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subagents: add availableToSubagents opt-in toggle for extraMcpServers

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damocles 2026-09-13 13:18:27 +02:00 • committed by mara
commit 16eec3c314
14 changed files with 356 additions and 84 deletions
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18
docs/tools/subagent.md
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@ -54,3 +54,21 @@ agent that needs a stable or non-default port.
Own systemd unit, defined alongside the other per-agent MCP daemons in
`nix/agent-modules/mcp.nix`.
## MCP servers available to a subagent
A subagent runs with `--strict-mcp-config` and no `--mcp-config` by
default — zero MCP servers, full stop; it falls back to claude's own
native tools (`Bash`, `WebFetch`, etc.), not the parent's `mcp__bash__*` /
`mcp__hyperhive__*` surface. Nothing implicit reaches it: the built-in
hyperhive surface (todos/messaging) isn't an `extraMcpServers` entry at
all, and the auto-injected `bash`/`subagent` entries default to excluded
too (a subagent can't spawn hive-bash tasks or its own nested subagents
unless an operator opts them in explicitly, same as anything else).
Set `hyperhive.extraMcpServers.<name>.availableToSubagents = true` on a
specific entry to hand that one server to subagents as well — useful for,
say, a read-only lookup or scraper MCP a subagent's bounded, single-batch
task might need. `hive-subagent-mcp`'s `mcp_config` module renders the
opted-in subset into its own `--mcp-config` file per turn; an entry left
at the default `false` never appears there.