> ## 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.
# v1.5.6
> v1.5.6 changelog - 2026-05-29
```bash theme={null}
npx -y @maximhq/bifrost --transport-version v1.5.6
```
```bash theme={null}
docker pull maximhq/bifrost:v1.5.6
docker run -p 8080:8080 maximhq/bifrost:v1.5.6
```
## ✨ Features
* **Direct API Key Header** - Pass a provider API key directly via request header (#3817)
* **MCP Per-User Authentication** - New per-user header auth type with credential storage and lazy-auth submission flow (#3703, #3704, #3705)
* **MCP TLS Configuration** - Configurable TLS (insecureSkipVerify, caCertPem) for HTTP/SSE MCP client connections (#3779, #3783)
* **MCP Sessions Management** - Filter, search, and pagination on the MCP sessions list API and table, plus a can\_reauth identity gate (#3823, #3824, #3825)
* **Tool Call Execution UI** - Inline tool-call execution, stop streaming, bulk execute/submit, and a redesigned tool-call UI (#3837, #3843)
* **Dimension Rankings Dashboard** - New dashboard tabs for team, customer, BU, and user rankings, backed by a GetDimensionRankings API (#3766)
* **Model Pricing Attributes** - additional\_attributes on model pricing rows with management API and UI editor (#3829)
* **Prompt Cache Retention** - Prompt cache retention parameter on responses requests (#3810)
* **Opus 4.8 Support** - System message handling and compatibility for Opus 4.8 (#3878, #3868)
* **Key Rotation** - Rotate keys on 401/402/403 and return 502 upstream\_credentials\_exhausted when all keys are permanently dead (#3491)
* **OTel Metrics** - OTel spec compatible metrics plus provider and semantic cache attributes in metrics export (#3865, #3816)
* **Sheet Navigation** - Prev/next keyboard navigation and URL state across virtual key, MCP client, and routing rule sheets (#3739, #3740, #3744, #3745)
* **Go 1.26.3** - Upgraded toolchain to Go 1.26.3 (#3782)
## 🐞 Fixed
* **Bedrock Tool Names** - Truncate Bedrock function/tool names to the provider length limit
* **Bedrock Guardrails** - Set guardrail config in Bedrock request built from responses (#3862)
* **Anthropic Tool Use** - Default Anthropic tool\_use input to {} when arguments are absent (#3880)
* **Responses Streaming** - Fixed responses stream events (#3838)
* **Compat Flow** - Fixed missing parameter parsing on the compat flow (#3881)
* **Passthrough API Version** - Set a default API version in passthrough requests as a fallback (#3853)
* **Virtual Key Updates** - Avoid overriding optional fields during virtual key update (#3855)
* **User-Mode Flows** - Gate user-mode flows on caller user\_id, skip temp token mint, and unify flow/credential kind filtering for pending flows (#3841, #3859)
* **Partial Tool Calls** - Handle partial tool call execution failures and return successful results (#3849)
* **URL Query Escaping** - Support escaped characters in URL query parameters (#3826)
* **MCP Auth Errors** - Inline banner and retry support for MCP auth-required errors (#3856)
* **JSON Editor Height** - Cap JSON editor max height at 400px in message views (#3842)
* feat: add direct API key header support (#3817)
* feat: introduce MCPCredentialStore abstraction and per-user MCP credential reconciliation (#3656, #3702, #3705)
* feat: add MCP per-user headers auth type with credential storage (#3703)
* feat: add TLS configuration support for MCP HTTP/SSE client connections (#3779)
* feat: propagate request context through MCP client connection (#3768)
* feat: rotate keys on 401/402/403 and return 502 upstream\_credentials\_exhausted when all keys are permanently dead (#3491)
* feat: add triggered\_rotation to KeyAttemptRecord and tighten bifrost\_key\_rotation\_events\_total semantics (#3430)
* feat: add OTel spec compatible metrics, backward compatible (#3865)
* feat: add provider cache and semantic cache attributes in metrics export (#3816)
* feat: add additional\_attributes to model pricing rows (#3829)
* feat: system messages handling for Opus 4.8 (#3878)
* fix: Opus 4.8 compatibility (#3868)
* fix: truncate Bedrock function/tool names to the provider length limit
* fix: set guardrail config in Bedrock request from responses (#3862)
* fix: default Anthropic tool\_use input to {} when arguments are absent (#3880)
* fix: responses stream events (#3838)
* fix: missing parameter parsing on compat flow (#3881)
* fix: set default api version in passthrough requests as a fallback (#3853)
* fix: add prompt cache retention parameter on responses request (#3810)
* fix: avoid overriding optional fields in virtual key update (#3855)
* refactor: expose RunWithPluginPipeline on ClientManager and route Starlark nested tool calls through the canonical plugin gate (#3794)
* refactor: rename staticHeadersResolver/serverOAuthResolver to sharedHeadersResolver/sharedOAuthResolver (#3840)
* chore: upgrade to Go 1.26.3 (#3782)
* feat: add direct API key header support (#3817)
* feat: add GetDimensionRankings API and ranking dimensions for team, customer, BU, and user (#3766)
* feat: add additional\_attributes to model pricing rows with management API (#3829)
* feat: add filter/search/pagination to MCP sessions list API (#3824)
* feat: add TLS configuration support for MCP HTTP/SSE client connections (#3779)
* feat: add OTel spec compatible metrics, backward compatible (#3865)
* feat: reconcile per-user MCP credentials on VK and MCP client changes (#3705)
* feat: add MCP per-user headers auth type with credential storage (#3703)
* feat: add metadata to hybrid store payload
* feat: log database type when connecting in NewConfigStore (#3724)
* feat: remove SSO gate check for temp token auth (#3814)
* fix: add user\_name to RankingDimensionUser column definition (#3869)
* fix: gate user-mode flows on caller user\_id and skip temp token mint (#3841)
* fix: make MCP header temp token flow follow the UI toggle (#3836)
* fix: increase matview sync interval to 1 min (#3886)
* refactor: remove deferred-fill user-mode OAuth flow support (#3839)
* chore: upgrade to Go 1.26.3 (#3782)
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* feat: add MCP per-user headers auth type support (#3703)
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* feat: support dimension rankings logging for team, customer, BU, and user (#3766)
* refactor: route Starlark nested tool calls through the canonical plugin pipeline (#3794)
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* feat: add provider cache and semantic cache attributes in metrics export (#3816)
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* chore: upgraded core to v1.5.14 and framework to v1.3.14
* feat: tighten bifrost\_key\_rotation\_events\_total semantics with triggered\_rotation (#3430, #3491)
* feat: add provider cache and semantic cache attributes in metrics export (#3816)
* chore: upgraded core to v1.5.14 and framework to v1.3.14