When the LLM returns an error (e.g. 429 quota exceeded, stream timeout),
streaming channels silently drop the error message because `_streamed=True`
is set in metadata even though no content was actually streamed.
This change:
- Skips setting `_streamed` when stop_reason is "error", so error messages
go through the normal channel.send() path and reach the user
- Stops appending error content to session history, preventing error
messages from polluting subsequent conversation context
- Exposes stop_reason from _run_agent_loop to enable the above check
The Tavily /usage endpoint returns a nested "account" object with
plan_usage/plan_limit/search_usage/etc fields, not the flat structure
with used/limit/breakdown that was assumed. This caused all usage
values to be None.
The /status command tried to access web search config via
`loop.config.tools.web.search`, but AgentLoop has no `config` attribute.
This caused the search usage lookup to silently return None, so web
search provider usage was never displayed.
Fix: use `loop.web_config.search` which is the actual attribute
set during AgentLoop.__init__.
yanghan-cyberandXubin Ren