20 `plugins/platforms/*/adapter.py::_standalone_send` paths (the out-of-process cron /
send_message delivery) built `{"error": f"... {e}"}` by hand — 83 literals. The exception text
of an httpx/aiohttp failure can carry the Authorization header, a signed URL or a response body
with the token in it, and that string became the tool result the model reads. Only sms went
through the redacting `tools.send_message_senders._error`; discord kept a private regex that
only knew `Authorization: Bot`.
`gateway.platforms._shared.send_error(message)` wraps that helper (agent.redact +
URL-secret scrub) and every standalone literal now goes through it, including the three
envelopes that carry extra keys (discord warnings, photon error_class/retryable, whatsapp's
`(None, err)` tuple). The sms and discord local wrappers are deleted. Telegram already
delegated to the core sender and is untouched.
Behavior change (security): vendor exception text in standalone-send failures is redacted
before reaching the model.
73eadd54f5