release: 0.129.0

[stainless-app]

Automated Release PR

0.129.0 (2026-02-06)

Full Changelog: v0.128.0...v0.129.0

Features

• api: Add naics_code to account holder requests/responses (432e7ee)
• mcp: add initial server instructions (12f5335)
• mcp: allow specifying environment via remote server (f2bbc59)

Bug Fixes

• client: avoid memory leak with abort signals (ef3a98b)
• client: avoid removing abort listener too early (eb0e7f7)
• mcp: do not fallback on baseUrl if environment env variable is set (07d71d3)

Chores

• client: do not parse responses with empty content-length (f8fdb77)
• client: restructure abort controller binding (45461df)
• configure new SDK language (a09926d)
• formatting (1eb7005)
• internal: add health check to MCP server when running in HTTP mode (7e123b2)
• internal: configure MCP Server hosting (3feac24)
• internal: fix pagination internals not accepting option promises (e258c68)
• internal: refactor flag parsing for MCP servers and add debug flag (5ddc39b)
• internal: support oauth authorization code flow for MCP servers (cc5b02e)

Documentation

• Fix documentation of tokenization channel and tokenization source for tokenization rules (35696df)

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