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agents: remove the hive-level /model control; the swarm editor sets the model

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The per-agent web UI no longer sets the model: the `/model` slash
command, the model picker, `POST /api/model`, `Bus::set_model` and the
`hyperhive-model` writer are gone. The model chip is display-only and
shows where the model comes from (`model_source` in `/api/state`). The
model is set on the swarm (swarm UI agents page, `swarmctl agent
inference set`).

The read side is unchanged: with no swarm value an agent runs its
agent.nix model, else an existing `hyperhive-model` file, else haiku.
Existing files are not touched.

With the picker gone, its model list goes too: `available_models` in
`/api/state`, the ACP model-list filter, and the harness's global
`HIVE_AVAILABLE_MODELS`. The subagent daemon keeps its own
`HIVE_AVAILABLE_MODELS` from mcp.nix, and the `availableModels`
assertion stays.

`/effort` (command, picker, route, file) is unchanged.

Refs #5034
This commit is contained in:
atlas 2026-10-10 23:06:15 +02:00
commit 594693f4c7
26 changed files with 244 additions and 425 deletions
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13
docs/turn-loop/claude-invocation.md
View file

@ -50,13 +50,12 @@ live, which managed scope would otherwise lock.
The harness reads `<name>` from `Bus::model()` on each turn.
`services.hyperhive.agent.model` in the agent's `agent.nix` sets the initial
default (NixOS option; propagates via `HIVE_DEFAULT_MODEL` env var; falls
back to `"haiku"` if unset). The operator can flip it at runtime
with `/model <name>` in the web terminal — the next turn picks it
up. The harness persists the choice to `/harness/hyperhive-model` so it
survives restart; override path: `HYPERHIVE_MODEL_FILE` env var
for tests. A model or effort the swarm sets for the agent replaces the
`Bus` value, and the harness doesn't persist it; clearing it goes back to
the persisted or nix value → [`swarm/inference.md`](../swarm/inference.md).
back to an existing `/harness/hyperhive-model` file, then `"haiku"`, if
unset). The swarm changes the model at runtime, not the web
terminal: a model or effort the swarm sets for the agent replaces the
`Bus` value from the next turn, and the harness doesn't persist it;
clearing it goes back to the local value →
[`swarm/inference.md`](../swarm/inference.md).
`harness_state::context_window_tokens(model)` looks up
context-window size per-model. Resolution order (first