python/v1.55.0

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python/v1.55.0

Auto-drafted from commits in python/v1.54.0..python/v1.55.0, grouped by conventional-commit type. Edit on the release page after publish if you want a polished writeup; the canonical release notes live on the website.

🚀 Features

• feat: export context manager types as experimental (feat: export context manager types as experimental #4231) (ec6eb54)
• feat: accept cache_config on Ollama, Writer, and SageMaker (feat: accept cache_config on Ollama, Writer, and SageMaker #4232) (42aedfc)
• feat(context-py): port stash integration (feat(context-py): port stash integration #4187) (a642b41)
• feat(mcp): add prefix_with_server_name and continue_on_error defaults to load_servers (feat(mcp): add prefix_with_server_name and continue_on_error defaults to load_servers #4177) (def3be9)
• feat(context-py): port offloading stratgies (feat(context-py): port offloading stratgies #4146) (e3f3ee4)
• feat(bidi): add AudioCapable and typed model config (feat(bidi): add AudioCapable and typed model config #4144) (d835251)
• feat(mcp-py): relax mcp version to <2.2 (feat(mcp-py): relax mcp version to <2.2 #4151) (24e556b)
• feat(context-manager): add session support for L1 (feat(context-manager): add session support for L1 #4118) (3f2ee2f)
• feat(mcp/py): support SEP-2663 tasks (feat(mcp/py): support SEP-2663 tasks #4125) (83982c2)
• feat(python): add internal in-process task engine / manager (feat(python): add internal in-process task engine / manager #4115) (726478d)
• feat!: require Node.js 22+, drop Node 20 support (feat!: require Node.js 22+, drop Node 20 support #4145) (24bc5c3)
• feat(py): add web_fetch vended tool (feat(py): add web_fetch vended tool #4001) (8cd82e6)
• feat(bidi): implement LocalAgent (feat(bidi): implement LocalAgent #4108) (d1da8a0)
• feat: add cache config to llama.cpp (feat: add cache config to llama.cpp #4127) (9be952f)
• feat: support caching for vercel provider (feat: support caching for vercel provider #4055) (a02c1db)
• feat(mcp-py): extend MRTR to prompts and resources, scope hand-sent cancel to 1.x (feat(mcp-py): extend MRTR to prompts and resources, scope hand-sent cancel to 1.x #4121) (582bb48)
• feat(mcp-py): refresh tools on list-changed notifications for 2.x (feat(mcp-py): refresh tools on list-changed notifications for 2.x #4112) (27a30e0)
• feat(mcp-py): added MRTR input-required support for 2.x (feat(mcp-py): added MRTR input-required support for 2.x #4094) (47b9dad)
• feat(bidi): add reconnect() for openai (feat(bidi): add reconnect() for openai #4104) (48d360d)
• feat(agent): add LocalAgent protocol (feat(agent): add LocalAgent protocol #4091) (577a9d6)
• feat(models): add tools_ttl to CacheConfig and deprecate cache_tools ([FEATURE] Add tools_ttl to Python CacheConfig and deprecate cache_tools #3893) (feat(models): add tools_ttl to CacheConfig and deprecate cache_tools (#3893) #3985) (8e403d7)
• feat(mcp): added call_tool support for 2.x (feat(mcp): added call_tool support for 2.x #4090) (b0ff900)
• feat(context-manager): add L1 stash for durable storage of offloaded content (feat(context-manager): add L1 stash for durable storage of offloaded content #3924) (1f059ff)
• feat(bidi): add reconnect() for gemini google live (feat(bidi): add reconnect() for gemini google live #4078) (c1a8884)
• feat(ts): porting classifier routing strategy from python (feat(ts): porting classifier routing strategy from python #3987) (f2f15f4)
• feat(py): support multiple continuation inputs (feat(py): support multiple continuation inputs #3953) (4705f0c)
• feat(ts): add backgroundTasks to Agent (feat(ts): add backgroundTasks to Agent #4026) (c1d5e4e)
• feat(mcp): added server/discover for SEP-2575 (feat(mcp): added server/discover for SEP-2575 #3821) (00dd3c5)
• feat: mcp v2 compatible changes under a flag (feat: mcp v2 compatible changes under a flag #3708) (534692a)
• feat(storage): add QmdSearchStrategy with BM25 full-text search (feat(storage): add QmdSearchStrategy with BM25 full-text search #3897) (3d15419)
• feat(models): add cache_config to Mistral (feat(models): add cache_config to Mistral #3986) (eabcb13)
• feat(bidi): proactive session reconnect for bidi session (feat(bidi): proactive session reconnect for bidi session #3874) (23d39ac)
• feat(ts): add internal BackgroundTaskManager interface + InProcessTaskManager impl (feat(ts): add internal BackgroundTaskManager interface + InProcessTaskManager impl #3876) (45bcea8)
• feat(bedrock): support API key authentication (feat(bedrock): support API key authentication #3601) (01a5aad)

🐛 Fixes

• fix(file-editor): stop str_replace and insert from expanding tabs on the write path (fix(file-editor): stop str_replace and insert from expanding tabs on the write path #4182) (332a148)
• fix: handle empty input for zero-argument tools without warning (fix: handle empty input for zero-argument tools without warning #4195) (f86a170)
• fix(context-offloader): preserve non-bytes image/document blocks ([BUG] ContextOffloader silently destroys document blocks whose source isn't bytes #4017) (fix(context-offloader): preserve non-bytes image/document blocks (#4017) #4059) (0bce4ed)
• fix(vercel): emit tool results before user text to preserve tool_use/tool_result adjacency (fix(vercel): emit tool results before user text to preserve tool_use/tool_result adjacency #4138) (3b4ca85)
• fix(session): remove orphaned toolResults at any index, not only the first (fix(session): remove orphaned toolResults at any index, not only the first #4154) (ca188fe)
• fix(mcp-py): added httpx2 adapter (fix(mcp-py): added httpx2 adapter #4183) (c956822)
• fix: gate the deprecated cache_tools point on the resolved cache strategy (fix: gate the deprecated cache_tools point on the resolved cache strategy #4186) (55803bc)
• fix(typescript): remove @tobilu/qmd from optional dependencies (fix(typescript): remove @tobilu/qmd from optional dependencies #4178) (6cdd21b)
• fix(bidi): rename reconnect to restart (fix(bidi): rename reconnect to restart #4143) (34d0362)
• fix(openai): report max_tokens when a Responses function call is cut off (fix(openai): report max_tokens when a Responses function call is cut off #4139) (4bddde6)
• fix(mcp-py): resolve the OAuth scope keyword rename on mcp 2.x (fix(mcp-py): resolve the OAuth scope keyword rename on mcp 2.x #4147) (61deac5)
• fix(bidi): internal renames for bidi constants and private class (fix(bidi): internal renames for bidi constants and private class #4140) (10a9b37)
• fix(ts): close the model invoke span when the consumer breaks the stream (fix(ts): close the model invoke span when the consumer breaks the stream #3898) (2c18d8f)
• fix(storage): reject backslashes in storage keys (fix(storage): reject backslashes in storage keys #4126) (d00fed6)
• fix(bedrock): handle missing reasoningText in non-streaming conversion (fix(bedrock): handle missing reasoningText in non-streaming conversion #4124) (26ee1a1)
• fix: include cached tokens in input_tokens (fix: include cached tokens in input_tokens #4080) (33f139b)
• fix(sagemaker): parse each SSE event within a PayloadPart (fix(sagemaker): parse each SSE event within a PayloadPart #4036) (f51718e)
• fix(bidi): bedrock nova sonic reconnect (fix(bidi): bedrock nova sonic reconnect #4082) (7b0f874)
• fix(ts-telemetry): close cycle telemetry when the stream iterator exits early (fix(ts-telemetry): close cycle telemetry when the stream iterator exits early #4054) (d51ad20)
• fix(mcp): pass list pagination as params for the mcp 2.x version (fix(mcp): pass list pagination as params for the mcp 2.x version #3984) (7cec80d)
• fix(python): close agent trace span on BaseException cancellation (fix(python): close agent trace span on BaseException cancellation #4013) (ed05dcf)
• fix(file-editor): stop str_replace and insert from rewriting untouched bytes (fix(file-editor): stop str_replace and insert from rewriting untouched bytes #4014) (e448bea)

♻️ Refactoring

• refactor(bidi): make BidiModel extend Model (refactor(bidi): make BidiModel extend Model #4081) (df837aa)
• refactor(bidi): refine audio processing configuration (refactor(bidi): refine audio processing configuration #3952) (1872856)
• refactor(bidi): rename model providers (refactor(bidi): rename model providers #3956) (3f1e99b)
• refactor(python): port pending tool execution state (refactor(python): port pending tool execution state #3894) (29dfce6)

📚 Documentation

• docs: add Lelu to the integrations catalog (docs: add Lelu to the integrations catalog #4196) (b31169e)
• docs: blog post on hitting 99.95% on ARC-AGI-3 with Strands harness (docs: blog post on hitting 99.95% on ARC-AGI-3 with Strands harness #4048) (e5b6b6d)
• docs: add model routing guide (docs: add model routing guide #4092) (f271cab)
• docs: recommend snapshot session manager (docs: recommend snapshot session manager #4116) (85d3b88)
• docs(changelog): sync strands-agents/harness-sdk typescript/v1.16.0 (docs(changelog): sync strands-agents/harness-sdk typescript/v1.16.0 #4085) (1adf5f1)
• docs: add mem0-strands (memory-store) (docs: add mem0-strands (memory-store) #4003) (5bf5d66)
• docs(site): name the SDK and install packages on agent-retrieved pages (docs(site): name the SDK and install packages on agent-retrieved pages #4044) (9062527)
• docs(blog): add Agents for Humans hackathon challenge post (docs(blog): add Agents for Humans hackathon challenge post #3927) (02bbf0a)
• docs(design): align 0016 with shipped ClassifierStrategy (docs(design): align 0016 with shipped ClassifierStrategy #4046) (717f7e4)
• docs: lead README and llms.txt with when to choose Strands (docs: lead README and llms.txt with when to choose Strands #4045) (3289148)
• docs: blog post on Strands Robots networking and the Model Hardware Standard (docs: blog post on Strands Robots networking and the Model Hardware Standard #4024) (1941a72)
• docs(changelog): sync strands-agents/harness-sdk python/v1.54.0 (docs(changelog): sync strands-agents/harness-sdk python/v1.54.0 #4023) (b506d6a)

✅ Tests

• test(mcp): added mcp 2.x integ tests (test(mcp): added mcp 2.x integ tests #4129) (0b2597a)
• test(bedrock): stabilize the cache-point-after-document integ test (test(bedrock): stabilize the cache-point-after-document integ test #4119) (e13bfcd)

👷 CI

• ci(typescript): add install-size guard to pack test (ci(typescript): add install-size guard to pack test #4179) (e1f35db)
• ci(docs): bump typedoc-plugin-markdown from 4.12.0 to 4.13.0 in /site (ci(docs): bump typedoc-plugin-markdown from 4.12.0 to 4.13.0 in /site #4073) (aba32d9)
• ci(docs): bump p-limit from 7.3.1 to 7.3.2 in /site (ci(docs): bump p-limit from 7.3.1 to 7.3.2 in /site #4163) (103642b)
• ci: move codecov config to repo root so Codecov discovers it again (ci: move codecov config to repo root so Codecov discovers it again #4174) (f4a3191)
• ci: use strands-agents 4-core runner pool (ci: use strands-agents 4-core runner pool #4141) (0918098)
• ci: cancel superseded PR runs to reduce runner concurrency (ci: cancel superseded PR runs to reduce runner concurrency #4134) (022e5a5)
• ci(docs): bump node-html-parser from 9.0.1 to 9.0.2 in /site (ci(docs): bump node-html-parser from 9.0.1 to 9.0.2 in /site #4099) (6d325ef)
• ci(docs): bump markdown-it from 15.0.0 to 15.0.1 in /site (ci(docs): bump markdown-it from 15.0.0 to 15.0.1 in /site #4075) (d8f250d)
• ci(docs): bump @astrojs/starlight from 0.41.7 to 0.41.9 in /site (ci(docs): bump @astrojs/starlight from 0.41.7 to 0.41.9 in /site #4072) (55cd79a)
• ci(docs): bump astro from 7.2.2 to 7.2.6 in /site (ci(docs): bump astro from 7.2.2 to 7.2.6 in /site #4030) (c2d2d4f)
• ci(docs): bump @types/markdown-it from 14.1.2 to 14.2.0 in /site (ci(docs): bump @types/markdown-it from 14.1.2 to 14.2.0 in /site #3908) (7848cd9)
• ci(docs): bump satteri from 0.9.5 to 0.10.5 in /site (ci(docs): bump satteri from 0.9.5 to 0.10.5 in /site #3939) (82f5c6c)

🔧 Chores

• chore(bidi): upgrade pywebrtc audio to 0.2 (chore(bidi): upgrade pywebrtc audio to 0.2 #4149) (2acc974)
• chore(python): deprecate LlamaAPI model provider (chore(python): deprecate LlamaAPI model provider #4011) (36c9e41)

🔖 Other

• feat(bidi) compress event queues to be one event queue for bidi lifecycle events (feat(bidi) compress event queues to be one event queue for bidi lifecycle events #4173) (562ada4)
• design: propose shared agent and model types (design: propose shared agent and model types #3855) (fba4701)

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This discussion was created from the release python/v1.55.0.