manager: add update_meta_inputs tool to update flake.lock on demand (closes #235)

hive-ag3nt/src/mcp.rs

@@ -807,6 +807,14 @@ pub struct RequestApplyCommitArgs {
     pub description: Option<String>,
 }
 
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+pub struct UpdateMetaInputsArgs {
+    /// Flake input names to update (e.g. `["bitburner-agent", "nixpkgs"]`).
+    /// Pass an empty list to update ALL inputs.
+    #[serde(default)]
+    pub inputs: Vec<String>,
+}
+
 #[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
 pub struct GetLogsArgs {
     /// Logical agent name to fetch logs for (e.g. `gui`, `hm1nd`).
@@ -1022,6 +1030,38 @@ impl ManagerServer {
         .await
     }
 
+    #[tool(
+        description = "Run `nix flake update` on the meta flake and commit the resulting \
+        `flake.lock` changes. Pass specific input names to update only those inputs \
+        (e.g. `[\"bitburner-agent\"]`), or pass an empty list to update ALL inputs. \
+        Blocks until the lock step completes (~30-120s depending on download size). \
+        Does NOT trigger container rebuilds — call `update` on each affected agent \
+        separately after the lock settles."
+    )]
+    async fn update_meta_inputs(
+        &self,
+        Parameters(args): Parameters<UpdateMetaInputsArgs>,
+    ) -> String {
+        let log = format!("{args:?}");
+        run_tool_envelope("update_meta_inputs", log, async move {
+            let label = if args.inputs.is_empty() {
+                "all inputs".to_string()
+            } else {
+                args.inputs.join(", ")
+            };
+            let (resp, retries) = self
+                .dispatch(hive_sh4re::ManagerRequest::UpdateMetaInputs {
+                    inputs: args.inputs,
+                })
+                .await;
+            annotate_retries(
+                format_ack(resp, "update_meta_inputs", format!("lock updated: {label}")),
+                retries,
+            )
+        })
+        .await
+    }
+
     #[tool(
         description = "Surface a structured question to either the operator OR a sub-agent. \
         Returns immediately with a question id — do NOT wait inline. When the recipient \