The chat route repeated the compact (clean v3) eligibility decision inline
to prepare the turn's context resolution, while the agent loop dispatched
on the contract stamp set by a separate, later condition. The two could
drift, and already disagreed for a user whose privileges demote the turn
to plain chat: the route prepared a compact resolution that no compact
runtime used.
src/agent_runtime/runtime_selection.py (no imports) now owns the rule:
- uses_compact_preview_runtime(): clean route requested, contract policy
enabled, agent mode, agent permitted, not an image generation session.
- is_compact_preview_contract() and COMPACT_PREVIEW_MODE for the stamp.
The route evaluates the rule once, before context preparation, where all
of its facts are final (the agent privilege is read through the same
_request_privileges helper the later enforcement uses). That one value
gates the typed context resolution and is the _clean_v3_preview flag that
stamps the contract; inside the agent-contract branch it equals the
previous condition, so stamping behavior is unchanged. The agent loop
dispatches through is_compact_preview_contract(), and the compact runtime's
MODE is the shared constant.
A route-level matrix drives the real agent loop and asserts that route
preparation and compact dispatch agree for compact, escalated, configured
compact/full, regular, TUI, privilege-denied and image-generation turns.
Alexandre Teixeira
57fe9946c2