release(deepagents): 0.5.3

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0.5.3 (2026-04-14)

Features

• sdk,cli: add openrouter SDK attribution (#2205) (2798e51)
• sdk,cli: add package version metadata to traces (#2129) (e4a44b4)
• sdk: BASE_AGENT_PROMPT tweaks (#2541) (812eef1)
• sdk: add artifacts_root to CompositeBackend and middleware (#2490) (753ee56)
• sdk: add async subagent middleware for remote LangGraph servers (#1758) (0c5d501)
• sdk: add permissions system for filesystem access control (#2633) (41dc759)
• sdk: add static structured output to subagent response (#2437) (6e57731)
• sdk: add system prompt snapshot test with sync and async subagents (#2072) (98874f5)
• sdk: add tau2 airline eval harness (#1987) (610b19f)
• sdk: add tau2 LICENSE (#2025) (650cedb)
• sdk: add timestamp tracking to AsyncSubAgentJob (#2071) (93aa3cf)
• sdk: deprecate model=None in create_deep_agent (#2677) (149df41)
• sdk: evict large HumanMessages (#2183) (4f72c34)
• sdk: namespace improvements for deepagents (#2386) (66c57e1)
• sdk: port LangSmithSandbox from CLI to SDK (#1983) (dfff6e7)
• sdk: rename backend methods (#1907) (7665066)
• sdk: scope permissions to routes for composite backends with sandbox default (#2659) (6dd6122)
• sdk: update backend return types for ls, glob, grep (#1870) (23cf264)
• sdk: update FileData and backend.read return type to support multimodal data (#1869) (6fb4ede)

Bug Fixes

• plumb through generics for create_deep_agent (#2383) (6c28e22)
• remove legacy subagents API (#2443) (56bbfd3)
• sdk,cli: align error messages and clean up recent refactors (#2171) (e2db737)
• sdk: last_updated_at field doesn't account for task status changes (#2370) (8e1a2d6)
• sdk: add new line after HEREDOC for edit inline sandbox (#2340) (beb4dbb)
• sdk: bump recursion limit to 10_000 in deepagents and set agent name (#2194) (7dbc251)
• sdk: catch UnicodeDecodeError in FilesystemBackend.read (#2319) (9783fe4)
• sdk: catch PermissionError in FilesystemBackend ripgrep (#2571) (3d5d673)
• sdk: fix offloading for state backend (#2266) (92f5507)
• sdk: fix TypeError in async sub-agents (#2376) (8be4a2e)
• sdk: implement upload_files for StateBackend (#2661) (5798345)
• sdk: improvements in default sandbox.write and sandbox.read implementations (#2321) (4a37a46)
• sdk: inherit parent interrupt_on for subagents (#2334) (acad9bb)
• sdk: make created_at and modified_at NotRequired fields on FileData (#2248) (9862b5a)
• sdk: match example_agent_descriptions closing tag in task tool prompt (#2462) (c36a41c)
• sdk: normalize CRLF line endings in FilesystemBackend.edit() (#2256) (69bd21e)
• sdk: overwrite write on LangSmithSandbox (#2097) (c492a76)
• sdk: raise ValueError for permission paths without leading slash and path traversal (#2665) (723d27d)
• sdk: restore deprecated protocol return types (#2342) (845cdf5)
• sdk: route subagent model resolution to resolve_model (#2208) (6720e4c)
• sdk: simplify memory agent bench evals (#1873) (a5d577d)
• sdk: update middleware order (#2070) (def526b)
• sdk: update recursion limit (#2273) (fd91a30)
• sdk: updates for multimodal (#2514) (a2edf3e)
• sdk: use file transfer instead of command strings for sandbox write/edit (#2117) (6c2d559), closes #1402
• sdk: use Sequence instead of list for subagents parameter (#1905) (b6f015e)

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Everything above this line will be the GitHub release body.

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Note

A New Contributors section is appended to the GitHub release notes automatically at publish time (see Release Pipeline, step 2).