> ## Documentation Index > Fetch the complete documentation index at: https://docs.getbifrost.ai/llms.txt > Use this file to discover all available pages before exploring further. # v1.3.19 > Enterprise v1.3.19 changelog - 2026-04-18 ## Changelog This release pulls in the OSS v1.4.23 wave: Claude Opus 4.7 support, Anthropic structured outputs, MCP tool annotations, and a large batch of provider-streaming and reliability fixes. The build toolchain reverts to Go 1.26.1. ## ✨ Features * **Claude Opus 4.7 Support** - Full compatibility with Anthropic's Claude Opus 4.7, including adaptive thinking, the task-budgets beta header, `display` parameter handling, and `xhigh` effort mapping * **Anthropic Structured Outputs** - `response_format` and structured output support across chat completions and the Responses API, covering JSON-schema and JSON-object formats with order-preserving merge of additional model request fields * **MCP Tool Annotations** - Preserve MCP tool annotations (`title`, `readOnly`, `destructive`, `idempotent`, `openWorld`) in bidirectional MCP ↔ Bifrost chat tool conversion so agents can reason about tool behavior * **Anthropic Server Tools** - Anthropic chat schema and Responses converters now surface server-side tools (web search, code execution, computer use containers) end-to-end ## 🐞 Fixed * **Provider Queue Shutdown Panic** - Eliminated `send on closed channel` panics during provider queue shutdown; stale producers transparently re-route to new queues during `UpdateProvider`, with rollback on failed updates * **OpenAI Responses Tool Output** - Flattened array-form `tool_result` output into a newline-joined string for the Responses API so strict upstreams (Ollama Cloud, typed openai-go models) no longer reject it with HTTP 400; non-text blocks preserved * **vLLM Token Usage** - Treats `delta.content=""` the same as `nil` in streaming so the synthesis chunk retains its `finish_reason`, restoring token usage attribution * **Bedrock Streaming & Tools** - Emits `message_stop` for Anthropic invoke stream, case-insensitive `anthropic-beta` header merging, and preserves image blocks in tool results when converting Anthropic Messages to Bedrock Converse * **Gemini Tool Outputs & Thinking Level** - Handles content-block tool outputs for `function_call_output` and preserves `thinkingLevel` parameters across round-trip conversions with corrected finish-reason mapping * **Responses Streaming Errors** - Mid-stream errors in the Responses API are now captured so transport clients see failures instead of silent termination * **Anthropic WebSearch & Fallbacks** - Removed the Claude Code user-agent restriction so WebSearch tool arguments flow for all clients; fallback fields are dropped from outgoing Anthropic requests to avoid schema validation errors * **Async Context Propagation** - Preserve context values in async requests so downstream handlers retain request-scoped data * **Custom Providers** - Allow custom providers without a list-models endpoint to accept any model rather than restricting on virtual key registration * **OTEL Plugin** - `insecure` defaults to `true` in config.json and emitted OTEL metrics now include fallbacks * **Config Schema Validator** - Corrected JSON-path lookups for concurrency and SCIM blocks, and reformatted `transports/config.schema.json` for readability * **Helm Chart** - Validation fixes, prerelease tag removed, and `mcpClientConfig` templating corrected * **CI Egress Hardening** - `step-security/harden-runner` switched from `audit` to `block` across all GitHub Actions workflows with explicit `allowed-endpoints` per job ## 🛠️ Build * **Go 1.26.1** - Build toolchain reverted from Go 1.26.2 back to Go 1.26.1 ## 📀 Base OSS version `transports/v1.4.23` ## 🔌 If you are compiling plugin against this release - use following deps ``` module github.com/maximhq/bifrost-enterprise go 1.26.1 require ( cloud.google.com/go/bigquery v1.73.1 github.com/DataDog/datadog-go/v5 v5.6.0 github.com/DataDog/dd-trace-go/v2 v2.4.0 github.com/aws/aws-sdk-go-v2/config v1.32.11 github.com/aws/aws-sdk-go-v2/credentials v1.19.11 github.com/aws/aws-sdk-go-v2/service/bedrockruntime v1.50.4 github.com/bytedance/sonic v1.15.0 github.com/coreos/go-oidc/v3 v3.12.0 github.com/fasthttp/router v1.5.4 github.com/golang-jwt/jwt/v5 v5.3.0 github.com/google/cel-go v0.26.1 github.com/google/uuid v1.6.0 github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674 github.com/grandcat/zeroconf v1.0.0 github.com/hashicorp/consul/api v1.22.0 github.com/hashicorp/memberlist v0.5.4 github.com/maximhq/bifrost/core v1.4.22 github.com/maximhq/bifrost/framework v1.2.39 github.com/maximhq/bifrost/plugins/governance v1.4.39 github.com/maximhq/bifrost/plugins/logging v1.4.39 github.com/maximhq/bifrost/transports v1.4.23 github.com/nakabonne/tstorage v0.3.6 github.com/stretchr/testify v1.11.1 github.com/testcontainers/testcontainers-go v0.40.0 github.com/tetratelabs/wazero v1.11.0 github.com/valyala/fasthttp v1.68.0 go.etcd.io/etcd/client/v3 v3.6.6 golang.org/x/crypto v0.49.0 golang.org/x/oauth2 v0.36.0 google.golang.org/api v0.265.0 google.golang.org/protobuf v1.36.11 gorm.io/driver/sqlite v1.6.0 gorm.io/gorm v1.31.1 k8s.io/api v0.34.1 k8s.io/apimachinery v0.34.1 k8s.io/client-go v0.34.1 ) ```