LangChain Release notes and new features

langchain-core==1.7.0

langchain-core 1.7.0 introduces tool-call-delta streaming for tool-call arguments, replacing block-delta snapshots.

LangSmith SDK 0.14.9

- fix(py): stop sandbox run() from waiting 100ms for the server's TCP close feat: send OTLP traces to an Agent environment Fix Python comparative evaluator scores when randomizing concurrent runs chore(deps): bump multidict from 6.7.1 to 6.9.1 in /python feat(py): use TypedDict for AgentAddress instead of dataclass for simpler ser/de release(py): 0.14.9

LangSmith SDK 0.14.8

- fix(py): send session_id on RunTree.patch fix: keep punctuation out of freeze guard links chore(deps): bump source-map-js from 1.2.1 to 1.2.2 in /js fix(py): make the /runs/multipart 404 fallback to /runs/batch reachable feat(sandbox): accept any JOSE asymmetric algorithm chosen by the JWKS key (python) feat(sandbox): customer-managed KMS keys for S3...

LangSmith SDK

- release(js): 0.10.9 ci: freeze js/ now that the JS SDK moved ci: point frozen-folder PRs to the right repo fix(wrappers): don't require completions resource in wrap_anthropic release(py): 0.14.6

• LangSmith SDK 0.14.6
• LangSmith SDK 0.14.7

LangSmith SDK 0.14.5

- release(js): 0.10.8 chore(deps): bump the actions-minor-and-patch group with 3 updates chore(deps-dev): bump types-psutil from 7.2.2.20260827 to 7.2.2.20260906 in /python chore(deps): bump the actions-major group with 2 updates chore(deps): bump the py-minor-and-patch group in /python with 8 updates fix(tests): prevent background uploads from restoring...

LangSmith SDK 0.14.4

- release(js): 0.10.7 ci: request Open SWE investigation of nightly SDK failures refactor: take addresses as strings (Python and JS) fix(py,js): correctly resolve the full OTLP traces endpoint release(py): 0.14.4

LangSmith SDK 0.14.3

- feat(js): add address() handle for agent addressing chore(js): patch vulnerable development dependencies fix(sandbox): retry transient WebSocket failures before command start chore(deps): bump urllib3 from 2.7.0 to 2.8.0 in /python chore(deps): bump pyjwt from 2.13.0 to 2.15.0 in /python chore(deps): bump undici from 7.29.0 to 7.29.1 in...

LangSmith SDK 0.14.2

- fix(js): missing OTel exports for tool name, call_id and definitions chore: increase Python and JS dependency delay to seven days feat(python): add ls.address handle for agent addressing fix(py): preserve response on wrapped HTTP errors fix(js): stub OpenAI transport in completions test fix(py,js): only the primary write replica keeps the original run ids...

LangSmith SDK 0.14.1

- release(js): 0.10.5 ci: mirror merges to the staging repos ci: drop the push-based mirror workflow, staging pulls instead test(py): select s3_urls so list_runs and list_threads return attachments fix(py): fix missing OTel exports for tool_call_id and tool_definitions fix(py): trace ClaudeSDKClient.receive_messages() feat(sandbox): verify service URL user...

LangSmith SDK 0.14.0

- fix(deps): patch soupsieve ReDoS vulnerabilities by John Kennedy (@jkennedyvz) in #3560 feat(sandbox): grant sandboxes delegated LangSmith access on create by Ramon Nogueira (@ramon-langchain) in #3563 feat(sandbox): LangSmith-login service URLs, and service URLs for JS by Ramon Nogueira (@ramon-langchain) in #3564 fix(py): correct broken migration-guide...

LangSmith SDK 0.13.0

- feat(evaluate): add disable_evaluator_tracing toggle to evaluate() and aevaluate() by Sineha Manivannan (@sineha-mani) in #3547 ci(openwiki): open the update PR with gh instead of a third-party action by Thibaut Lehmann (@thibautlehmann) in #3545 refactor(sandbox): deprecate no_proxy in proxy config helpers by Ramon Nogueira (@ramon-langchain) in #3512...

LangSmith SDK 0.12.6

- release(js): 0.10.4 by Emil F (@emil-lc) in #3542 docs: add OpenWiki, with a weekly refresh workflow by Thibaut Lehmann (@thibautlehmann) in #3541 fix(livekit): preserve system instructions with history by Caroline di Vittorio (@carolinedivittorio) in #3544 release(py): 0.12.6 by Caroline di Vittorio (@carolinedivittorio) in #3546 v0.12.5...v0.12.6

LangSmith SDK 0.12.5

- fix: preserve sandbox API error IDs by Mukil Loganathan (@langchain-infra) in #3515 fix(js): avoid stored reasoning in OpenAI integration tests by Emil F (@emil-lc) in #3519 fix(js): update vulnerable test dependencies by Mike Merrill (@linted) in #3525 chore(deps): bump js-yaml from 3.15.1 to 4.3.1 in /js/internal/environment_tests/test-exports-metro in...

LangSmith SDK

- release(js): 0.10.2 by Mukil Loganathan (@langchain-infra) in #3495 test(py): benchmark compressed trace ingestion by Quentin Brosse (@QuentinBrosse) in #3497 fix(py): make the multipart body replayable across both retry layers by Thibaut Lehmann (@thibautlehmann) in #3483 perf: avoid ThreadPoolExecutor churn in hybrid tracing [closes LSDK-213] by Open...

• LangSmith SDK 0.12.3
• LangSmith SDK 0.12.4

LangSmith SDK 0.12.2

- release(js): 0.10.1 by Quentin Brosse (@QuentinBrosse) in #3477 chore(deps): bump the actions-minor-and-patch group with 4 updates by Dependabot (@dependabot) [bot] in #3465 chore(deps-dev): bump types-psutil from 7.2.2.20260518 to 7.2.2.20260827 in /python by Dependabot (@dependabot) [bot] in #3471 chore(deps): bump the py-major group in /python with 4...

LangSmith SDK

- ci: enable CodSpeed flame graphs and pin the benchmarks to one CPU by Emil F (@emil-lc) in #3449 fix(py,js)!: make trace sampling deterministic by Emil F (@emil-lc) in #3183 fix(py): suppress import-untyped on the optional langsmith_pyo3 import by Quentin Brosse (@QuentinBrosse) in #3462 chore(py)!: swtich to httpx2 dependency while keeping httpx as a...

• LangSmith SDK 0.12.0
• LangSmith SDK 0.12.1

LangSmith SDK 0.11.2

- fix: exclude password and email env vars from run metadata by Quentin Brosse (@QuentinBrosse) in #3417 feat(js): Avoid redundantly sending inputs up in patch by Jacob Lee (@jacoblee93) in #3425 release(js): 0.9.0 by Jacob Lee (@jacoblee93) in #3426 test(py): continuous benchmarking with CodSpeed by Emil F (@emil-lc) in #3420 fix: point migration guide...