diff --git a/sdk/typescript/_bundled_plugin/scripts/finalize_scan_contract.py b/sdk/typescript/_bundled_plugin/scripts/finalize_scan_contract.py
index 0d545f27..b56b87d4 100644
--- a/sdk/typescript/_bundled_plugin/scripts/finalize_scan_contract.py
+++ b/sdk/typescript/_bundled_plugin/scripts/finalize_scan_contract.py
@@ -1115,19 +1115,59 @@ def _populate_unsealed_manifest_envelope(
 
     target = scan.get("target")
     if isinstance(target, dict):
-        _populate_unsealed_target_binding(target, completion_binding["target"])
+        _populate_unsealed_target_binding(
+            target,
+            completion_binding["target"],
+            completion_binding.get("allowedTargetKinds"),
+        )
 
     scope = scan.get("scope")
     if isinstance(scope, dict):
         scope.update(copy.deepcopy(completion_binding["scope"]))
 
 
+def _populate_unsealed_target_kind(
+    target: dict[str, Any],
+    target_binding: dict[str, Any],
+    allowed_kinds: Any,
+) -> None:
+    """Adopt the registered target kind when the binding owns every coordinate it needs.
+
+    The scan prompt tells the agent to copy CODEX_SECURITY_TARGET_KIND verbatim rather
+    than infer the kind from the checkout, because only the workbench knows how the
+    target was registered. A draft that infers it anyway used to discard the whole
+    completed scan at the seal step. A clean worktree is the common way to hit this:
+    the workbench registers it as git_revision, while the checkout still looks like a
+    worktree to the agent. The kind carries no draft-owned information when the
+    registration allows a single value, so take that value instead of failing.
+
+    Rewriting the kind also reinterprets the coordinates that kind requires, and a
+    coordinate the binding does not own survives the replacement below with whatever the
+    draft computed under its own reading of the target. A commit or range diff is the
+    case that matters: the workbench registers git_diff but authors no snapshotDigest,
+    so adopting the kind would seal a whole-worktree or directory digest as the diff
+    digest. Leave the kind alone whenever the binding cannot restate every coordinate
+    the registered kind requires, and let the binding check reject the draft instead.
+    """
+
+    if not isinstance(allowed_kinds, list) or len(allowed_kinds) != 1:
+        return
+    registered_kind = allowed_kinds[0]
+    if not isinstance(registered_kind, str) or target.get("kind") == registered_kind:
+        return
+    if not TARGET_REQUIRED_COORDINATE_FIELDS.get(registered_kind, set()) <= target_binding.keys():
+        return
+    target["kind"] = registered_kind
+
+
 def _populate_unsealed_target_binding(
     target: dict[str, Any],
     target_binding: dict[str, Any],
+    allowed_kinds: Any = None,
 ) -> None:
     """Replace workbench-owned target coordinates without retaining incompatible drafts."""
 
+    _populate_unsealed_target_kind(target, target_binding, allowed_kinds)
     target_kind = target.get("kind")
     required_coordinates = (
         TARGET_REQUIRED_COORDINATE_FIELDS.get(target_kind, set())
diff --git a/sdk/typescript/tests-ts/scan-recovery.test.ts b/sdk/typescript/tests-ts/scan-recovery.test.ts
index 77d93cd8..c3ad41d7 100644
--- a/sdk/typescript/tests-ts/scan-recovery.test.ts
+++ b/sdk/typescript/tests-ts/scan-recovery.test.ts
@@ -117,7 +117,12 @@ async function workbench(fixture: ScanFixture, args: readonly string[]) {
 }
 
 async function startDraftScan(
-  repositoryKind: "directory" | "clean" | "dirty" | "nested" = "directory",
+  repositoryKind:
+    | "directory"
+    | "clean"
+    | "dirty"
+    | "nested"
+    | "range-diff" = "directory",
 ): Promise<ScanFixture> {
   const root = await realpath(
     await mkdtemp(join(tmpdir(), "codex-security-scan-recovery-")),
@@ -155,6 +160,27 @@ async function startDraftScan(
     if (repositoryKind === "dirty") {
       await writeFile(join(target, "src", "extract.py"), "# changed fixture\n");
     }
+    if (repositoryKind === "range-diff") {
+      await writeFile(join(target, "src", "extract.py"), "# second fixture\n");
+      for (const args of [
+        ["-C", target, "add", "--", "src/extract.py"],
+        [
+          "-C",
+          target,
+          "-c",
+          "user.name=Codex Security",
+          "-c",
+          "user.email=codex-security@example.invalid",
+          "commit",
+          "--quiet",
+          "-m",
+          "fixture change",
+        ],
+      ]) {
+        const result = spawnSync("git", args, { encoding: "utf8" });
+        expect(result.status, result.stderr).toBe(0);
+      }
+    }
     if (repositoryKind === "nested") {
       const nested = join(target, "nested");
       await mkdir(nested);
@@ -185,7 +211,10 @@ async function startDraftScan(
       config: {},
       mode: "standard",
       repository: target,
-      target: { kind: "repository", paths: [] },
+      target:
+        repositoryKind === "range-diff"
+          ? { kind: "refs", paths: [], base: "HEAD~1", head: "HEAD" }
+          : { kind: "repository", paths: [] },
     }),
   ]);
   fixture.scanId = String(registration["scanId"]);
@@ -209,7 +238,9 @@ async function startDraftScan(
       ? "directory_snapshot"
       : repositoryKind === "clean"
         ? "git_revision"
-        : "git_worktree";
+        : repositoryKind === "range-diff"
+          ? "git_diff"
+          : "git_worktree";
   delete manifest.scan.sealedAt;
   delete manifest.scan.artifacts;
   await writeJson(manifestPath, manifest);
@@ -315,6 +346,117 @@ describe("malformed scan artifact recovery", () => {
     }
   });
 
+  test("seals a clean worktree draft that inferred the worktree target kind", async () => {
+    const fixture = await startDraftScan("clean");
+    const manifestPath = join(fixture.scanDir, "scan-manifest.json");
+    const draft = await readJson<{
+      scan: { target: { kind: string; snapshotDigest?: string } };
+    }>(manifestPath);
+    draft.scan.target.kind = "git_worktree";
+    draft.scan.target.snapshotDigest = `codex-security-snapshot/v1:sha256:${"a".repeat(64)}`;
+    await writeJson(manifestPath, draft);
+    const revision = spawnSync(
+      "git",
+      ["-C", fixture.repository, "rev-parse", "HEAD"],
+      { encoding: "utf8" },
+    );
+    expect(revision.status, revision.stderr).toBe(0);
+
+    const completed = await completeScan(fixture);
+
+    expect(completed.progress.status).toBe("complete");
+    const sealed = await readJson<{
+      scan: { target: { kind: string; revision: string } };
+    }>(manifestPath);
+    expect(sealed.scan.target.kind).toBe("git_revision");
+    expect(sealed.scan.target.revision).toBe(revision.stdout.trim());
+    expect(sealed.scan.target).not.toHaveProperty("snapshotDigest");
+  });
+
+  test("seals a dirty worktree draft that inferred the revision target kind", async () => {
+    const fixture = await startDraftScan("dirty");
+    const manifestPath = join(fixture.scanDir, "scan-manifest.json");
+    const draft = await readJson<{
+      scan: { target: { kind: string; snapshotDigest?: string } };
+    }>(manifestPath);
+    draft.scan.target.kind = "git_revision";
+    draft.scan.target.snapshotDigest = `codex-security-snapshot/v1:sha256:${"a".repeat(64)}`;
+    await writeJson(manifestPath, draft);
+    const registered = (
+      fixture.registration["contract"] as {
+        target: { requiredSnapshotDigest: string };
+      }
+    ).target.requiredSnapshotDigest;
+
+    const completed = await completeScan(fixture);
+
+    expect(completed.progress.status).toBe("complete");
+    const sealed = await readJson<{
+      scan: { target: { kind: string; snapshotDigest: string } };
+    }>(manifestPath);
+    expect(sealed.scan.target.kind).toBe("git_worktree");
+    expect(sealed.scan.target.snapshotDigest).toBe(registered);
+  });
+
+  test("rejects a range diff draft whose inferred kind kept an unbindable digest", async () => {
+    const fixture = await startDraftScan("range-diff");
+    const manifestPath = join(fixture.scanDir, "scan-manifest.json");
+    const draft = await readJson<{
+      scan: { target: { kind: string; snapshotDigest?: string } };
+    }>(manifestPath);
+    draft.scan.target.kind = "git_worktree";
+    draft.scan.target.snapshotDigest = `codex-security-snapshot/v1:sha256:${"b".repeat(64)}`;
+    await writeJson(manifestPath, draft);
+
+    await expect(completeScan(fixture)).rejects.toThrow(
+      "scan.target.kind: must match the workbench target",
+    );
+    expect(
+      (
+        await readJson<{ scan: { target: { snapshotDigest?: string } } }>(
+          manifestPath,
+        )
+      ).scan.target.snapshotDigest,
+    ).toBe(`codex-security-snapshot/v1:sha256:${"b".repeat(64)}`);
+  });
+
+  test("seals a range diff draft that reported the registered diff kind", async () => {
+    const fixture = await startDraftScan("range-diff");
+    const manifestPath = join(fixture.scanDir, "scan-manifest.json");
+    const draft = await readJson<{
+      scan: { target: { snapshotDigest: string } };
+    }>(manifestPath);
+    const digest = draft.scan.target.snapshotDigest;
+    const revisions = spawnSync(
+      "git",
+      ["-C", fixture.repository, "rev-parse", "HEAD~1", "HEAD"],
+      { encoding: "utf8" },
+    );
+    expect(revisions.status, revisions.stderr).toBe(0);
+    const revisionList = revisions.stdout.trim().split("\n");
+    const base = revisionList[0]!;
+    const head = revisionList[1]!;
+
+    const completed = await completeScan(fixture);
+
+    expect(completed.progress.status).toBe("complete");
+    const sealed = await readJson<{
+      scan: {
+        target: {
+          kind: string;
+          baseRevision: string;
+          headRevision: string;
+          snapshotDigest: string;
+        };
+      };
+    }>(manifestPath);
+    expect(sealed.scan.target.kind).toBe("git_diff");
+    expect(sealed.scan.target.baseRevision).toBe(base);
+    expect(sealed.scan.target.headRevision).toBe(head);
+    expect(sealed.scan.target.snapshotDigest).toBe(digest);
+    expect(sealed.scan.target).not.toHaveProperty("revision");
+  });
+
   test("seals a prepared scan without publishing it before acceptance", async () => {
     const fixture = await startDraftScan();