this derivation will be built:
  /nix/store/jz01j5dq0bv6vhfrax2af6aqlc4abbd7-treefmt-check.drv
building '/nix/store/jz01j5dq0bv6vhfrax2af6aqlc4abbd7-treefmt-check.drv'
treefmt-check> treefmt v2.6.0traversed 606 files
treefmt-check> emitted 394 files for processing
treefmt-check> formatted 394 files (2 changed) in 889ms
treefmt-check>  M packages/spaces-integration-gateway/gateway-core.ts
treefmt-check>  M tests/inference.nix
treefmt-check> diff --git a/packages/spaces-integration-gateway/gateway-core.ts b/packages/spaces-integration-gateway/gateway-core.ts
treefmt-check> index 2fac038..94e9c0d 100644
treefmt-check> --- a/packages/spaces-integration-gateway/gateway-core.ts
treefmt-check> +++ b/packages/spaces-integration-gateway/gateway-core.ts
treefmt-check> @@ -113,8 +113,7 @@ export interface McpStep {
treefmt-check>  }
treefmt-check>  
treefmt-check>  export type McpExchangeResult =
treefmt-check> -  | { ok: true; reply: Record<string, unknown> }
treefmt-check> -  | { ok: false; reason: string };
treefmt-check> +  { ok: true; reply: Record<string, unknown> } | { ok: false; reason: string };
treefmt-check>  
treefmt-check>  /**
treefmt-check>   * One MCP exchange on a fresh unix-socket connection, the "MCP wire". It speaks
treefmt-check> diff --git a/tests/inference.nix b/tests/inference.nix
treefmt-check> index 827865f..c75d810 100644
treefmt-check> --- a/tests/inference.nix
treefmt-check> +++ b/tests/inference.nix
treefmt-check> @@ -159,7 +159,8 @@ in
treefmt-check>          (sys [
treefmt-check>            alice
treefmt-check>            on
treefmt-check> -        ]).services.hermes-microvm.settings ? providers;
treefmt-check> +        ]).services.hermes-microvm.settings
treefmt-check> +          ? providers;
treefmt-check>        expected = false;
treefmt-check>      };
treefmt-check>    };
error: Cannot build '/nix/store/jz01j5dq0bv6vhfrax2af6aqlc4abbd7-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/iqqv0xv2bmi5hm18xk4yijz1rlh2z7lk-treefmt-check
       Last 25 log lines:
       > +++ b/packages/spaces-integration-gateway/gateway-core.ts
       > @@ -113,8 +113,7 @@ export interface McpStep {
       >  }
       >  
       >  export type McpExchangeResult =
       > -  | { ok: true; reply: Record<string, unknown> }
       > -  | { ok: false; reason: string };
       > +  { ok: true; reply: Record<string, unknown> } | { ok: false; reason: string };
       >  
       >  /**
       >   * One MCP exchange on a fresh unix-socket connection, the "MCP wire". It speaks
       > diff --git a/tests/inference.nix b/tests/inference.nix
       > index 827865f..c75d810 100644
       > --- a/tests/inference.nix
       > +++ b/tests/inference.nix
       > @@ -159,7 +159,8 @@ in
       >          (sys [
       >            alice
       >            on
       > -        ]).services.hermes-microvm.settings ? providers;
       > +        ]).services.hermes-microvm.settings
       > +          ? providers;
       >        expected = false;
       >      };
       >    };
       For full logs, run:
         nix log /nix/store/jz01j5dq0bv6vhfrax2af6aqlc4abbd7-treefmt-check.drv