remove the list_containers and request_update_meta_inputs MCP tools

Both agent-facing tools go away end to end, with no replacement. This is
an intentional capability removal: agents can no longer enumerate their
own subtree, and can no longer queue a meta-flake input bump.

The system prompt and docs/tools/lifecycle.md land in this same commit
on purpose. A tool named in the prompt but absent from the server makes
agents confidently call something that doesn't exist, and the failure
then surfaces far from its cause.

Removed:

- MCP registrations and bodies (hive-agent-mcp), plus the now-unused
  UpdateMetaInputsArgs.
- Wire variants Request::ListDescendants,
  Request::RequestUpdateMetaInputs and Response::Containers, plus
  ContainerInfo, whose only consumer was that response.
- hive-c0re's handle_list_descendants (its whole module) and
  handle_request_update_meta_inputs, the two dispatch arms, and the
  require_group(agent, "approvals", ...) gate on the meta-inputs verb.
- The stream_enrich emoji entry and argument formatter.
- docs/tools/lifecycle.md (both tools it documented are gone), its two
  referrers, the tool-group tables and the agent-hierarchy prose.

Tool groups are kept, deliberately. ToolGroup::Lifecycle listed exactly
one tool and now lists none — it is vestigial, but the variant stays so
existing meta/capabilities.json grants still parse; retiring it is a
separate decision. ToolGroup::Approvals also listed exactly one tool,
but the group is NOT dead: check_can_cancel_approval still gates
cancel_loose_end's approval-cancel arm on it server-side.

ApprovalKind::UpdateMetaInputs stays too. Nothing in production code
produces it any more, but pre-existing approval rows may still carry it,
and the operator's own path to a meta update is unaffected — the
dashboard's POST /api/meta-update inserts the meta_update job directly,
bypassing approvals entirely.

The two format_ack tests in hive-agent-mcp that named
request_update_meta_inputs were only using it as a label string while
exercising the generic OkWarn/Ok renderer, so they are retargeted to a
surviving tool rather than deleted.

Note hive-c0re's priv_client::list_containers is a different thing (the
host-side privileged container listing behind hive-priv) and is
untouched.

Closes #4591

hive-agent-mcp/src/mcp/args.rs

@@ -131,17 +131,6 @@ pub struct CancelLooseEndArgs {
     pub id: i64,
 }
 
-#[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>,
-    /// Optional description shown on the dashboard approval card.
-    #[serde(default)]
-    pub description: Option<String>,
-}
-
 #[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
 pub struct RequestSchedulePromptArgs {
     /// Recipient agents — one schedule fires to many inboxes at the

hive-agent-mcp/src/mcp/mod.rs

@@ -26,7 +26,7 @@ mod render;
 pub use args::{
     AckUntilArgs, CancelLooseEndArgs, CancelScheduleArgs, CompactArgs, CreateRepoArgs,
     EditScheduleArgs, FireScheduleNowArgs, GetAgentMetaArgs, GetHostJournalArgs, MarkTodosDoneArgs,
-    RecvArgs, RemindArgs, RequestSchedulePromptArgs, SendArgs, SetStatusArgs, UpdateMetaInputsArgs,
+    RecvArgs, RemindArgs, RequestSchedulePromptArgs, SendArgs, SetStatusArgs,
 };
 pub use render::{annotate_retries, format_ack, format_agent_meta, format_recv};
 
@@ -547,44 +547,6 @@ impl AgentServer {
         .await
     }
 
-    // IMPORTANT: this tool is only available when the `lifecycle` tool group
-    // is granted to this agent. Returns the calling agent's whole subtree,
-    // itself included, with running status.
-    #[tool(
-        description = "List this agent's whole subtree — children, their children, and so on \
-            down — with running status. The calling agent is part of its own subtree, so it \
-            appears in the listing too. Requires the `lifecycle` tool group. \
-            Returns every known descendant regardless of running state — check the `running` \
-            field to distinguish live from stopped containers. Ordered by topology depth \
-            (parents before children), then alphabetically within each tier."
-    )]
-    async fn list_containers(&self) -> String {
-        run_tool_envelope("list_containers", String::new(), async move {
-            let (resp, retries) = self
-                .dispatch(hive_core_agent_sock::Request::ListDescendants)
-                .await;
-            let body = match resp {
-                Ok(hive_core_agent_sock::Response::Containers { containers }) => {
-                    if containers.is_empty() {
-                        "no descendant containers".to_owned()
-                    } else {
-                        containers
-                            .iter()
-                            .map(|c| {
-                                let status = if c.running { "running" } else { "stopped" };
-                                format!("{} ({})", c.name, status)
-                            })
-                            .collect::<Vec<_>>()
-                            .join("\n")
-                    }
-                }
-                other => reply_err(other, "list_containers"),
-            };
-            annotate_retries(body, retries)
-        })
-        .await
-    }
-
     // IMPORTANT: this tool is capability-gated (`read_host_journal`).
     // It is added to `--allowedTools` by `allowed_capability_tools` only
     // when `HIVE_CAPABILITIES` contains `read_host_journal`. hive-c0re
@@ -627,43 +589,6 @@ impl AgentServer {
         .await
     }
 
-    #[tool(
-        description = "Queue an approval for the operator to run `nix flake update` on the \
-        meta flake and commit the resulting lock changes. Pass specific input names to update \
-        only those inputs (e.g. `[\"bitburner-agent\"]`), or pass an empty list to update ALL \
-        inputs. Returns immediately — the lock update runs when the operator approves. \
-        Does NOT trigger container rebuilds — the operator rebuilds affected agents \
-        after the approval resolves."
-    )]
-    async fn request_update_meta_inputs(
-        &self,
-        Parameters(args): Parameters<UpdateMetaInputsArgs>,
-    ) -> String {
-        let log = format!("{args:?}");
-        run_tool_envelope("request_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_core_agent_sock::Request::RequestUpdateMetaInputs {
-                    inputs: args.inputs,
-                    description: args.description,
-                })
-                .await;
-            annotate_retries(
-                format_ack(
-                    resp,
-                    "request_update_meta_inputs",
-                    format!("approval queued: {label}"),
-                ),
-                retries,
-            )
-        })
-        .await
-    }
-
     #[tool(
         description = "Queue an approval to add a scheduled prompt — one body delivered to \
         N agent inboxes at a target time, optionally recurring every `interval_seconds`. \

hive-agent-mcp/src/mcp/render.rs

@@ -643,12 +643,12 @@ mod tests {
             Ok(hive_core_agent_sock::Response::OkWarn {
                 warnings: vec!["name is reserved".to_owned(), "second thing".to_owned()],
             }),
-            "request_update_meta_inputs",
-            "update_meta_inputs approval queued".to_owned(),
+            "request_schedule_prompt",
+            "schedule approval queued".to_owned(),
         );
         // The operation HAPPENED — dropping the success line would read as a
         // failure and invite a retry that queues a second approval.
-        assert!(out.starts_with("update_meta_inputs approval queued"));
+        assert!(out.starts_with("schedule approval queued"));
         assert!(out.contains("⚠️ name is reserved"));
         assert!(out.contains("⚠️ second thing"));
     }
@@ -659,7 +659,7 @@ mod tests {
         // warning marker would pass the test above.
         let out = format_ack(
             Ok(hive_core_agent_sock::Response::Ok),
-            "request_update_meta_inputs",
+            "request_schedule_prompt",
             "queued".to_owned(),
         );
         assert_eq!(out, "queued");