Release v4.18.0 (#1624)

Author: alexmojaki

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Release Notes
 
+## [v4.18.0] (2026-01-12)
+
+* Adds `aiohttp` request body capture. by @adtyavrdhn in [#1595](https://github.com/pydantic/logfire/pull/1595)
+* Claude SDK instrumentation by @alexmojaki in [#1618](https://github.com/pydantic/logfire/pull/1618)
+
 ## [v4.17.0] (2026-01-07)
 
 * `logfire.instrument_surrealdb` by @alexmojaki in [#1573](https://github.com/pydantic/logfire/pull/1573)
@@ -994,3 +999,4 @@ First release from new repo!
 [v4.15.1]: https://github.com/pydantic/logfire/compare/v4.15.0...v4.15.1
 [v4.16.0]: https://github.com/pydantic/logfire/compare/v4.15.1...v4.16.0
 [v4.17.0]: https://github.com/pydantic/logfire/compare/v4.16.0...v4.17.0
+[v4.18.0]: https://github.com/pydantic/logfire/compare/v4.17.0...v4.18.0

logfire-api/logfire_api/_internal/config_params.pyi

@@ -53,6 +53,7 @@ IGNORE_NO_CONFIG: Incomplete
 BASE_URL: Incomplete
 DISTRIBUTED_TRACING: Incomplete
 HTTPX_CAPTURE_ALL: Incomplete
+AIOHTTP_CLIENT_CAPTURE_ALL: Incomplete
 CONFIG_PARAMS: Incomplete
 
 @dataclass

logfire-api/logfire_api/_internal/integrations/aiohttp_client.pyi

@@ -1,6 +1,11 @@
+from _typeshed import Incomplete
 from aiohttp.client_reqrep import ClientResponse
 from aiohttp.tracing import TraceRequestEndParams, TraceRequestExceptionParams, TraceRequestStartParams
+from email.headerregistry import ContentTypeHeader
 from logfire import Logfire as Logfire, LogfireSpan as LogfireSpan
+from logfire._internal.config import GLOBAL_CONFIG as GLOBAL_CONFIG
+from logfire._internal.main import set_user_attributes_on_raw_span as set_user_attributes_on_raw_span
+from logfire._internal.stack_info import warn_at_user_stacklevel as warn_at_user_stacklevel
 from logfire._internal.utils import handle_internal_errors as handle_internal_errors
 from logfire.integrations.aiohttp_client import AioHttpRequestHeaders as AioHttpRequestHeaders, AioHttpResponseHeaders as AioHttpResponseHeaders, RequestHook as RequestHook, ResponseHook as ResponseHook
 from opentelemetry.trace import Span
@@ -9,18 +14,30 @@ from yarl import URL
 
 P = ParamSpec('P')
 
-def instrument_aiohttp_client(logfire_instance: Logfire, capture_response_body: bool, capture_headers: bool, request_hook: RequestHook | None, response_hook: ResponseHook | None, **kwargs: Any) -> None:
+def instrument_aiohttp_client(logfire_instance: Logfire, capture_all: bool | None, capture_request_body: bool, capture_response_body: bool, capture_headers: bool, request_hook: RequestHook | None, response_hook: ResponseHook | None, **kwargs: Any) -> None:
     """Instrument the `aiohttp` module so that spans are automatically created for each client request.
 
     See the `Logfire.instrument_aiohttp_client` method for details.
     """
 
 class LogfireClientInfoMixin:
+    """Mixin providing content-type header parsing for charset detection."""
     headers: AioHttpRequestHeaders
+    @property
+    def content_type_header_object(self) -> ContentTypeHeader:
+        """Parse the Content-Type header into a structured object."""
+    @property
+    def content_type_header_string(self) -> str:
+        """Get the raw Content-Type header value."""
+    @property
+    def content_type_charset(self) -> str:
+        """Extract charset from Content-Type header, defaulting to utf-8."""
 
 class LogfireAioHttpRequestInfo(TraceRequestStartParams, LogfireClientInfoMixin):
     span: Span
     def capture_headers(self) -> None: ...
+    @handle_internal_errors
+    def capture_body_if_text(self, attr_name: str = 'http.request.body.text'): ...
 
 class LogfireAioHttpResponseInfo(LogfireClientInfoMixin):
     span: Span
@@ -37,9 +54,11 @@ class LogfireAioHttpResponseInfo(LogfireClientInfoMixin):
     @classmethod
     def create_from_trace_params(cls, span: Span, params: TraceRequestEndParams | TraceRequestExceptionParams, logfire_instance: Logfire) -> LogfireAioHttpResponseInfo: ...
 
-def make_request_hook(hook: RequestHook | None, capture_headers: bool) -> RequestHook | None: ...
+def make_request_hook(hook: RequestHook | None, capture_headers: bool, capture_request_body: bool) -> RequestHook | None: ...
 def make_response_hook(hook: ResponseHook | None, logfire_instance: Logfire, capture_headers: bool, capture_response_body: bool) -> ResponseHook | None: ...
-def capture_request(span: Span, request: TraceRequestStartParams, capture_headers: bool) -> LogfireAioHttpRequestInfo: ...
+def capture_request(span: Span, request: TraceRequestStartParams, capture_headers: bool, capture_request_body: bool) -> LogfireAioHttpRequestInfo: ...
 def capture_response(span: Span, response: TraceRequestEndParams | TraceRequestExceptionParams, logfire_instance: Logfire, capture_headers: bool, capture_response_body: bool) -> LogfireAioHttpResponseInfo: ...
 def run_hook(hook: Callable[P, Any] | None, *args: P.args, **kwargs: P.kwargs) -> None: ...
 def capture_request_or_response_headers(span: Span, headers: AioHttpRequestHeaders | AioHttpResponseHeaders, request_or_response: Literal['request', 'response']) -> None: ...
+
+CODES_FOR_METHODS_WITH_DATA_OR_JSON_PARAM: Incomplete

logfire-api/logfire_api/_internal/main.pyi

@@ -775,7 +775,7 @@ class Logfire:
         Returns:
             The instrumented WSGI application.
         """
-    def instrument_aiohttp_client(self, *, capture_headers: bool = False, capture_response_body: bool = False, request_hook: AiohttpClientRequestHook | None = None, response_hook: AiohttpClientResponseHook | None = None, **kwargs: Any) -> None:
+    def instrument_aiohttp_client(self, *, capture_all: bool | None = None, capture_headers: bool = False, capture_request_body: bool = False, capture_response_body: bool = False, request_hook: AiohttpClientRequestHook | None = None, response_hook: AiohttpClientResponseHook | None = None, **kwargs: Any) -> None:
         """Instrument the `aiohttp` module so that spans are automatically created for each client request.
 
         Uses the

logfire-api/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "logfire-api"
-version = "4.17.0"
+version = "4.18.0"
 description = "Shim for the Logfire SDK which does nothing unless Logfire is installed"
 authors = [
     { name = "Pydantic Team", email = "[email protected]" },

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "logfire"
-version = "4.17.0"
+version = "4.18.0"
 description = "The best Python observability tool! 🪵🔥"
 requires-python = ">=3.9"
 authors = [