Function createServer

createServer(
    config: B2Config,
    capabilities?: string[] | null,
    options?: CreateServerOptions,
): McpServer
Build the MCP server and register the B2 tool surface.

Registration is capability-aware: when capabilities is a non-null array, only tools the key can use are registered (per src/utils/tool-capabilities), and Partner tools register only with a distinct master key. null/undefined registers the full surface (operator override and legacy unit tests); an empty array is a fail-closed capability set, not "unknown".

Credential model: B2_APPLICATION_KEY_ID / B2_APPLICATION_KEY is the application key that drives the B2 native API, S3, and key management. Only the Partner API tools use a master key (B2_MASTER_KEY_ID / B2_MASTER_KEY, optional); a single non-master key covers everything else. B2's S3 endpoint rejects master keys, which is why the application key is the primary credential.
Parameters
- config: B2Config
  Resolved B2 credentials and runtime policy.
- Optionalcapabilities: string[] | null
  Capabilities returned by B2 authorize, null for the full-surface operator override, or an empty array to fail closed.
- options: CreateServerOptions = {}
  Optional caller-scoped controls such as verified OAuth scopes.
Returns McpServer
The configured MCP server instance.
Example
```
const config = loadConfig();
const capabilities = await fetchCapabilities(config);
const server = createServer(config, capabilities);
```
- Defined in server.ts:244