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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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21
nix/agent-modules/mcp.nix
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@ -124,6 +124,27 @@ in
`mcp__<server-key>__` at build time.
'';
};
availableToSubagents = lib.mkOption {
type = lib.types.bool;
default = false;
description = ''
Whether a claude subagent (`mcp__subagent__start`/`continue`,
served by `hive-subagent-daemon`) also gets this MCP server.
Default `false`: a subagent runs `--strict-mcp-config` with no
ambient MCP discovery, so this is the *only* path an
`extraMcpServers` entry reaches a subagent's own claude
invocation at all — leaving it unset keeps a subagent exactly
as narrow as before this option existed (its native built-in
tools only, zero MCP servers).
The auto-injected `bash` and `subagent` entries below stay at
this default — a subagent never gets hive-bash (it already has
claude's native `Bash` tool instead) or the ability to spawn
its own nested subagents, unless an operator opts a
*different* entry in explicitly. Set `true` on an entry (e.g.
a scraper or read-only lookup MCP) to hand it to subagents too.
'';
};
};
}
);