Bifrost HTTP v1.6.9

Bifrost HTTP Transport Release v1.6.9

✨ Features

• Bedrock HTTP/2 PING Keepalives — Opt-in HTTP/2 PING keepalives on the Bedrock provider via the new http2_ping_interval_in_seconds config key (0 = off), keeping quiet streams alive through intermediaries that sever idle connections (thanks @jeremym-tanium!)
• Expanded OTEL Metric Attributes — Metrics now carry a service instance id plus team, customer, and business-unit ids and names, so exported series can be sliced by tenant without post-processing
• Adaptive Thinking on Raw Passthrough — Adaptive-only Anthropic models (Opus 4.7+, Opus 4.8, Opus 5, Sonnet 5, Fable 5, Mythos 5) now get legacy thinking.type: "enabled" rewritten to the adaptive form on the raw passthrough body as well as the typed request path

🐞 Fixed

• SSE Heartbeat Mid-Line Corruption — The stream reader now tracks line boundaries under a mutex and refuses to emit a heartbeat mid-line, fixing corrupted data: payloads on raw passthrough streams where a heartbeat could split a JSON line
• SSE Heartbeat Frame Compatibility — Dropped the trailing blank line from the heartbeat comment frame so non-conforming SSE decoders (e.g. openai-go ssestream before v3.43.0) no longer dispatch an empty event and abort mid-stream with "unexpected end of JSON input"
• Lost Log Rows on Shared Trace IDs — Concurrent HTTP requests that inherit the same W3C trace id no longer overwrite each other's pending log entry; the join now uses the per-request internal trace id (thanks @AdityaPainuli!)
• Budget Counters Reset on Force-Sync — config.json force-sync no longer overwrites live current_usage, last_reset, and the token/request rate-limit counters with the values from the file
• Transcription Filename Dropped — The client's multipart filename is now carried through transcription ingress, so non-WAV containers are no longer relabelled audio.mp3 and rejected upstream (thanks @AdityaPainuli!)
• Anthropic Mid-Conversation System Messages — A role:"system" turn that cannot be forwarded natively is now inlined as a user turn instead of being dropped, the placement check enforces both of Anthropic's clauses, and Bedrock's system-reminder converter keeps its cache_control marker
• Bedrock Streaming Correctness — ConverseStream reports stopReason: tool_use for tool-use turns instead of end_turn (thanks @axelray-dev!); message_start carries an all-zero usage object when figures are unknown so @ai-sdk/anthropic 4.0.6-4.0.32 accepts the frame; and encrypted reasoning is preserved as a replay signature when translating Responses history (thanks @zachgersh!)
• Encrypted Reasoning Fail-Soft — An upstream 400 caused by unverifiable replayed encrypted_content now strips the reasoning content and retries once instead of failing the request, which matters when a key pool rotates or a request falls back to another provider
• Server-Side Tool Search — tool_search_tool_* types are normalized on the Responses path, and include_server_side_tool_invocations now reaches the Gemini declaration-drop gate (thanks @AdityaPainuli!)
• DeepSeek Thinking on Multi-Turn — Thinking is no longer silently disabled for ordinary multi-turn conversations through the OpenAI-compatible surface; the shim is non-mutating and inbound reasoning aliases are normalized
• Vertex and Gemini Response Fidelity — generateContent keeps candidates[0].safetyRatings and avgLogprobs, and the Vertex cached-content methods honour API-key or context-header auth instead of overwriting Authorization with an OAuth token (thanks @TransactCharlie!)
• Custom Provider Base Resolution — OpenAI models served through a custom provider now resolve to their built-in base provider before deciding reasoning item-id embedding
• MCP Tool Errors Replayed as Success — Failed MCP tool executions are now marked as errors instead of being replayed to the model as successful results, covering agent-loop failures, the MCP protocol's own isError flag, and CodeMode lookup/sandbox failures (thanks @AidanAllchin!)
• Tool-Result Document Blocks — document blocks in tool results survive the Anthropic to Responses conversion with a synthesized filename, and FileURL/FileType propagate through all three chat/responses conversion paths
• Stream Termination Edge Cases — A nil delta paired with a non-nil finish reason no longer aborts the stream, and GPT-5-series detection tolerates prefixed model names when resolving reasoning-effort support

🗄️ Database Migrations

• No new database migrations in this release.

🐙 Closed GitHub Issues

• #5206 — Bedrock ConverseStream egress reports stopReason=end_turn for tool-use turns (should be tool_use)
• #5211 — Bedrock streaming can drop with "unexpected EOF" when an intermediary idle timeout severs a quiet stream
• #5256 — Concurrent HTTP requests sharing a W3C trace ID lose LLM log rows
• #5279 — OpenAI /v1/responses to Anthropic drops the tool_search_tool_regex type, so server-side tool_search never runs
• #5670 — Transcription drops the client's multipart filename, so non-WAV containers are relabelled audio.mp3 and rejected
• #5679 — Anthropic Messages does not propagate Gemini mixed server/client tool opt-in
• #5843 — generateContent (Gemini format) drops candidates[0].safetyRatings and avgLogprobs on Vertex AI responses
• #5874 — SSE heartbeat frame aborts streams for openai-go ssestream consumers (< v3.43.0) with "unexpected end of JSON input"
• #5885 — v1.6.8 omits message_start.message.usage on Bedrock-backed providers, breaking @ai-sdk/anthropic streaming
• #5887 — DeepSeek thinking silently lost on ALL multi-turn requests via OpenAI-compat inbound (v1.6.7; regression from v1.6.3)
• #5890 — chat completions surface drops tool_result is_error, so failed tool calls replay to the model as successful
• #5902 — service_tier silently dropped for gpt-5.4 family, priority/fast requests downgrade to default
• #5905 — v1.6.8 raw passthrough heartbeat can split SSE data lines and corrupt JSON
• #5925 — config.json force-sync overwrites budget current_usage and last_reset on startup

🔧 Maintenance

• Dependency Upgrades — Bumped core to v1.7.7 and framework to v1.5.7; all plugins bumped to pick up the cascade (compat v0.1.33, governance v1.6.11, jsonparser v1.5.34, logging v1.6.7, maxim v1.6.34, mocker v1.5.34, modelcatalogresolver v1.0.15, otel v1.4.6, prompts v1.0.34, semanticcache v1.5.34, telemetry v1.5.34)

Installation

Docker

docker run -p 8080:8080 maximhq/bifrost:v1.6.9

Binary Download

npx @maximhq/bifrost --transport-version v1.6.9

Docker Images

• maximhq/bifrost:v1.6.9 - This specific version
• maximhq/bifrost:latest - Latest version (updated with this release)

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This release was automatically created with dependencies: core v1.7.7, framework v1.5.7. All plugins have been validated and updated.