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atlas f189724a4c hive-runtime, hive-agent: model/effort picker for ACP agents from configOptions 
An ACP agent's model and effort pickers now list what its session offers
(its `model` and `thought_level` config options) instead of the claude
model list and EFFORT_LEVELS. A pick goes through the same Bus::set_model /
Bus::set_effort -> Config.model / Config.effort path as on claude; before
each prompt the ACP runtime sets it with `session/set_config_option`, model
first, and only when the session offers that value. Options are re-read
from the set response and from `config_option_update`, so the effort picker
disappears when the chosen model offers no effort levels, and is hidden
while a newly picked model waits for the next turn.

The session's options reach the web UI through a `Choices` handle from a
new `Runtime::choices`, registered on the bus the way `canceller` is.
/api/model and /api/effort accept only offered values on ACP. The claude
path is unchanged.

Refs #4391
2026-09-30 10:53:53 +02:00
..
src hive-runtime, hive-agent: model/effort picker for ACP agents from configOptions 2026-09-30 10:53:53 +02:00
Cargo.toml hive-runtime: record a new ACP session only once its first prompt is answered 2026-09-29 22:29:36 +02:00
README.md hive-runtime, hive-agent: model/effort picker for ACP agents from configOptions 2026-09-30 10:53:53 +02:00

README.md

hive-runtime

The layer an agent's turns are driven through: one Runtime interface (run, compact, archive, canceller, choices) with a backend per runtime.

  • claude — claude --print through the hive-claude crate's InfiniteSession. A pass-through: same spawn, same session handling, same errors.
  • acp — any Agent Client Protocol agent, spawned from a command, args and env handed to it (RuntimeSpec, read from HIVE_RUNTIME / HIVE_ACP_COMMAND / HIVE_ACP_ARGS / HIVE_ACP_ENV). It knows no agent by name; which agent runs, and how it is configured, is decided in nix (services.hyperhive.agent.runtime, services.hyperhive.agent.acp.*).

Both backends report a turn through hive_claude::Sink in claude's stream-json shape. The ACP backend translates session/update notifications into it (text and thought chunks as whole blocks, tool calls as tool_use + tool_result, MCP tools named mcp__<server>__<tool>), so the harness's stream consumers read either backend unchanged. Context usage comes from ACP usage_update.

The crate depends on no hyperhive binary crate, so hive-agent and hive-subagent-mcp can both drive turns through it.

ACP backend: what it needs from the agent

  • mcpCapabilities.http in its initialize response. The hyperhive tools are only served over HTTP, so an agent without it is refused at startup.
  • loadSession, to pick its session back up after a harness restart. Without it every restart starts a new session.

ACP backend: stopping a turn

A turn is stopped with session/cancel: by the Canceller handle, or by the idle watchdog once no session/update has arrived for Config::idle_timeout. An agent that has not answered the prompt 10s later is killed, and the next turn respawns it. A watchdog stop fails the turn with AcpError::IdleTimeout (IdleKilled if the agent was killed). This is the only way a provider error the agent retries without reporting it, such as an HTTP 429, ends the turn.

ACP backend: compaction

The same CompactionPolicy as the claude backend decides when: after a turn past the watermark, or on compact (the operator's /compact, the agent's compact tool).

  • If the agent advertises a compact command (available_commands_update), it is sent as the prompt /compact on the same session, as the ACP spec runs any advertised command. A proactive compaction runs the policy's checkpoint turn first, as on claude.
  • Otherwise the policy's checkpoint turn runs, then the session is archived, and the next turn starts a new one, carrying the system prompt again.
  • A compact command that fails, or sends nothing for 180s (the turn's idle window if that is shorter), is cancelled and handled as the case above; the checkpoint turn is not run a second time. So a compaction always leaves a smaller session behind, and a failed one is not retried on the next turn.

ACP backend: model and effort

Before each prompt, Config::model and then Config::effort are set on the session with session/set_config_option, as the value of its first model and thought_level config option. A value the session does not offer, or already holds, is not sent, so a claude alias such as haiku does nothing on an ACP agent. Model goes first because the effort levels on offer depend on it. The Choices handle (Runtime::choices) reads what the session offers now, including after a config_option_update. It is empty until a session is attached.