> ## 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.

# v2.1.26

> Helm v2.1.26 changelog - 2026-07-06

<Update label="Bifrost Helm" description="v2.1.26">
  ## Changelog

  * `bifrost.client.mcpServerAuthMode` (`headers` | `both` | `oauth`) and `bifrost.client.oauth2ServerConfig` (`issuerUrl`, `authCodeTtl`, `accessTokenTtl`, `disableVkIdentity`) to control how `/mcp` authenticates inbound MCP clients. `authCodeTtl` is capped at 900 seconds. Render into `client.mcp_server_auth_mode` and `client.oauth2_server_config`.
  * ClickHouse logs store: set `storage.logsStore.type: clickhouse` with a `storage.logsStore.clickhouse` block (`host` required; optional `port`, `database`, `username`, `password`, `protocol`, `secure`, `dialTimeout`, `cluster`).
  * `bedrock_mantle` provider with `bedrock_mantle_key_config` (`region` required; optional `access_key`, `secret_key`, `session_token`, `role_arn`, `external_id`, `session_name`).
  * `deepseek` provider support via the generic provider passthrough.
  * `toolExecutionTimeout` on `bifrost.mcp.clientConfigs[]` — a per-server override of the global `toolManagerConfig.toolExecutionTimeout`. Accepts a Go duration string (e.g. `"30s"`) or a bare integer treated as seconds.
  * `expires_at` on `bifrost.governance.virtualKeys[]` — optional RFC3339 timestamp after which requests using the virtual key are rejected. Omit for a key that never expires.
</Update>