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hive-subagent-mcp: run an agent's subagents on its runtime

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The subagent daemon now reads the parent agent's runtime at startup
(`hive_runtime::RuntimeSpec`, from the harness's `HIVE_RUNTIME` /
`HIVE_ACP_*`, which `mcp.nix` forwards onto its unit). On claude
nothing changes. On ACP, each run drives an `AcpRuntime` whose session
id is kept per name under the harness dir: `start` archives the old one,
`continue` loads it (and fails when none is recorded), `interrupt` sends
`session/cancel`, a role goes in front of the first prompt, and
permission requests get the answers a claude subagent's tool list
gives. The unit loads `backendEnvironmentFile` on ACP only, so the
agent can authenticate.

The end-of-turn handling moves out of the claude loop into `after_turn`
unchanged, so both loops share it.

Refs #4391
This commit is contained in:
atlas 2026-09-30 01:39:21 +02:00 • committed by mara
commit 84d4808d54
10 changed files with 689 additions and 71 deletions
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4
nix/agent-modules/agent-service.nix
View file

@ -228,6 +228,10 @@ in
On `"acp"`, `model`, `effortLevel` and `autoCompact` have no effect
(the model is whatever the agent is configured with), and neither the
web UI's cancel button nor `/compact` works yet.
Subagents (`hive-subagent-daemon`) run on the same runtime. On
`"acp"`, each subagent run spawns its own copy of the ACP agent, which
also gets `services.hyperhive.agent.backendEnvironmentFile`.
'';
};

21
nix/agent-modules/mcp.nix
View file

@ -391,6 +391,13 @@ in
# `null` when the agent has no groups declared, which systemd drops
# — the same "absent" the harness itself would see.
HIVE_TOOL_GROUPS = config.systemd.services.hive-agent.environment.HIVE_TOOL_GROUPS or null;
# The harness's runtime selection, forwarded the same way, so an ACP
# agent's subagents run on its ACP agent. All four are absent on a
# claude agent, which the daemon reads as claude.
HIVE_RUNTIME = config.systemd.services.hive-agent.environment.HIVE_RUNTIME or null;
HIVE_ACP_COMMAND = config.systemd.services.hive-agent.environment.HIVE_ACP_COMMAND or null;
HIVE_ACP_ARGS = config.systemd.services.hive-agent.environment.HIVE_ACP_ARGS or null;
HIVE_ACP_ENV = config.systemd.services.hive-agent.environment.HIVE_ACP_ENV or null;
# Same `services.hyperhive.agent.availableModels` the harness's own assertions gate
# the primary session's model against, so a subagent can't be spawned
# on a model the operator didn't make available to this agent. The
@ -451,7 +458,19 @@ in
}
// lib.optionalAttrs (containerMemoryMaxBytes != null) {
MemoryHigh = toString subagentMemoryHigh;
};
}
//
lib.optionalAttrs
(
config.services.hyperhive.agent.runtime == "acp"
&& config.services.hyperhive.agent.backendEnvironmentFile != null
)
{
# An ACP subagent authenticates to its provider with the same
# credentials as the harness's ACP agent. Claude subagents are
# not handed this file.
EnvironmentFile = "-${config.services.hyperhive.agent.backendEnvironmentFile}";
};
};
# Persistent streamable-http MCP daemon for the built-in hyperhive