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fix(langchain): keep MCP `structuredContent` on tool error results An MCP tool result with `isError=True` raised before its `structuredContent` was read, so the error `ToolMessage` always had `artifact=None`. Build the artifact first, carry it on `_MCPToolExecutionError`, and have the error handler return an error `ToolMessage` with the artifact when the call came from a tool call. Fixes #40471 Co-authored-by: hylin <204567536+linhongyu510@users.noreply.github.com> Co-authored-by: Marian Glen Louis <55579949+glenlouis8@users.noreply.github.com>

hunter/mcp-error-structured-content

2 minutes ago

release(core): 1.7.3 (#41564) Require `certifi>=2026.10.19` to exclude certificate bundles affected by compromised emSign CA keys. It is already installed through `httpx`, but older, vulnerable versions are still allowed. --- Release `langchain-core` 1.7.3 with a minimum `certifi` version that excludes a [critical certificate-security vulnerability](https://github.com/advisories/GHSA-6q48-6c7w-9gw2). - `certifi` provides trusted certificates for HTTPS connections. - Require `certifi>=2026.10.19` directly so users cannot retain an affected version when installing this release. A development lockfile or uv override would only protect this repository, not downstream installations. - Remove this temporary direct requirement once our minimum supported `httpx` version enforces the same safe minimum. - Bump the package metadata, runtime version, and lockfile to `1.7.3`. ## References - [Slack thread](https://langchain.slack.com/archives/C0C5950ARJT/p1793305484489639) Made by [Open SWE](https://github.com/langchain-ai/open-swe) · [view thread](https://openswe.langchain.dev/agents/43986e15-cd6f-57b9-822e-ab581fc42d0f) · openai:gpt-6.1-sol (medium) --------- Co-authored-by: Mason Daugherty <mdrxy@users.noreply.github.com> Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com> Co-authored-by: ccurme <ccurme@users.noreply.github.com>

master

4 minutes ago

docs(core): clarify when to remove certifi requirement Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

mdrxy/core/certifi-safe-minimum

11 minutes ago

release(core): 1.7.3 Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

mdrxy/core/certifi-safe-minimum

16 minutes ago

release(core): 1.7.2 (#41562)

master

2 hours ago

increment version

cc/release-core

2 hours ago

feat(core): add `add_notification_metadata` and `get_notification_metadata` (#41540)

master

4 hours ago

refactor(core): narrow `add_notification_metadata` to `HumanMessage`

bengret/core/notification-message-factory

4 hours ago

Latest Branches

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fix(langchain): keep MCP `structuredContent` on tool error results#41566

5 minutes ago

2e33322

hunter/mcp-error-structured-content

0%

release(core): 1.7.3#41564

14 minutes ago

c3748f6

mdrxy/core/certifi-safe-minimum

0%

release(core): 1.7.2#41562

2 hours ago

8a73efd

cc/release-core

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