Release v4.9.0 (#1422)

Author: Kludex

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Release Notes
 
+## [v4.9.0] (2025-09-22)
+
+* Fix Root Model Not Rendering As Expected by @dhruv-ahuja in [#1396](https://github.com/pydantic/logfire/pull/1396)
+* Use `=` instead of `:` in codex setup by @Kludex in [#1420](https://github.com/pydantic/logfire/pull/1420)
+* Add support for OpenCode on the `prompt` command by @Kludex in [#1421](https://github.com/pydantic/logfire/pull/1421)
+
 ## [v4.8.0] (2025-09-18)
 
 * Allow capturing headers and response body with `logfire.instrument_aiohttp_client()` by @adtyavrdhn in [#1405](https://github.com/pydantic/logfire/pull/1405) and [#1409](https://github.com/pydantic/logfire/pull/1409)
@@ -906,3 +912,4 @@ First release from new repo!
 [v4.6.0]: https://github.com/pydantic/logfire/compare/v4.5.0...v4.6.0
 [v4.7.0]: https://github.com/pydantic/logfire/compare/v4.6.0...v4.7.0
 [v4.8.0]: https://github.com/pydantic/logfire/compare/v4.7.0...v4.8.0
+[v4.9.0]: https://github.com/pydantic/logfire/compare/v4.8.0...v4.9.0

logfire-api/logfire_api/_internal/cli/prompt.pyi

@@ -1,6 +1,8 @@
 import argparse
 from logfire._internal.client import LogfireClient as LogfireClient
 from logfire.exceptions import LogfireConfigError as LogfireConfigError
+from rich.console import Console
+from typing import Any
 
 LOGFIRE_MCP_TOML: str
 
@@ -9,3 +11,8 @@ def parse_prompt(args: argparse.Namespace) -> None:
 
     The prompt assumes you are using Logfire MCP.
     """
+def configure_claude(client: LogfireClient, organization: str, project: str, console: Console) -> None: ...
+def configure_codex(client: LogfireClient, organization: str, project: str, console: Console) -> None: ...
+def configure_opencode(client: LogfireClient, organization: str, project: str, console: Console) -> None: ...
+def logfire_mcp_json(token: str) -> dict[str, Any]: ...
+def opencode_mcp_json(token: str) -> dict[str, Any]: ...

logfire-api/logfire_api/_internal/main.pyi

@@ -593,7 +593,17 @@ class Logfire:
         [`opentelemetry-instrumentation-google-genai`](https://pypi.org/project/opentelemetry-instrumentation-google-genai/)
         package, to which it passes `**kwargs`.
         """
-    def instrument_litellm(self, **kwargs: Any): ...
+    def instrument_litellm(self, **kwargs: Any):
+        """Instrument the [LiteLLM](https://docs.litellm.ai/) Python SDK.
+
+        !!! warning
+            This currently works best if all arguments of instrumented methods are passed as keyword arguments,
+            e.g. `litellm.completion(model=model, messages=messages)`.
+
+        Uses the `LiteLLMInstrumentor().instrument()` method of the
+        [`openinference-instrumentation-litellm`](https://pypi.org/project/openinference-instrumentation-litellm/)
+        package, to which it passes `**kwargs`.
+        """
     def instrument_print(self) -> AbstractContextManager[None]:
         """Instrument the built-in `print` function so that calls to it are logged.
 

logfire-api/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "logfire-api"
-version = "4.8.0"
+version = "4.9.0"
 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 = "4.8.0"
+version = "4.9.0"
 description = "The best Python observability tool! 🪵🔥"
 requires-python = ">=3.9"
 authors = [