
+it("keeps a selected transitive closure distinct from unrelated records and rejects a missing dependency", () => {
+  const records = new InvestigationRecords();
+  const leaf = observation("/leaf");
+  const middle = observation("/middle", [leaf.evidence_id]);
+  const root = observation("/root", [middle.evidence_id, leaf.evidence_id]);
+  const unrelated = observation("/unrelated", [root.evidence_id]);
+  for (const record of [leaf, middle, root, unrelated]) {
+    const added = records.recordEvidence(record);
+    if (!added.ok) throw added.error;
+  }
+  expect(
+    resolveInvestigationEvidenceClosure(records, [root.evidence_id]),
+  ).toEqual({
+    ok: true,
+    value: [leaf.evidence_id, middle.evidence_id, root.evidence_id].sort(),
+  });
+  records.clear();
+  const added = records.recordEvidence(root);
+  if (!added.ok) throw added.error;
+  expect(
+    resolveInvestigationEvidenceClosure(records, [root.evidence_id]),
+  ).toMatchObject({
+    ok: false,
+    error: { _tag: "EvidenceIntegrityError" },
+  });
+});
+
+it("rejects a lookup that returns another semantic Evidence identity", () => {
+  const record = observation("/source");
+  const selectedId = `ev_${"0".repeat(64)}`;
+  expect(
+    resolveInvestigationEvidenceClosure({ evidenceById: () => record }, [
+      selectedId,
+    ]),
+  ).toMatchObject({
+    ok: false,
+    error: {
+      _tag: "EvidenceIntegrityError",
+      reason: "identity_mismatch",
+      evidenceId: selectedId,
+      actual: record.evidence_id,
+    },
+  });
+});
diff --git a/src/application/investigation/InvestigationEvidence.ts b/src/application/investigation/InvestigationEvidence.ts
new file mode 100644
index 0000000000..3837d554e5
--- /dev/null
+++ b/src/application/investigation/InvestigationEvidence.ts
@@ -0,0 +1,51 @@
+import {
+  resolveEvidenceInput,
+  type EvidenceLookup,
+} from "../EvidenceInputResolver.js";
+import type { EvidenceReader } from "./InvestigationRecordPort.js";
+import type { EvidenceBundle } from "../../domain/evidenceBundle.js";
+import { uniqueSorted } from "../../domain/canonicalOrdering.js";
+import type { EvidenceIntegrityError } from "../../domain/evidenceErrors.js";
+import { ok, type Result } from "../../domain/result.js";
+
+type InvestigationLookup = Pick<
+  EvidenceReader,
+  "evidenceForAnalysis" | "evidenceById"
+>;
+
+/** Prefer owned immutable records; detached-only readers retain their contract. */
+export const investigationEvidenceLookup =
+  (reader: InvestigationLookup): EvidenceLookup =>
+  (id) =>
+    reader.evidenceForAnalysis?.(id) ?? reader.evidenceById(id);
+
+/** Borrow the owner's immutable snapshot for read-only projection or delivery. */
+export const investigationEvidenceBundle = (
+  reader: Pick<
+    EvidenceReader,
+    "immutableEvidenceBundle" | "exportEvidenceBundle"
+  >,
+): EvidenceBundle =>
+  reader.immutableEvidenceBundle?.() ?? reader.exportEvidenceBundle();
+
+/** Follow exact session references without exporting unrelated records or Unknowns. */
+export const resolveInvestigationEvidenceClosure = (
+  reader: InvestigationLookup,
+  seedIds: readonly string[],
+): Result<string[], EvidenceIntegrityError> => {
+  const lookup = investigationEvidenceLookup(reader);
+  const visited = new Set<string>();
+  const pending = [...seedIds];
+  while (pending.length > 0) {
+    const evidenceId = pending.pop();
+    if (evidenceId === undefined || visited.has(evidenceId)) continue;
+    const evidence = resolveEvidenceInput(
+      { kind: "retained-evidence", evidence_id: evidenceId },
+      lookup,
+    );
+    if (!evidence.ok) return evidence;
+    visited.add(evidenceId);
+    pending.push(...evidence.value.evidence_links);
+  }
+  return ok(uniqueSorted([...visited]));
+};
diff --git a/src/application/investigation/InvestigationRecordPort.ts b/src/application/investigation/InvestigationRecordPort.ts
index 2ac18a207b..0ceaf21a64 100644
--- a/src/application/investigation/InvestigationRecordPort.ts
+++ b/src/application/investigation/InvestigationRecordPort.ts
@@ -12,14 +12,14 @@ import type {
 } from "../../domain/residualUnknown.js";
 import type { Result } from "../../domain/result.js";
 
-/** Detached investigation Evidence reads without target execution or lifecycle authority. */
+/** Read-only investigation Evidence access without target execution or lifecycle authority. */
 export interface EvidenceReader {
   hasEvidence(evidenceId: string): boolean;
   evidenceById(evidenceId: string): Evidence | undefined;
   /** Optional immutable analysis read; older adapters can keep detached reads. */
   evidenceForAnalysis?(evidenceId: string): Evidence | undefined;
-  /** Optional immutable bundle snapshot for complete serialization without graph copies. */
-  evidenceBundleForSerialization?(): EvidenceBundle;
+  /** Optional immutable bundle snapshot for read-only workflows and serialization. */
+  immutableEvidenceBundle?(): EvidenceBundle;
   exportEvidenceBundle(): EvidenceBundle;
 }
 
diff --git a/src/application/investigation/InvestigationRecords.ts b/src/application/investigation/InvestigationRecords.ts
index ea6edb46f3..2e0e6d6a98 100644
--- a/src/application/investigation/InvestigationRecords.ts
+++ b/src/application/investigation/InvestigationRecords.ts
@@ -60,9 +60,9 @@ export class InvestigationRecords
     return this.#evidence.export();
   }
 
-  /** Borrow a sealed bundle snapshot for complete JSON serialization. */
-  evidenceBundleForSerialization(): EvidenceBundle {
-    return this.#evidence.forSerialization();
+  /** Borrow an authenticated immutable bundle snapshot without copying its records. */
+  immutableEvidenceBundle(): EvidenceBundle {
+    return this.#evidence.immutableBundle();
   }
 
   /** Atomically merge a bundle and report changes for the owner's post-commit observers. */
diff --git a/src/server/createServer.ts b/src/server/createServer.ts
index a84b2e7fe2..6e647fbbd1 100644
--- a/src/server/createServer.ts
+++ b/src/server/createServer.ts
@@ -95,6 +95,7 @@ import type { CompactInputSchemaPresentation } from "./EvidenceMcpServer.js";
 import { isAbsolute } from "node:path";
 
 import type { BinarySessionPort } from "../application/binary/BinarySessionPort.js";
+import { investigationEvidenceLookup } from "../application/investigation/InvestigationEvidence.js";
 import type { BrowserObservationPort } from "../application/BrowserObservationPort.js";
 import type { BrowserScenarioCapturePort } from "../application/BrowserScenarioCapturePort.js";
 import type { ElectronActiveObservationPort } from "../application/javascript/ElectronActiveObservationPort.js";
@@ -1078,11 +1079,7 @@ const createSessionRecorders = (
   session: BinarySessionPort | undefined,
 ) => ({
   evidenceById:
-    session === undefined
-      ? undefined
-      : (evidenceId: string) =>
-          session.evidenceForAnalysis?.(evidenceId) ??
-          session.evidenceById(evidenceId),
+    session === undefined ? undefined : investigationEvidenceLookup(session),
   activeTarget:
     session === undefined ? undefined : () => session.activeTarget(),
   recordEvidence:
diff --git a/src/server/promptCompletion.ts b/src/server/promptCompletion.ts
index f23b30ce03..ce79439777 100644
--- a/src/server/promptCompletion.ts
+++ b/src/server/promptCompletion.ts
@@ -1,4 +1,3 @@
-import type { EvidenceReader } from "../application/investigation/InvestigationRecordPort.js";
 import { z } from "zod";
 
 import { uniqueSorted } from "../domain/canonicalOrdering.js";
@@ -11,6 +10,8 @@ import { addressedValueSchema } from "../domain/native/nativeInventory.js";
 import { currentMcpRequestSignal } from "./EvidenceMcpServerCore.js";
 import { parseArtifactInventoryEvidence } from "../domain/artifactInventoryEvidence.js";
 import { EvidenceIntegrityError } from "../domain/evidenceErrors.js";
+import type { Evidence } from "../domain/evidence.js";
+import { investigationEvidenceBundle } from "../application/investigation/InvestigationEvidence.js";
 
 const documentListSchema = z.array(z.string().min(1));
 const procedureInventorySchema = z.array(
@@ -171,18 +172,14 @@ const evidenceCandidates = (
 ): readonly string[] => {
   if (session === undefined) return [];
   const candidates: string[] = [];
-  for (const evidence of session.exportEvidenceBundle().records)
+  for (const evidence of investigationEvidenceBundle(session).records)
     candidates.push(...evidenceValues(kind, evidence));
   return candidates;
 };
 
-type LedgerEvidence = ReturnType<
-  EvidenceReader["exportEvidenceBundle"]
->["records"][number];
-
 const evidenceValues = (
   kind: "evidence" | "capture" | "manifest" | "occurrence",
-  evidence: LedgerEvidence,
+  evidence: Evidence,
 ): readonly string[] => {
   if (kind === "evidence") return [evidence.evidence_id];
   if (kind === "capture")
@@ -210,7 +207,7 @@ const artifactInventoryValues = (
   }
 };
 
-const isProcessCaptureEvidence = (evidence: LedgerEvidence): boolean => {
+const isProcessCaptureEvidence = (evidence: Evidence): boolean => {
   const parsed = parseProcessCaptureEvidence(evidence);
   if (parsed.ok) return true;
   switch (parsed.error.kind) {
diff --git a/src/server/registerArtifactComparisonTool.ts b/src/server/registerArtifactComparisonTool.ts
index dcb8501af1..39fc1312e9 100644
--- a/src/server/registerArtifactComparisonTool.ts
+++ b/src/server/registerArtifactComparisonTool.ts
@@ -8,6 +8,7 @@ import { createEvidence } from "../domain/evidence.js";
 import { readEvidence } from "../domain/evidenceValidation.js";
 import { jsonValueSchema } from "../domain/jsonValue.js";
 import { resolveArtifactComparisonEvidence } from "../application/artifacts/ArtifactComparisonEvidence.js";
+import { investigationEvidenceLookup } from "../application/investigation/InvestigationEvidence.js";
 import type { RecordUnknownInput } from "../domain/residualUnknown.js";
 import { recordDerivedEvidence } from "./recordDerivedEvidence.js";
 import { runDerivedOperation } from "./runDerivedOperation.js";
@@ -23,9 +24,7 @@ export const registerArtifactComparisonTool = (
   contract: ReturnType<typeof toolContract<"compare_artifacts">>,
 ): void => {
   const admission = withAdmittedAnalysis({ kind: "session", session });
-  const evidenceById = (evidenceId: string) =>
-    session.evidenceForAnalysis?.(evidenceId) ??
-    session.evidenceById(evidenceId);
+  const evidenceById = investigationEvidenceLookup(session);
   server.registerTool(
     contract.name,
     toolRegistrationOptions(contract),
diff --git a/src/server/registerFunctionComparisonTool.ts b/src/server/registerFunctionComparisonTool.ts
index eabd80f2d4..1f48465d66 100644
--- a/src/server/registerFunctionComparisonTool.ts
+++ b/src/server/registerFunctionComparisonTool.ts
@@ -17,6 +17,7 @@ import { runAdmittedToolOperation } from "./admittedToolOperation.js";
 
 import { compareFunctions } from "../domain/functionComparison.js";
 import { uniqueSorted } from "../domain/canonicalOrdering.js";
+import { investigationEvidenceLookup } from "../application/investigation/InvestigationEvidence.js";
 /** Register explicit Evidence-backed function comparison. */
 export const registerFunctionComparisonTool = (
   server: EvidenceMcpServer,
@@ -36,8 +37,7 @@ export const registerFunctionComparisonTool = (
         async () => {
           const resolved = resolvePairedEvidenceRequest(
             input,
-            (id) =>
-              session.evidenceForAnalysis?.(id) ?? session.evidenceById(id),
+            investigationEvidenceLookup(session),
           );
           if (!resolved.ok)
             return server.delivery.toCallToolResult(resolved, contract);
diff --git a/src/server/registerInvestigationTools.ts b/src/server/registerInvestigationTools.ts
index 0329d991f7..fe1ab7b297 100644
--- a/src/server/registerInvestigationTools.ts
+++ b/src/server/registerInvestigationTools.ts
@@ -1,3 +1,7 @@
+import {
+  investigationEvidenceBundle,
+  resolveInvestigationEvidenceClosure,
+} from "../application/investigation/InvestigationEvidence.js";
 import type { EvidenceMcpServer } from "./EvidenceMcpServer.js";
 
 import type { BinarySessionPort } from "../application/binary/BinarySessionPort.js";
@@ -9,7 +13,6 @@ import { jsonValueSchema } from "../domain/jsonValue.js";
 import { correlateStaticAndRuntime } from "../domain/staticRuntimeCorrelation.js";
 import {
   comparisonClosure,
-  evidenceClosure,
   isIncomplete,
   recordWorkflowEvidence,
 } from "./registerInvestigationTools/helpers.js";
@@ -75,7 +78,10 @@ const registerChangedBehavior = (
         if (!computed.ok)
           return server.delivery.toCallToolResult(computed, contract);
         const { result, comparisonEvidenceIds } = computed.value;
-        const closure = evidenceClosure(session, result.evidence_links);
+        const closure = resolveInvestigationEvidenceClosure(
+          session,
+          result.evidence_links,
+        );
         if (!closure.ok)
           return server.delivery.toCallToolResult(closure, contract);
         const links = closure.value;
@@ -136,7 +142,7 @@ const registerCallPath = (
         contract.name,
         context.mcpReq.signal,
         async () => {
-          const closure = evidenceClosure(
+          const closure = resolveInvestigationEvidenceClosure(
             session,
             input.functions.map(({ evidence_id }) => evidence_id),
           );
@@ -209,7 +215,7 @@ const registerStaticRuntime = (
         contract.name,
         context.mcpReq.signal,
         async () => {
-          const closure = evidenceClosure(
+          const closure = resolveInvestigationEvidenceClosure(
             session,
             comparisonClosure([
               ...input.static_comparisons,
@@ -283,7 +289,7 @@ const registerReconstruction = (
         contract.name,
         context.mcpReq.signal,
         async () => {
-          const owned = session.exportEvidenceBundle();
+          const owned = investigationEvidenceBundle(session);
           const computed = await runDerivedOperation(
             context,
             contract.name,
@@ -292,7 +298,10 @@ const registerReconstruction = (
           if (!computed.ok)
             return server.delivery.toCallToolResult(computed, contract);
           const result = computed.value;
-          const closure = evidenceClosure(session, result.evidence_links);
+          const closure = resolveInvestigationEvidenceClosure(
+            session,
+            result.evidence_links,
+          );
           if (!closure.ok)
             return server.delivery.toCallToolResult(closure, contract);
           const links = closure.value;
diff --git a/src/server/registerInvestigationTools/helpers.ts b/src/server/registerInvestigationTools/helpers.ts
index df3ac3efd4..9d1a8ea0d2 100644
--- a/src/server/registerInvestigationTools/helpers.ts
+++ b/src/server/registerInvestigationTools/helpers.ts
@@ -1,56 +1,23 @@
 import type { BinarySessionPort } from "../../application/binary/BinarySessionPort.js";
 import type { Evidence } from "../../domain/evidence.js";
-import { EvidenceIntegrityError } from "../../domain/evidenceErrors.js";
 import type { AnalysisError } from "../../domain/analysisErrorBase.js";
-import { err, ok, type Result } from "../../domain/result.js";
+import type { Result } from "../../domain/result.js";
 import { recordDerivedEvidence } from "../recordDerivedEvidence.js";
 import { workflowUnknownInput } from "../../application/investigation/WorkflowUnknown.js";
 import type { WorkflowUnknownInput } from "./types.js";
-import { compareUnicodeCodePoints } from "../../domain/unicodeCodePointOrder.js";
+import { uniqueSorted } from "../../domain/canonicalOrdering.js";
 
 export const isIncomplete = (status: string): boolean =>
   status === "unknown" || status === "truncated";
 
 export const comparisonClosure = (comparisons: readonly Evidence[]): string[] =>
-  uniqueIds(
+  uniqueSorted(
     comparisons.flatMap((evidence) => [
       evidence.evidence_id,
       ...evidence.evidence_links,
     ]),
   );
 
-const uniqueIds = (ids: readonly string[]): string[] =>
-  [...new Set(ids)].sort((left, right) =>
-    compareUnicodeCodePoints(left, right),
-  );
-
-export const evidenceClosure = (
-  session: BinarySessionPort,
-  seedIds: readonly string[],
-): Result<string[], EvidenceIntegrityError> => {
-  const records = new Map(
-    session
-      .exportEvidenceBundle()
-      .records.map((evidence) => [evidence.evidence_id, evidence]),
-  );
-  const visited = new Set<string>();
-  const pending = [...seedIds];
-  while (pending.length > 0) {
-    const evidenceId = pending.pop();
-    if (evidenceId === undefined || visited.has(evidenceId)) continue;
-    const evidence = records.get(evidenceId);
-    if (evidence === undefined)
-      return err(
-        new EvidenceIntegrityError(
-          "Investigation input has a dangling Evidence link",
-        ),
-      );
-    visited.add(evidenceId);
-    pending.push(...evidence.evidence_links);
-  }
-  return ok(uniqueIds([...visited]));
-};
-
 export const recordWorkflowEvidence = (
   ...[session, evidence, unresolved, input]: readonly [
     session: BinarySessionPort,
diff --git a/src/server/registerNativeFunctionMatchingTool.ts b/src/server/registerNativeFunctionMatchingTool.ts
index 128f885688..73c8bd6346 100644
--- a/src/server/registerNativeFunctionMatchingTool.ts
+++ b/src/server/registerNativeFunctionMatchingTool.ts
@@ -8,6 +8,7 @@ import { createEvidenceToolHandler } from "./contractToolHandler.js";
 import { toolRegistrationOptions } from "./toolRegistrationOptions.js";
 import { recordSessionEvidenceSources } from "./sessionEvidence.js";
 import { ok } from "../domain/result.js";
+import { investigationEvidenceLookup } from "../application/investigation/InvestigationEvidence.js";
 import type { Logger } from "pino";
 
 /** Bind one named contract to the same retained-Evidence workflow used by CLI. */
@@ -17,8 +18,7 @@ export const registerNativeFunctionMatchingTool = (
   logger: Logger,
 ): void => {
   const contract = toolContract("match_native_functions");
-  const evidenceById = (id: string) =>
-    session.evidenceForAnalysis?.(id) ?? session.evidenceById(id);
+  const evidenceById = investigationEvidenceLookup(session);
   const recordEvidence: BinarySessionPort["recordEvidence"] = (evidence) =>
     session.recordEvidence(evidence);
   const handler = createEvidenceToolHandler(
diff --git a/src/server/registerSessionRecordTools.ts b/src/server/registerSessionRecordTools.ts
index 2b92d67e96..295d31ebbb 100644
--- a/src/server/registerSessionRecordTools.ts
+++ b/src/server/registerSessionRecordTools.ts
@@ -11,6 +11,7 @@ import type { ArtifactResourceScope } from "../artifacts/ArtifactResourceScope.j
 import { err, ok } from "../domain/result.js";
 import { AnalysisCancelledError } from "../domain/analysisErrorCore.js";
 import { inspectEvidenceBundle } from "../application/investigation/InspectEvidenceBundle.js";
+import { investigationEvidenceBundle } from "../application/investigation/InvestigationEvidence.js";
 import { toolRegistrationOptions } from "./toolRegistrationOptions.js";
 import { withAdmittedAnalysis } from "./analysisAdmission.js";
 import { runAdmittedToolOperation } from "./admittedToolOperation.js";
@@ -49,7 +50,7 @@ const registerExportEvidenceTool = ({
     exportContract.name,
     toolRegistrationOptions(exportContract),
     async (input, context) => {
-      const bundle = bundleForSerialization(session);
+      const bundle = investigationEvidenceBundle(session);
       const written = await writeEvidenceBundle(
         bundle,
         input.path,
@@ -82,7 +83,7 @@ const registerSnapshotEvidenceTool = ({
     toolRegistrationOptions(snapshotContract),
     (input) =>
       server.delivery.toCallToolResult(
-        inspectEvidenceBundle(bundleForSerialization(session), input),
+        inspectEvidenceBundle(investigationEvidenceBundle(session), input),
         snapshotContract,
       ),
   );
@@ -116,7 +117,7 @@ const registerImportEvidenceTool = ({
           if (!loaded.ok)
             return server.delivery.toCallToolResult(loaded, importContract);
           const retainedUnknownRevisions = new Set(
-            bundleForSerialization(session).unknowns.map((unknown) =>
+            investigationEvidenceBundle(session).unknowns.map((unknown) =>
               unknownRevisionKey(unknown),
             ),
           );
@@ -136,7 +137,7 @@ const registerImportEvidenceTool = ({
                         unknownRevisionKey(unknown),
                       ),
                   ).length,
-                  total: bundleForSerialization(session).records.length,
+                  total: investigationEvidenceBundle(session).records.length,
                 }),
                 importContract,
               )
@@ -146,9 +147,6 @@ const registerImportEvidenceTool = ({
   );
 };
 
-const bundleForSerialization = (session: BinarySessionPort): EvidenceBundle =>
-  session.evidenceBundleForSerialization?.() ?? session.exportEvidenceBundle();
-
 const unknownRevisionKey = (
   unknown: EvidenceBundle["unknowns"][number],
 ): string => `${unknown.unknown_id}:${String(unknown.revision)}`;