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fix(langchain): preserve open MCP object arguments (#40414) Some MCP servers expose a small set of gateway tools—such as list, describe, and call—instead of one tool per operation. Their call tool accepts a free-form object, but provider conversion can accidentally turn that argument into an object that accepts no fields. This change marks those direct free-form object arguments explicitly with `additionalProperties: true`, so models can send operation-specific keys through the gateway. It preserves constraints supplied by the MCP server and does not mutate the original schema. The normalization is intentionally narrow: it only examines direct tool properties rather than recursively walking every JSON Schema keyword. Six focused MCP schema tests pass; Ruff formatting/lint and mypy pass. No new dependencies or public API changes. Made by [Open SWE](https://openswe.vercel.app/agents/3165441c-7638-5635-ae33-7d39299acb38) · openai:gpt-5.6-sol (high) --------- Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com> Co-authored-by: sydney-runkle <sydney-runkle@users.noreply.github.com>

master

2 hours ago

fix(langchain): detect IPv6 addresses in `PIIMiddleware` ip type `detect_ip` only compiled an IPv4 pattern, so IPv6 addresses (including compressed forms like `fe80::1` and `::1`) passed through undetected. With `strategy="redact"` the address reached the model unchanged, and with `strategy="block"` no error was raised. Add an IPv6 pattern alongside the IPv4 pattern; both are validated with `ipaddress.ip_address`, which accepts both families. Closes #39842

sushant-me:sushant-me/langchain/fix-pii-ipv6-detection

11 hours ago

cc/hitl-tool-edits-toolcallrequest

12 hours ago

cc/hitl-tool-edits-toolcallrequest

12 hours ago

nit: update notice

cc/hitl-tool-edits-toolcallrequest

13 hours ago

refactor(langchain): simplify MCP schema normalization Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

jkennedyvz/langchain/mcp-open-object-schema

4 days ago

fix(langchain): preserve open MCP object arguments Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

jkennedyvz/langchain/mcp-open-object-schema

4 days ago

cc/hitl-tool-edits

5 days ago

Latest Branches

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fix(langchain): detect IPv6 addresses in PIIMiddleware ip type#40468

11 hours ago

e0fbfaf

sushant-me:sushant-me/langchain/fix-pii-ipv6-detection

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fix(langchain): preserve model-generated tool calls in HITL tool call edits and add notice to ToolMessage#40463

12 hours ago

fd9c9d6

cc/hitl-tool-edits-toolcallrequest

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fix(langchain): preserve open MCP object arguments#40414

4 days ago

24c9881

jkennedyvz/langchain/mcp-open-object-schema

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