Policy carries an operator-declared model_capabilities directory
and per-tier requires (tool_calling/reasoning/vision booleans,
min_context_tokens). decide_routing checks the policy tier model
in active mode: capable applies, incapable falls back to a capable
worker default, and if both fail or are unknown it returns
capability_blocked, which the worker turns into a failed task
(v3 tools-gate shape, runner never called). Shadow mode only
annotates the reason, never blocks. Explicit task and worker CLI
models bypass the check by design. Invalid requires drops only
that tier (fail-closed, like invalid tier mode). Dry-run reports
per-tier capability status and blocks on active tiers that fail
or cannot be verified.
New module cloud/routing_dryrun.py: dry-run a merged policy
document or an env mapping (file first, JSON overrides whole
tier entries, CLOUD_ROUTING_MODE overrides global mode only,
never explicit tier modes), reporting per-tier effective
model/mode/mode-source, dropped tiers with reasons, absent and
unknown tiers, and would_activate/would_shadow/would_off.
Dropped or unknown tiers block (CLI exit 1); warnings alone
(no version, fallback_models parsed but not applied, failed
file/JSON sources that the loader silently ignores) do not
block but are always printed. Model names are NOT validated
against a catalog (deliberately not whitelisted) and sample
counts are NOT checked here (that is the shadow report's job);
the CLI never writes env, files, or worker state.
Tests: test_routing_dryrun.py (8 tests).
host