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remove the get_host_journal MCP tool and its capability

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swarm-logs covers every host-tier unit this tool could reach, so the
second, capability-gated path into host journald earns nothing and is
removed outright rather than disabled behind a flag.

Removed end to end: the MCP tool definition + handler, the
GetHostJournal/HostJournal wire variants, hive-c0re's
dispatch_host_journal handler, the ReadHostJournal capability, and the
harness-side capability->--allowedTools gate. get_host_journal was the
only capability that mapped to an MCP tool, so allowed_capability_tools
could only ever return an empty vec; it goes too rather than linger as a
function that provably does nothing.

capabilities::has_cap/caps_for stay: #4624 gave ManageRootAgent's
bind-mount enforcement (hive-c0re/src/lifecycle/host_config.rs) a
second caller of has_cap, so they're no longer callerless once this
lands on top of it.

hive-sh4re's journal module (JournalPriority) had no consumer outside
this tool and is deleted.

An existing capabilities.json still naming read_host_journal does not
error: capabilities::prune_unknown drops unrecognised names with a
warn!, and an agent left with no capabilities has its entry removed. No
migration step is needed.

Untouched: hive-c0re/src/dashboard/journal.rs's
read_host_journal_response, which matches the name but is the private
helper behind the operator-only GET /api/journal-host dashboard route
and carries no capability check.
This commit is contained in:
atlas 2026-09-21 19:20:05 +02:00
commit 11097ed336
18 changed files with 21 additions and 401 deletions
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3
docs/process/conventions.md
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@ -363,11 +363,10 @@ that allows the underlying resource access.
| Capability | Effect |
|---|---|
| `manage_root_agent` | may manage *any* agent: bind-mounts every agent's state (rw) + config (ro) into the holder's container, plus `/applied` and `/meta` (ro). Takes effect on the holder's next container rebuild/restart |
| `read_host_journal` | registers the `get_host_journal` MCP tool + serves `GET /journal-host` requests |
**Config storage** — per-agent capabilities live in
`/var/lib/hyperhive/meta/capabilities.json` alongside `tool-groups.json`.
Format: `{ "atlas": ["read_host_journal"], "ruth": ["manage_root_agent"] }`.
Format: `{ "ruth": ["manage_root_agent"] }`.
An absent entry means "no extra capabilities." `render_flake` in `meta.rs`
reads this file and injects `HIVE_CAPABILITIES` (comma-separated
`snake_case` names) into each agent's systemd service env; absent entries emit