maximhq/bifrost transports/v2.2.4

Bifrost HTTP v2.2.4

on GitHub

Bifrost HTTP Transport Release v2.2.4

✨ Features

• Anthropic Between-Tools Thinking - reasoning.type: "between_tools" on chat and Responses requests, and thinking: {"type": "between_tools"} on the Anthropic drop-in route, are forwarded to Anthropic, Bedrock and Vertex with the caller's effort passed independently. Models without it get disabled or no thinking field, so a fallback to an older model never fails. The datasheet supports_between_tools_thinking field can override this (#7665)
• Tool Search for GPT-5.4 and Later - defer_loading on function and MCP tools now reaches OpenAI, Azure, Bedrock and Bedrock Mantle for gpt-5.4, gpt-5.5, gpt-5.6 and gpt-6 models, so the model can search deferred tools instead of loading every tool eagerly. Other OpenAI-compatible backends still have it stripped. The datasheet supports_tool_search field can override this (#7534)
• Skipped Routing Fallbacks Are Logged - A rule fallback that names no known provider is now reported in the request's routing log with the rule name and the configured entry, instead of being skipped silently (#7546)

🐞 Fixed

• Routing Fallbacks Dropped After Restart - Legacy provider/model fallback strings are re-parsed at route time, so a custom provider registered after routing rules were decoded at boot is no longer skipped while the API still listed the fallback. Object-form fallbacks naming an unregistered or blank provider are now rejected on create and update (#7543, #7544, #7545)
• Bedrock Thinking Tokens - Requests on /bedrock/model/{id}/invoke and its streaming sibling with extended thinking on are served through InvokeModel, and usage.output_tokens_details.thinking_tokens is reported in unary responses and in the message_start and message_delta events (#7691)
• Encrypted Reasoning Retry After a Provider Switch - The strip-and-retry for replayed reasoning now fires on any 400 that names a reasoning token, instead of matching each provider's wording, so a mid-conversation switch such as bedrock to bedrock_mantle heals instead of returning the 400 to the client. Gemini and Vertex thought signatures carried inside call ids are stripped as well (#7680)
• OpenRouter Error Messages - The upstream provider's own error message is lifted out of error.metadata.raw, replacing the generic "Provider returned error" (#7680)
• Truncated Turns on Anthropic and Gemini - Responses turns cut off by max_output_tokens or a refusal now report status incomplete with incomplete_details, streams end with response.incomplete, and the Bedrock, Gemini and Cursor drop-in routes translate that into their own stop reason. A Gemini stream that ends without a finish reason no longer reads as a clean stop (#7677)
• File Data on OpenAI-Compatible Providers - file_data sent as bare base64 with a file_type is folded into a data: URL, which OpenAI and Databricks require, instead of being rejected with "Invalid base64 data URL format" (#7682)
• Gemini Histories Replayed to OpenAI - A function_call input item whose id does not start with fc no longer fails OpenAI validation natively or through a fallback. The id is dropped and call_id is kept so outputs still pair (#7676)
• Gemini Thought Signatures on Images and Files - A thought signature on an inline image or file part stays on that content block and round-trips back to Gemini, instead of being dropped or emitted as a separate reasoning item (#7692)
• Governance Resets During Startup - Startup resets and the periodic reset worker now run only after governance state is fully hydrated, and team-owned budgets and rate limits keep the team's calendar alignment after a restart, so calendar-aligned limits are no longer reset on a creation-anchored boundary (#7615, #7637)
• Model Histogram Unnamed Series - Rows without a model, such as list_models, file and batch operations, are excluded from the model histogram (#7632)
• Ungoverned Virtual Key Creation - A user without an access profile no longer sees locked governance fields when creating a virtual key. The form locks only when a profile actually governs, and a failed policy lookup shows a warning with a retry instead of locking (#7413)

🗄️ Database Migrations

• No new database migrations in this release.

🐙 Closed GitHub Issues

• #7538 - Routing-rule fallbacks are dropped after restart in v2.2.3 (still listed by the API)
• #7649 - Bedrock provider drops extended-thinking token count (output_tokens_details.thinking_tokens) that AWS returns

Installation

Docker

docker run -p 8080:8080 maximhq/bifrost:v2.2.4

Binary Download

npx @maximhq/bifrost --transport-version v2.2.4

Docker Images

• maximhq/bifrost:v2.2.4 - This specific version
• maximhq/bifrost:latest - Latest version (updated with this release)

This release was automatically created with dependencies: core v1.11.0, framework v1.7.5. All plugins have been validated and updated.