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🐾 fix: resolve registry capabilities per agent, not once globally

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_build_registry built one capabilities dict from the global default_model and
attached it to every entry, so any agent with an `agents.<name>.model` or
`model_capabilities` override was advertised under the wrong model — even
though server.py applies those overrides at startup. Resolve capabilities per
agent, mirroring _register_unknown_models.

Also stop emitting null context_window / max_output_tokens when
model_capabilities is absent: _register_one_model registers the model with
131072 / 16384, so the registry now advertises those effective values. The
defaults are hoisted to module constants in server.py so the two cannot drift.

Verified against mentor's config: capabilities go from
{"context_window": null, "max_output_tokens": null} to {131072, 16384}, model
name unchanged. No checked-in deployment uses per-agent overrides today, so no
currently-published model changes.

Adds tests/test_registry.py (9 tests, first coverage for registry.py) and
documents agents.<name>.model / model_capabilities, which the agents.yaml
field table omitted entirely.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Robert Helewka
2026-08-03 12:22:30 -04:00
parent 5af198911b
commit 73f6afdbf8
5 changed files with 258 additions and 26 deletions
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2
docs/pallas_integration.md
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@@ -120,7 +120,7 @@ No authentication. No query parameters.
| `servers[].server.version` | string | no | Semver version string. |
| `servers[].server.icons` | array | no | Array of `{ src, sizes }`. Daedalus uses the first entry. |
| `servers[].server.remotes` | array | yes | Connection endpoints. Daedalus looks for `type: "streamable-http"` and uses its `url`. |
| `servers[].server.capabilities` | object | no | Model capabilities. Contains `model` (string), `vision` (bool), `context_window` (int), `max_output_tokens` (int). Published when `model_capabilities` is configured in `fastagent.config.yaml`. |
| `servers[].server.capabilities` | object | no | Model capabilities. Contains `model` (string), `vision` (bool), `context_window` (int), `max_output_tokens` (int). Published whenever a model is known for the agent (`agents.<name>.model` or `default_model`); resolved per agent, with omitted fields falling back to the defaults Pallas registered the model with. |
| `servers[]._meta` | object | no | Registry metadata. Informational only — Daedalus does not act on it. |
#### Behaviour