diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 17372937..5d43b00d 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -508,6 +508,9 @@ jobs:
         run: bash scripts/ci/check_pypi_publisher_metadata.sh dist
 
       - name: Prepare generated Python live fixture
+        # The acceptance service is TypeDB 3.12.3, whose semantic profile is 3.12.1.
+        env:
+          TYPE_BRIDGE_ACCEPTANCE_SEMANTIC_PROFILE: typedb-3.12.1/v1
         run: >-
           scripts/ci/prepare_generated_live_fixture.sh python
           tmp/release-generated-python
@@ -908,6 +911,9 @@ jobs:
         run: npm run typecheck:projection-integration
 
       - name: Prepare generated Node live fixture
+        # The acceptance service is TypeDB 3.12.3, whose semantic profile is 3.12.1.
+        env:
+          TYPE_BRIDGE_ACCEPTANCE_SEMANTIC_PROFILE: typedb-3.12.1/v1
         run: >-
           "$GITHUB_WORKSPACE/scripts/ci/prepare_generated_live_fixture.sh" node
           "$GITHUB_WORKSPACE/tmp/release-generated-node"
@@ -1304,6 +1310,8 @@ jobs:
           TYPEDB_ADDRESS: localhost:1729
           TYPEDB_HTTP_PORT: "8000"
           TYPE_BRIDGE_RUST_PROJECTION_INTG_DATABASE: release_rust_projection_live
+          # The service is TypeDB 3.12.3, whose semantic profile is 3.12.1.
+          TYPE_BRIDGE_ACCEPTANCE_SEMANTIC_PROFILE: typedb-3.12.1/v1
           ACCEPTANCE_TARGET_DIR: ${{ runner.temp }}/release-rust-projection-target
         run: >-
           timeout --foreground 15m
@@ -1552,6 +1560,8 @@ jobs:
       - name: Run exact-wheel generated Python application
         env:
           TYPE_BRIDGE_GENERATED_PARITY_REPORT: ${{ runner.temp }}/release-generated-parity.xml
+          # The service is TypeDB 3.12.3, whose semantic profile is 3.12.1.
+          TYPE_BRIDGE_ACCEPTANCE_SEMANTIC_PROFILE: typedb-3.12.1/v1
         run: |
           cd "$RUNNER_TEMP"
           PATH="$RUNNER_TEMP/release-generated-parity/bin:$PATH" \
@@ -1631,6 +1641,10 @@ jobs:
 
       - name: Run exact-package generated Node application
         working-directory: type-bridge-core/crates/node
+        env:
+          # The service is TypeDB 3.12.3, whose semantic profile is 3.12.1.
+          TYPE_BRIDGE_ACCEPTANCE_SEMANTIC_PROFILE: typedb-3.12.1/v1
+          TYPEDB_VERSION: 3.12.3
         run: >-
           node --test --test-concurrency=1
           "$TYPE_BRIDGE_GENERATED_NODE_STAGE/harness/tests/projection-integration/generated-package-live.test.js"
diff --git a/docs/development/performance.md b/docs/development/performance.md
index 0e7b2483..0bbeeefd 100644
--- a/docs/development/performance.md
+++ b/docs/development/performance.md
@@ -88,9 +88,12 @@ runners sit above the comparison noise threshold.
 
 Each iteration builds its plans with the SDK plan builder, stages them on a
 `Transaction`, commits and checks the answers. `type-bridge-perf` (a private
-crate, never a dependency of a shipped crate) installs a `tracing` layer that
-sums the [stage spans](#stage-spans): each span counts its wall time minus
-that of its stage children, so nested stages never count twice.
+crate, never a dependency of a shipped crate) installs the `tracing` layer of
+`type-bridge-perf-stages`, which sums the [stage spans](#stage-spans): each
+span counts its wall time minus that of its stage children, so nested stages
+never count twice. The bindings' off-by-default `perf-stages` feature links
+only that leaf crate, which has no path dependencies, so a binding's source
+archive does not have to carry the SDK.
 Time inside no span is SDK-side work, for example the Rust SDK checking the
 schema package each time it builds a plan.
 
diff --git a/scripts/ci/cargo_release_inventory.py b/scripts/ci/cargo_release_inventory.py
index b4cbe093..c1ba64a9 100644
--- a/scripts/ci/cargo_release_inventory.py
+++ b/scripts/ci/cargo_release_inventory.py
@@ -25,7 +25,7 @@
     }
 )
 # Repository tooling that measures the product; never a dependency of it.
-EXPECTED_PRIVATE_TOOLING = frozenset({"type-bridge-perf"})
+EXPECTED_PRIVATE_TOOLING = frozenset({"type-bridge-perf", "type-bridge-perf-stages"})
 # The one way a package may link tooling: a private binding's optional
 # dependency enabled only by this off-by-default feature.
 PERF_STAGES_FEATURE = "perf-stages"
diff --git a/scripts/ci/cargo_release_inventory.toml b/scripts/ci/cargo_release_inventory.toml
index 1b1f39c9..5e99f42b 100644
--- a/scripts/ci/cargo_release_inventory.toml
+++ b/scripts/ci/cargo_release_inventory.toml
@@ -215,3 +215,11 @@ classification = "private-tooling"
 role = "perf-harness"
 version-policy = "lockstep"
 docs-target = "none"
+
+[[packages]]
+name = "type-bridge-perf-stages"
+manifest = "crates/perf-stages/Cargo.toml"
+classification = "private-tooling"
+role = "perf-harness"
+version-policy = "lockstep"
+docs-target = "none"
diff --git a/scripts/ci/validate_python_release_artifacts.py b/scripts/ci/validate_python_release_artifacts.py
index fb993037..64f0cfe5 100644
--- a/scripts/ci/validate_python_release_artifacts.py
+++ b/scripts/ci/validate_python_release_artifacts.py
@@ -87,12 +87,12 @@
     "vendor/typedb-protocol-b8",
     "vendor/typedb-driver-b8",
 )
-# Maturin 1.14.1 does not discover the optional orm-derive path dependency
+# Maturin 1.14.1 does not discover the optional orm-derive and perf-stages path dependencies
 # while constructing the Python sdist. pyproject.toml therefore includes this
 # source root explicitly. Unlike Cargo-packaged workspace members, the explicit
 # include is copied byte-for-byte: its manifest keeps workspace inheritance,
 # and Cargo resolves license-file to the archive's canonical root LICENSE.
-CORE_SDIST_EXPLICIT_RAW_SOURCE_ROOTS = ("crates/orm-derive",)
+CORE_SDIST_EXPLICIT_RAW_SOURCE_ROOTS = ("crates/orm-derive", "crates/perf-stages")
 CORE_SDIST_SOURCE_ROOTS = (
     CORE_SDIST_WORKSPACE_MEMBERS
     + CORE_SDIST_EXPLICIT_RAW_SOURCE_ROOTS
diff --git a/tests/contracts/c-broad-case-ledger.json b/tests/contracts/c-broad-case-ledger.json
index fac205ac..e231c7eb 100644
--- a/tests/contracts/c-broad-case-ledger.json
+++ b/tests/contracts/c-broad-case-ledger.json
@@ -36,7 +36,7 @@
       "source_commit": "177ce24ac182b94269561c8622e5533d29891a44",
       "authorities": [
         {"path": "tests/contracts/c-artifact-journey-v1.json", "sha256": "76e7057180129fd5e0e7d47a314cb6059c4fc69f99d59942b690e99331b5270f"},
-        {"path": "tests/contracts/c-distribution-v1.json", "sha256": "8c3a9dec2a676dc840ab9a2d89d50e5f01924c15a86d19d1b5e2f3d9c42c3938"}
+        {"path": "tests/contracts/c-distribution-v1.json", "sha256": "b74fa5acfe6eb429777b865d7397b174cac7b5a47be70a4a9778ca39d324fd67"}
       ]
     }
   },
diff --git a/tests/contracts/c-distribution-v1.json b/tests/contracts/c-distribution-v1.json
index 6a7ab9f4..7edbaf77 100644
--- a/tests/contracts/c-distribution-v1.json
+++ b/tests/contracts/c-distribution-v1.json
@@ -241,7 +241,7 @@
   "source_authorities": [
     {
       "path": "type-bridge-core/crates/c/Cargo.toml",
-      "sha256": "c0ca37d12896cd32313b7f3ca65b568d7ead9c1f39c2697f98f6a72178aa354e"
+      "sha256": "a34c60b3e78207c720205312f0e0dc72081dc0ef5fa2e03114cc2f80755db763"
     },
     {
       "path": "type-bridge-core/crates/c/CMakeLists.txt",
diff --git a/tests/unit/compat/test_cargo_release_inventory.py b/tests/unit/compat/test_cargo_release_inventory.py
index 69414171..1ded8f82 100644
--- a/tests/unit/compat/test_cargo_release_inventory.py
+++ b/tests/unit/compat/test_cargo_release_inventory.py
@@ -45,18 +45,21 @@ def test_repository_inventory_closes_every_cargo_product_class() -> None:
 
     assert inventory.release_version == "2.3.0"
     assert inventory.first_party_msrv == "1.88"
-    assert len(inventory.packages) == 23
+    assert len(inventory.packages) == 24
     assert len(inventory.public_packages) == 19
     assert len(inventory.first_party_packages) == 17
     assert len(inventory.immutable_packages) == 2
-    assert len(inventory.private_packages) == 4
+    assert len(inventory.private_packages) == 5
     assert [package.publish_order for package in inventory.public_packages] == list(range(1, 20))
     assert {package.name for package in inventory.binding_packages} == {
         "type-bridge-c",
         "type-bridge-core",
         "type-bridge-node",
     }
-    assert [package.name for package in inventory.tooling_packages] == ["type-bridge-perf"]
+    assert [package.name for package in inventory.tooling_packages] == [
+        "type-bridge-perf",
+        "type-bridge-perf-stages",
+    ]
     assert set(inventory.private_packages) == {
         *inventory.binding_packages,
         *inventory.tooling_packages,
@@ -222,9 +225,7 @@ def test_tooling_dependency_rule_accepts_the_checked_in_manifests() -> None:
     assert inventory_module.tooling_dependency_violations(inventory, workspace) == []
 
 
-PYTHON_PERF_DEPENDENCY = (
-    'type-bridge-perf = { path = "../perf", default-features = false, optional = true }'
-)
+PYTHON_PERF_DEPENDENCY = 'type-bridge-perf-stages = { path = "../perf-stages", default-features = false, optional = true }'
 
 
 @pytest.mark.parametrize(
@@ -233,19 +234,19 @@ def test_tooling_dependency_rule_accepts_the_checked_in_manifests() -> None:
         (
             "crates/orm/Cargo.toml",
             "[dependencies]\n",
-            '[dependencies]\ntype-bridge-perf = { path = "../perf", optional = true }\n',
+            '[dependencies]\ntype-bridge-perf-stages = { path = "../perf-stages", optional = true }\n',
             "only a private binding may link tooling",
         ),
         (
             "crates/python/Cargo.toml",
             PYTHON_PERF_DEPENDENCY,
-            'type-bridge-perf = { path = "../perf", default-features = false }',
+            'type-bridge-perf-stages = { path = "../perf-stages", default-features = false }',
             "must be an optional normal dependency",
         ),
         (
             "crates/python/Cargo.toml",
             PYTHON_PERF_DEPENDENCY,
-            'type-bridge-perf = { path = "../perf", optional = true }',
+            'type-bridge-perf-stages = { path = "../perf-stages", optional = true }',
             "must be an optional normal dependency",
         ),
         (
@@ -257,7 +258,7 @@ def test_tooling_dependency_rule_accepts_the_checked_in_manifests() -> None:
         (
             "crates/python/Cargo.toml",
             "default = []",
-            'default = []\nprofiling = ["type-bridge-perf/pipelines"]',
+            'default = []\nprofiling = ["type-bridge-perf-stages/tracing"]',
             "must be enabled by 'perf-stages' alone",
         ),
     ],
diff --git a/tests/unit/compat/test_python_release_artifact_validator.py b/tests/unit/compat/test_python_release_artifact_validator.py
index 0c4c4046..2edbf7d7 100644
--- a/tests/unit/compat/test_python_release_artifact_validator.py
+++ b/tests/unit/compat/test_python_release_artifact_validator.py
@@ -957,14 +957,13 @@ def test_core_sdist_rejects_non_generated_symbolic_and_nonregular_inputs(
         validator.core_sdist_source_authorities(tmp_path)
 
 
-def test_core_sdist_optional_derive_source_is_an_exact_raw_include() -> None:
-    assert "crates/orm-derive" in validator.CORE_SDIST_SOURCE_ROOTS
-    assert "crates/orm-derive" in validator.CORE_SDIST_EXPLICIT_RAW_SOURCE_ROOTS
-    assert "crates/orm-derive" not in validator.CORE_SDIST_WORKSPACE_MEMBERS
-    assert (
-        "crates/orm-derive/Cargo.toml" not in validator.CORE_SDIST_TRANSFORMED_FIRST_PARTY_MANIFESTS
-    )
-    assert "crates/orm-derive/LICENSE" not in validator.CORE_SDIST_GENERATED_LICENSES
+@pytest.mark.parametrize("root", ["crates/orm-derive", "crates/perf-stages"])
+def test_core_sdist_optional_path_sources_are_exact_raw_includes(root: str) -> None:
+    assert root in validator.CORE_SDIST_SOURCE_ROOTS
+    assert root in validator.CORE_SDIST_EXPLICIT_RAW_SOURCE_ROOTS
+    assert root not in validator.CORE_SDIST_WORKSPACE_MEMBERS
+    assert f"{root}/Cargo.toml" not in validator.CORE_SDIST_TRANSFORMED_FIRST_PARTY_MANIFESTS
+    assert f"{root}/LICENSE" not in validator.CORE_SDIST_GENERATED_LICENSES
 
 
 def test_core_sdist_rejects_changed_raw_optional_derive_manifest(tmp_path: Path) -> None:
diff --git a/tests/unit/compat/test_release_identity_validator.py b/tests/unit/compat/test_release_identity_validator.py
index 30dc25cc..8530abf3 100644
--- a/tests/unit/compat/test_release_identity_validator.py
+++ b/tests/unit/compat/test_release_identity_validator.py
@@ -231,6 +231,7 @@ def test_repository_cargo_graph_is_complete_and_ordered() -> None:
         "type-bridge-core",
         "type-bridge-node",
         "type-bridge-perf",
+        "type-bridge-perf-stages",
     ]
     dependency_order = report["cargo_manifest_dependency_order"]
     assert isinstance(dependency_order, dict)
@@ -263,6 +264,7 @@ def test_repository_cargo_graph_is_complete_and_ordered() -> None:
         "type-bridge-orm",
         "type-bridge-orm-derive",
         "type-bridge-perf",
+        "type-bridge-perf-stages",
         "type-bridge-query",
         "type-bridge-schema",
         "type-bridge-schema-codegen",
diff --git a/tests/unit/compat/test_rust_generated_parity_inventory.py b/tests/unit/compat/test_rust_generated_parity_inventory.py
index e0bab1a9..27ecc33f 100644
--- a/tests/unit/compat/test_rust_generated_parity_inventory.py
+++ b/tests/unit/compat/test_rust_generated_parity_inventory.py
@@ -126,11 +126,24 @@ def test_only_binding_perf_stages_features_depend_on_the_private_perf_harness()
     dependents = sorted(
         manifest.parent.name
         for manifest in (workspace / "crates").glob("*/Cargo.toml")
-        if _depends_on(tomllib.loads(manifest.read_text(encoding="utf-8")), "type-bridge-perf")
+        if _depends_on(
+            tomllib.loads(manifest.read_text(encoding="utf-8")), "type-bridge-perf-stages"
+        )
     )
-    assert dependents == ["c", "node", "python"]
-    perf = tomllib.loads((workspace / "crates/perf/Cargo.toml").read_text(encoding="utf-8"))
-    assert perf["package"]["publish"] is False
+    # The bindings and the pipelines harness, which re-exports the layer.
+    assert dependents == ["c", "node", "perf", "python"]
+    # The bindings link only the stage layer, never the pipelines harness.
+    assert not [
+        manifest.parent.name
+        for manifest in (workspace / "crates").glob("*/Cargo.toml")
+        if manifest.parent.name not in {"perf", "perf-stages"}
+        and _depends_on(tomllib.loads(manifest.read_text(encoding="utf-8")), "type-bridge-perf")
+    ]
+    for crate in ("perf", "perf-stages"):
+        manifest = tomllib.loads(
+            (workspace / f"crates/{crate}/Cargo.toml").read_text(encoding="utf-8")
+        )
+        assert manifest["package"]["publish"] is False
 
 
 def _assert_source_evidence(item: dict[str, Any]) -> None:
diff --git a/tests/unit/infra/test_release_artifact_gates.py b/tests/unit/infra/test_release_artifact_gates.py
index 64c6d2fd..da294fe7 100644
--- a/tests/unit/infra/test_release_artifact_gates.py
+++ b/tests/unit/infra/test_release_artifact_gates.py
@@ -80,6 +80,7 @@ def test_core_sdist_includes_optional_rust_path_dependency() -> None:
         "path": "crates/orm-derive/**/*",
         "format": "sdist",
     } in included
+    assert {"path": "crates/perf-stages/**/*", "format": "sdist"} in included
     assert {"path": "LICENSE", "format": "sdist"} in included
 
 
diff --git a/type-bridge-core/Cargo.lock b/type-bridge-core/Cargo.lock
index de92aad0..06256d3c 100644
--- a/type-bridge-core/Cargo.lock
+++ b/type-bridge-core/Cargo.lock
@@ -3247,7 +3247,7 @@ dependencies = [
  "type-bridge-contract",
  "type-bridge-core-lib",
  "type-bridge-orm",
- "type-bridge-perf",
+ "type-bridge-perf-stages",
  "type-bridge-schema",
  "type-bridge-schema-codegen",
  "type-bridge-schema-migration",
@@ -3304,7 +3304,7 @@ dependencies = [
  "type-bridge-core-lib",
  "type-bridge-migration",
  "type-bridge-orm",
- "type-bridge-perf",
+ "type-bridge-perf-stages",
  "type-bridge-schema",
  "type-bridge-schema-codegen",
  "type-bridge-schema-compat",
@@ -3382,7 +3382,7 @@ dependencies = [
  "type-bridge-contract",
  "type-bridge-core-lib",
  "type-bridge-orm",
- "type-bridge-perf",
+ "type-bridge-perf-stages",
  "type-bridge-schema",
  "type-bridge-schema-codegen",
  "type-bridge-schema-migration",
@@ -3433,16 +3433,24 @@ version = "2.3.0"
 dependencies = [
  "serde_json",
  "tokio",
- "tracing",
- "tracing-subscriber",
  "type-bridge",
  "type-bridge-cli",
  "type-bridge-contract",
  "type-bridge-orm",
+ "type-bridge-perf-stages",
  "type-bridge-schema",
  "type-bridge-schema-codegen",
 ]
 
+[[package]]
+name = "type-bridge-perf-stages"
+version = "2.3.0"
+dependencies = [
+ "tokio",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "type-bridge-query"
 version = "2.3.0"
diff --git a/type-bridge-core/Cargo.toml b/type-bridge-core/Cargo.toml
index c1422b20..1c259549 100644
--- a/type-bridge-core/Cargo.toml
+++ b/type-bridge-core/Cargo.toml
@@ -22,6 +22,7 @@ members = [
     "crates/rust",
     "crates/toml-transpiler",
     "crates/perf",
+    "crates/perf-stages",
     "vendor/typedb-protocol-b8",
     "vendor/typedb-driver-b8",
 ]
diff --git a/type-bridge-core/crates/c/Cargo.toml b/type-bridge-core/crates/c/Cargo.toml
index b0940eef..35cf9d07 100644
--- a/type-bridge-core/crates/c/Cargo.toml
+++ b/type-bridge-core/crates/c/Cargo.toml
@@ -26,13 +26,13 @@ serde_json = "1"
 tokio = { version = "1", features = ["full"] }
 tracing = { version = "0.1", default-features = false, features = ["std"] }
 # Private perf harness; only the off-by-default `perf-stages` feature links it.
-type-bridge-perf = { path = "../perf", default-features = false, optional = true }
+type-bridge-perf-stages = { path = "../perf-stages", default-features = false, optional = true }
 
 [features]
 default = []
 # The private, non-ABI `tb_perf_stages_json` recorder for the perf drivers.
 # Never enabled for shipped archives.
-perf-stages = ["dep:type-bridge-perf"]
+perf-stages = ["dep:type-bridge-perf-stages"]
 
 [dev-dependencies]
 sha2 = "0.10"
diff --git a/type-bridge-core/crates/c/src/perf_stages.rs b/type-bridge-core/crates/c/src/perf_stages.rs
index 3449ff50..1c2818b8 100644
--- a/type-bridge-core/crates/c/src/perf_stages.rs
+++ b/type-bridge-core/crates/c/src/perf_stages.rs
@@ -30,7 +30,7 @@ pub(crate) fn entry() -> tracing::Span {
 #[cfg(feature = "perf-stages")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn tb_perf_stages_json(buffer: *mut u8, capacity: usize) -> usize {
-    let Ok(times) = type_bridge_perf::stages::recorder() else {
+    let Ok(times) = type_bridge_perf_stages::recorder() else {
         return usize::MAX;
     };
     let stages = times.take();
diff --git a/type-bridge-core/crates/node/Cargo.toml b/type-bridge-core/crates/node/Cargo.toml
index 15615dfa..40f39012 100644
--- a/type-bridge-core/crates/node/Cargo.toml
+++ b/type-bridge-core/crates/node/Cargo.toml
@@ -18,7 +18,7 @@ default = []
 contract-test-adapter = []
 # The private `_perfStages()` recorder for the perf drivers. Never enabled
 # for shipped packages.
-perf-stages = ["dep:type-bridge-perf"]
+perf-stages = ["dep:type-bridge-perf-stages"]
 
 [dependencies]
 type-bridge-contract = { path = "../contract", version = "2.3.0" }
@@ -35,7 +35,7 @@ serde_json = "1.0"
 tokio = { version = "1", features = ["rt-multi-thread", "sync"] }
 tracing = { version = "0.1", default-features = false, features = ["std"] }
 # Private perf harness; only the off-by-default `perf-stages` feature links it.
-type-bridge-perf = { path = "../perf", default-features = false, optional = true }
+type-bridge-perf-stages = { path = "../perf-stages", default-features = false, optional = true }
 
 [build-dependencies]
 napi-build = "2"
diff --git a/type-bridge-core/crates/node/src/perf_stages.rs b/type-bridge-core/crates/node/src/perf_stages.rs
index eb94bf46..40a04021 100644
--- a/type-bridge-core/crates/node/src/perf_stages.rs
+++ b/type-bridge-core/crates/node/src/perf_stages.rs
@@ -19,7 +19,7 @@ pub(crate) fn entry() -> tracing::Span {
 #[cfg(feature = "perf-stages")]
 #[napi_derive::napi(js_name = "_perfStages")]
 pub fn perf_stages() -> napi::Result<std::collections::HashMap<String, i64>> {
-    let times = type_bridge_perf::stages::recorder()
+    let times = type_bridge_perf_stages::recorder()
         .map_err(|error| napi::Error::new(napi::Status::GenericFailure, error.to_string()))?;
     Ok(times
         .take()
diff --git a/type-bridge-core/crates/perf-stages/Cargo.toml b/type-bridge-core/crates/perf-stages/Cargo.toml
new file mode 100644
index 00000000..f50fb806
--- /dev/null
+++ b/type-bridge-core/crates/perf-stages/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "type-bridge-perf-stages"
+version = "2.3.0"
+edition = "2024"
+rust-version = "1.88"
+description = "Private perf harness: exclusive wall time per TypeBridge stage span"
+license.workspace = true
+license-file.workspace = true
+repository.workspace = true
+authors.workspace = true
+# The SDK bindings' off-by-default perf-stages feature links this leaf crate;
+# it has no path dependencies, so a binding's source archive stays loadable.
+publish = false
+
+[dependencies]
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", default-features = false, features = ["registry", "std"] }
+
+[dev-dependencies]
+tokio = { version = "1", features = ["rt", "time"] }
+
+[lints]
+workspace = true
diff --git a/type-bridge-core/crates/perf/src/stages.rs b/type-bridge-core/crates/perf-stages/src/lib.rs
similarity index 100%
rename from type-bridge-core/crates/perf/src/stages.rs
rename to type-bridge-core/crates/perf-stages/src/lib.rs
diff --git a/type-bridge-core/crates/perf/Cargo.toml b/type-bridge-core/crates/perf/Cargo.toml
index 387c093d..d6d8a49a 100644
--- a/type-bridge-core/crates/perf/Cargo.toml
+++ b/type-bridge-core/crates/perf/Cargo.toml
@@ -23,8 +23,8 @@ required-features = ["pipelines"]
 
 [features]
 default = ["pipelines"]
-# The Rust pipeline driver. The SDK bindings link only the stage layer
-# (`default-features = false`), so they never pull the SDK or the CLI.
+# The Rust pipeline driver. The SDK bindings link only
+# type-bridge-perf-stages, so they never pull the SDK or the CLI.
 pipelines = [
     "dep:serde_json",
     "dep:tokio",
@@ -37,8 +37,7 @@ pipelines = [
 ]
 
 [dependencies]
-tracing = "0.1"
-tracing-subscriber = { version = "0.3", default-features = false, features = ["registry", "std"] }
+type-bridge-perf-stages = { path = "../perf-stages" }
 serde_json = { version = "1", optional = true }
 tokio = { version = "1", features = ["rt-multi-thread", "time"], optional = true }
 type-bridge = { path = "../rust", optional = true }
diff --git a/type-bridge-core/crates/perf/src/lib.rs b/type-bridge-core/crates/perf/src/lib.rs
index 1a6db3f2..fc1d5f3a 100644
--- a/type-bridge-core/crates/perf/src/lib.rs
+++ b/type-bridge-core/crates/perf/src/lib.rs
@@ -10,4 +10,4 @@
 //!
 //! The crate is never published and no shipped crate depends on it.
 
-pub mod stages;
+pub use type_bridge_perf_stages as stages;
diff --git a/type-bridge-core/crates/python/Cargo.toml b/type-bridge-core/crates/python/Cargo.toml
index 49852573..6f9aeb53 100644
--- a/type-bridge-core/crates/python/Cargo.toml
+++ b/type-bridge-core/crates/python/Cargo.toml
@@ -34,13 +34,13 @@ serde_json = "1.0"
 tokio = { version = "1", features = ["rt-multi-thread"] }
 tracing = { version = "0.1", default-features = false, features = ["std"] }
 # Private perf harness; only the off-by-default `perf-stages` feature links it.
-type-bridge-perf = { path = "../perf", default-features = false, optional = true }
+type-bridge-perf-stages = { path = "../perf-stages", default-features = false, optional = true }
 
 [features]
 default = []
 # The private `_perf_stages()` recorder for the perf drivers. Never enabled
 # for shipped wheels.
-perf-stages = ["dep:type-bridge-perf"]
+perf-stages = ["dep:type-bridge-perf-stages"]
 
 [dev-dependencies]
 sha2 = "0.10"
diff --git a/type-bridge-core/crates/python/src/perf_stages.rs b/type-bridge-core/crates/python/src/perf_stages.rs
index d9724455..d78d3444 100644
--- a/type-bridge-core/crates/python/src/perf_stages.rs
+++ b/type-bridge-core/crates/python/src/perf_stages.rs
@@ -18,8 +18,8 @@ pub(crate) fn entry() -> tracing::Span {
 #[cfg(feature = "perf-stages")]
 #[pyo3::pyfunction]
 fn _perf_stages() -> pyo3::PyResult<std::collections::BTreeMap<&'static str, u64>> {
-    type_bridge_perf::stages::recorder()
-        .map(type_bridge_perf::stages::StageTimes::take)
+    type_bridge_perf_stages::recorder()
+        .map(type_bridge_perf_stages::StageTimes::take)
         .map_err(|error| pyo3::exceptions::PyRuntimeError::new_err(error.to_string()))
 }
 
diff --git a/type-bridge-core/pyproject.toml b/type-bridge-core/pyproject.toml
index c3e20f3f..bfbf704a 100644
--- a/type-bridge-core/pyproject.toml
+++ b/type-bridge-core/pyproject.toml
@@ -29,6 +29,8 @@ include = [
     # Cargo metadata resolves optional path dependencies even when their feature
     # is disabled. Maturin 1.14 no longer discovers this crate automatically.
     { path = "crates/orm-derive/**/*", format = "sdist" },
+    # The perf-stages feature's optional stage-timing crate, for the same reason.
+    { path = "crates/perf-stages/**/*", format = "sdist" },
 ]
 exclude = [
     "python/**/__pycache__/**",