release: 0.85.0

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v5
         with:
-          version: '0.9.13'
+          version: '0.10.2'
 
       - name: Install dependencies
         run: uv sync --all-extras
@@ -46,7 +46,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v5
         with:
-          version: '0.9.13'
+          version: '0.10.2'
 
       - name: Install dependencies
         run: uv sync --all-extras
@@ -55,14 +55,18 @@ jobs:
         run: uv build
 
       - name: Get GitHub OIDC Token
-        if: github.repository == 'stainless-sdks/anthropic-python'
+        if: |-
+          github.repository == 'stainless-sdks/anthropic-python' &&
+          !startsWith(github.ref, 'refs/heads/stl/')
         id: github-oidc
         uses: actions/github-script@v8
         with:
           script: core.setOutput('github_token', await core.getIDToken());
 
       - name: Upload tarball
-        if: github.repository == 'stainless-sdks/anthropic-python'
+        if: |-
+          github.repository == 'stainless-sdks/anthropic-python' &&
+          !startsWith(github.ref, 'refs/heads/stl/')
         env:
           URL: https://pkg.stainless.com/s
           AUTH: ${{ steps.github-oidc.outputs.github_token }}
@@ -80,7 +84,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v5
         with:
-          version: '0.9.13'
+          version: '0.10.2'
 
       - name: Bootstrap
         run: ./scripts/bootstrap

.github/workflows/detect-breaking-changes.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v5
         with:
-          version: '0.9.13'
+          version: '0.10.2'
       - name: Install dependencies
         run: uv sync --all-extras
       - name: Detect removed symbols

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "0.84.0"
+  ".": "0.85.0"
 }

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 34
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/anthropic%2Fanthropic-60fbf504538934c934f523d456bbf3cd99e7f1e2275041f74d5beb627bf38e19.yml
-openapi_spec_hash: 58021ab18daccd5c45a930ffd7d6ab4d
-config_hash: bf86c14604e5705bfb2f351adf702c02
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/anthropic%2Fanthropic-7fce94a3c9f72c1d81df2009682a3b554e4b641b32443fd7c1f09f566420f711.yml
+openapi_spec_hash: ae7e30bb8d093b5546cdc2b180f7b8e0
+config_hash: 32f037e4bc66dfaca12016b0e5110140

CHANGELOG.md

@@ -1,5 +1,30 @@
 # Changelog
 
+## 0.85.0 (2026-03-16)
+
+Full Changelog: [v0.84.0...v0.85.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.84.0...v0.85.0)
+
+### Features
+
+* **api:** chore(config): clean up model enum list ([#31](https://github.com/anthropics/anthropic-sdk-python/issues/31)) ([cce1a5b](https://github.com/anthropics/anthropic-sdk-python/commit/cce1a5b9e6fce4f269cec42803f37ce5e2ac2f76))
+* **api:** GA thinking-display-setting ([207340c](https://github.com/anthropics/anthropic-sdk-python/commit/207340cc621855928f53e8ddd58f216ac0d8150d))
+* **tests:** update mock server ([7dc86a4](https://github.com/anthropics/anthropic-sdk-python/commit/7dc86a4ffc9e70533a58065496c78394c6a6e97a))
+
+
+### Bug Fixes
+
+* **client:** add missing 413 and 529 error handlers to async client ([#1554](https://github.com/anthropics/anthropic-sdk-python/issues/1554)) ([9c2986f](https://github.com/anthropics/anthropic-sdk-python/commit/9c2986fb9c046b4cffa1b03ca8762f9c9dea0bab))
+* **tool runner:** propagate container_id for programmatic tool calling ([#1462](https://github.com/anthropics/anthropic-sdk-python/issues/1462)) ([3ae7ff6](https://github.com/anthropics/anthropic-sdk-python/commit/3ae7ff6ff7af8a881706ae8068b1040a23c96fbd))
+* **tools:** use filtered messages list in async compaction ([#1124](https://github.com/anthropics/anthropic-sdk-python/issues/1124)) ([710d666](https://github.com/anthropics/anthropic-sdk-python/commit/710d666f80b7667e3551c1a68d7c0ffaad115de1))
+
+
+### Chores
+
+* **ci:** bump uv version ([09656ac](https://github.com/anthropics/anthropic-sdk-python/commit/09656acef77fa459d30d811bd51aa780a567182b))
+* **internal:** codegen related update ([c9e9fc2](https://github.com/anthropics/anthropic-sdk-python/commit/c9e9fc240334fc466426646d7acd64904f881a80))
+* **internal:** codegen related update ([77f77d1](https://github.com/anthropics/anthropic-sdk-python/commit/77f77d19b4657a7ad0d31de42504c25cf4ed76ef))
+* **tests:** unskip tests that are now supported in steady ([827330b](https://github.com/anthropics/anthropic-sdk-python/commit/827330b527b4af299af084752a7317b0596956af))
+
 ## 0.84.0 (2026-02-25)
 
 Full Changelog: [v0.83.0...v0.84.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.83.0...v0.84.0)

CONTRIBUTING.md

@@ -89,7 +89,7 @@ $ pip install ./path-to-wheel-file.whl
 
 ## Running tests
 
-Most tests require you to [set up a mock server](https://github.com/stoplightio/prism) against the OpenAPI spec to run the tests.
+Most tests require you to [set up a mock server](https://github.com/dgellow/steady) against the OpenAPI spec to run the tests.
 
 ```sh
 $ ./scripts/mock

api.md

@@ -161,6 +161,7 @@ from anthropic.types import (
     WebFetchBlockParam,
     WebFetchTool20250910,
     WebFetchTool20260209,
+    WebFetchTool20260309,
     WebFetchToolResultBlock,
     WebFetchToolResultBlockParam,
     WebFetchToolResultErrorBlock,
@@ -453,6 +454,7 @@ from anthropic.types.beta import (
     BetaWebFetchBlockParam,
     BetaWebFetchTool20250910,
     BetaWebFetchTool20260209,
+    BetaWebFetchTool20260309,
     BetaWebFetchToolResultBlock,
     BetaWebFetchToolResultBlockParam,
     BetaWebFetchToolResultErrorBlock,

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "anthropic"
-version = "0.84.0"
+version = "0.85.0"
 description = "The official Python library for the anthropic API"
 dynamic = ["readme"]
 license = "MIT"

scripts/mock

@@ -19,23 +19,34 @@ fi
 
 echo "==> Starting mock server with URL ${URL}"
 
-# Run prism mock on the given spec
+# Run steady mock on the given spec
 if [ "$1" == "--daemon" ]; then
-  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock "$URL" &> .prism.log &
+  # Pre-install the package so the download doesn't eat into the startup timeout
+  npm exec --package=@stdy/cli@0.19.3 -- steady --version
 
-  # Wait for server to come online
+  npm exec --package=@stdy/cli@0.19.3 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-query-object-format=brackets "$URL" &> .stdy.log &
+
+  # Wait for server to come online via health endpoint (max 30s)
   echo -n "Waiting for server"
-  while ! grep -q "✖  fatal\|Prism is listening" ".prism.log" ; do
+  attempts=0
+  while ! curl --silent --fail "http://127.0.0.1:4010/_x-steady/health" >/dev/null 2>&1; do
+    if ! kill -0 $! 2>/dev/null; then
+      echo
+      cat .stdy.log
+      exit 1
+    fi
+    attempts=$((attempts + 1))
+    if [ "$attempts" -ge 300 ]; then
+      echo
+      echo "Timed out waiting for Steady server to start"
+      cat .stdy.log
+      exit 1
+    fi
     echo -n "."
     sleep 0.1
   done
 
-  if grep -q "✖  fatal" ".prism.log"; then
-    cat .prism.log
-    exit 1
-  fi
-
   echo
 else
-  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock "$URL"
+  npm exec --package=@stdy/cli@0.19.3 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-query-object-format=brackets "$URL"
 fi

scripts/test

@@ -9,8 +9,8 @@ GREEN='\033[0;32m'
 YELLOW='\033[0;33m'
 NC='\033[0m' # No Color
 
-function prism_is_running() {
-  curl --silent "http://localhost:4010" >/dev/null 2>&1
+function steady_is_running() {
+  curl --silent "http://127.0.0.1:4010/_x-steady/health" >/dev/null 2>&1
 }
 
 kill_server_on_port() {
@@ -25,7 +25,7 @@ function is_overriding_api_base_url() {
   [ -n "$TEST_API_BASE_URL" ]
 }
 
-if ! is_overriding_api_base_url && ! prism_is_running ; then
+if ! is_overriding_api_base_url && ! steady_is_running ; then
   # When we exit this script, make sure to kill the background mock server process
   trap 'kill_server_on_port 4010' EXIT
 
@@ -36,19 +36,19 @@ fi
 if is_overriding_api_base_url ; then
   echo -e "${GREEN}✔ Running tests against ${TEST_API_BASE_URL}${NC}"
   echo
-elif ! prism_is_running ; then
-  echo -e "${RED}ERROR:${NC} The test suite will not run without a mock Prism server"
+elif ! steady_is_running ; then
+  echo -e "${RED}ERROR:${NC} The test suite will not run without a mock Steady server"
   echo -e "running against your OpenAPI spec."
   echo
   echo -e "To run the server, pass in the path or url of your OpenAPI"
-  echo -e "spec to the prism command:"
+  echo -e "spec to the steady command:"
   echo
-  echo -e "  \$ ${YELLOW}npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock path/to/your.openapi.yml${NC}"
+  echo -e "  \$ ${YELLOW}npm exec --package=@stdy/cli@0.19.3 -- steady path/to/your.openapi.yml --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-query-object-format=brackets${NC}"
   echo
 
   exit 1
 else
-  echo -e "${GREEN}✔ Mock prism server is running with your OpenAPI spec${NC}"
+  echo -e "${GREEN}✔ Mock steady server is running with your OpenAPI spec${NC}"
   echo
 fi
 

src/anthropic/_client.py

@@ -513,12 +513,18 @@ def _make_status_error(
         if response.status_code == 409:
             return _exceptions.ConflictError(err_msg, response=response, body=body)
 
+        if response.status_code == 413:
+            return _exceptions.RequestTooLargeError(err_msg, response=response, body=body)
+
         if response.status_code == 422:
             return _exceptions.UnprocessableEntityError(err_msg, response=response, body=body)
 
         if response.status_code == 429:
             return _exceptions.RateLimitError(err_msg, response=response, body=body)
 
+        if response.status_code == 529:
+            return _exceptions.OverloadedError(err_msg, response=response, body=body)
+
         if response.status_code >= 500:
             return _exceptions.InternalServerError(err_msg, response=response, body=body)
         return APIStatusError(err_msg, response=response, body=body)

src/anthropic/_version.py

@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "anthropic"
-__version__ = "0.84.0"  # x-release-please-version
+__version__ = "0.85.0"  # x-release-please-version

src/anthropic/lib/tools/_beta_functions.py

@@ -32,10 +32,12 @@ class ToolError(Exception):
 
     Example::
 
-        raise ToolError([
-            {"type": "text", "text": "Error details here"},
-            {"type": "image", "source": {"type": "base64", "data": "...", "media_type": "image/png"}},
-        ])
+        raise ToolError(
+            [
+                {"type": "text", "text": "Error details here"},
+                {"type": "image", "source": {"type": "base64", "data": "...", "media_type": "image/png"}},
+            ]
+        )
     """
 
     content: BetaFunctionToolResultType
@@ -55,6 +57,7 @@ def __init__(self, content: BetaFunctionToolResultType) -> None:
         super().__init__(message)
         self.content = content
 
+
 Function = Callable[..., BetaFunctionToolResultType]
 FunctionT = TypeVar("FunctionT", bound=Function)
 

src/anthropic/lib/tools/_beta_runner.py

@@ -117,7 +117,9 @@ def append_messages(self, *messages: BetaMessageParam | ParsedBetaMessage[Respon
             for message in messages
         ]
         self._messages_modified = True
-        self.set_messages_params(lambda params: {**params, "messages": [*self._params["messages"], *message_params]})
+        self.set_messages_params(
+            lambda params: {**params, "messages": [*params["messages"], *message_params]}
+        )
         self._cached_tool_call_response = None
 
     def _should_stop(self) -> bool:
@@ -255,6 +257,11 @@ def __run__(self) -> Iterator[RunnerItemT]:
                 message = self._get_last_message()
                 assert message is not None
 
+                # Update container from response for programmatic tool calling support
+                last_assistant_message = self._get_last_assistant_message()
+                if last_assistant_message is not None and last_assistant_message.container is not None:
+                    self._params["container"] = last_assistant_message.container.id
+
             self._iteration_count += 1
 
             # If the compaction was performed, skip tool call generation this iteration
@@ -356,12 +363,19 @@ def _get_last_message(self) -> ParsedBetaMessage[ResponseFormatT] | None:
             return self._last_message()
         return self._last_message
 
-    def _get_last_assistant_message_content(self) -> list[ParsedBetaContentBlock[ResponseFormatT]] | None:
+    def _get_last_assistant_message(self) -> ParsedBetaMessage[ResponseFormatT] | None:
         last_message = self._get_last_message()
         if last_message is None or last_message.role != "assistant" or not last_message.content:
             return None
 
-        return last_message.content
+        return last_message
+
+    def _get_last_assistant_message_content(self) -> list[ParsedBetaContentBlock[ResponseFormatT]] | None:
+        last_assistant_message = self._get_last_assistant_message()
+        if last_assistant_message is None:
+            return None
+
+        return last_assistant_message.content
 
 
 class BetaToolRunner(BaseSyncToolRunner[ParsedBetaMessage[ResponseFormatT], ResponseFormatT]):
@@ -469,7 +483,7 @@ async def _check_and_compact(self) -> bool:
                 messages.pop()
 
         messages = [
-            *self._params["messages"],
+            *messages,
             BetaMessageParam(
                 role="user",
                 content=self._compaction_control.get("summary_prompt", DEFAULT_SUMMARY_PROMPT),
@@ -515,6 +529,11 @@ async def __run__(self) -> AsyncIterator[RunnerItemT]:
                 message = await self._get_last_message()
                 assert message is not None
 
+                # Update container from response for programmatic tool calling support
+                last_assistant_message = await self._get_last_assistant_message()
+                if last_assistant_message is not None and last_assistant_message.container is not None:
+                    self._params["container"] = last_assistant_message.container.id
+
             self._iteration_count += 1
 
             # If the compaction was performed, skip tool call generation this iteration
@@ -560,12 +579,19 @@ async def _get_last_message(self) -> ParsedBetaMessage[ResponseFormatT] | None:
             return await self._last_message()
         return self._last_message
 
-    async def _get_last_assistant_message_content(self) -> list[ParsedBetaContentBlock[ResponseFormatT]] | None:
+    async def _get_last_assistant_message(self) -> ParsedBetaMessage[ResponseFormatT] | None:
         last_message = await self._get_last_message()
         if last_message is None or last_message.role != "assistant" or not last_message.content:
             return None
 
-        return last_message.content
+        return last_message
+
+    async def _get_last_assistant_message_content(self) -> list[ParsedBetaContentBlock[ResponseFormatT]] | None:
+        last_assistant_message = await self._get_last_assistant_message()
+        if last_assistant_message is None:
+            return None
+
+        return last_assistant_message.content
 
     async def _generate_tool_call_response(self) -> BetaMessageParam | None:
         content = await self._get_last_assistant_message_content()

src/anthropic/types/__init__.py

@@ -139,6 +139,7 @@
 from .tool_search_tool_result_error import ToolSearchToolResultError as ToolSearchToolResultError
 from .web_fetch_tool_20250910_param import WebFetchTool20250910Param as WebFetchTool20250910Param
 from .web_fetch_tool_20260209_param import WebFetchTool20260209Param as WebFetchTool20260209Param
+from .web_fetch_tool_20260309_param import WebFetchTool20260309Param as WebFetchTool20260309Param
 from .web_search_result_block_param import WebSearchResultBlockParam as WebSearchResultBlockParam
 from .thinking_config_adaptive_param import ThinkingConfigAdaptiveParam as ThinkingConfigAdaptiveParam
 from .thinking_config_disabled_param import ThinkingConfigDisabledParam as ThinkingConfigDisabledParam

src/anthropic/types/beta/__init__.py

@@ -134,6 +134,7 @@
 from .beta_tool_search_tool_result_error import BetaToolSearchToolResultError as BetaToolSearchToolResultError
 from .beta_web_fetch_tool_20250910_param import BetaWebFetchTool20250910Param as BetaWebFetchTool20250910Param
 from .beta_web_fetch_tool_20260209_param import BetaWebFetchTool20260209Param as BetaWebFetchTool20260209Param
+from .beta_web_fetch_tool_20260309_param import BetaWebFetchTool20260309Param as BetaWebFetchTool20260309Param
 from .beta_web_search_result_block_param import BetaWebSearchResultBlockParam as BetaWebSearchResultBlockParam
 from .beta_compaction_content_block_delta import BetaCompactionContentBlockDelta as BetaCompactionContentBlockDelta
 from .beta_thinking_config_adaptive_param import BetaThinkingConfigAdaptiveParam as BetaThinkingConfigAdaptiveParam

src/anthropic/types/beta/beta_iterations_usage.py

@@ -1,13 +1,16 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 from typing import List, Union
-from typing_extensions import TypeAlias
+from typing_extensions import Annotated, TypeAlias
 
+from ..._utils import PropertyInfo
 from .beta_message_iteration_usage import BetaMessageIterationUsage
 from .beta_compaction_iteration_usage import BetaCompactionIterationUsage
 
 __all__ = ["BetaIterationsUsage", "BetaIterationsUsageItem"]
 
-BetaIterationsUsageItem: TypeAlias = Union[BetaMessageIterationUsage, BetaCompactionIterationUsage]
+BetaIterationsUsageItem: TypeAlias = Annotated[
+    Union[BetaMessageIterationUsage, BetaCompactionIterationUsage], PropertyInfo(discriminator="type")
+]
 
 BetaIterationsUsage: TypeAlias = List[BetaIterationsUsageItem]