Pin the 5 public functions adapters and the runtime hot-path import
through ``from platform_auth import``:
- ``auth_headers`` — every outbound httpx call merges this in
- ``self_source_headers`` — A2A peer + self-message header builder
- ``get_token`` — main.py reads on boot to decide register-vs-resume
- ``save_token`` — main.py persists the platform-issued token
- ``refresh_cache`` — 401-retry path drops in-process cache (#1877)
A grep across workspace/ shows 14+ runtime modules import these:
main.py, heartbeat.py, a2a_client.py, a2a_tools.py, consolidation.py,
events.py, executor_helpers.py (3 sites), molecule_ai_status.py,
builtin_tools/memory.py (3 sites), builtin_tools/temporal_workflow.py
(2 sites). Renaming any of the five (e.g. ``auth_headers`` →
``bearer_headers``) makes every one of those imports raise ImportError
at workspace boot — the failure surface is deep in heartbeat init,
nowhere near the rename site.
Same drift class as the BaseAdapter signature snapshot (#2378, #2380),
skill_loader gate (#2381), runtime_wedge gate (#2383). Reuses the
``_signature_snapshot.py`` helpers shipped in #2381.
Defense-in-depth: ``test_snapshot_has_required_functions`` asserts
the five names are still present, so removing one even with a
synchronized snapshot edit forces an explicit edit here with a
justification.
``clear_cache`` is intentionally NOT in the snapshot — it's a
test-only helper. Production code MUST NOT depend on it.
Verified red on deliberate rename: ``auth_headers`` →
``bearer_headers`` produces a clean diff of the missing function in
the failure message. Restored before commit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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