Provider exceptions may expose numeric error_type or error_code values. Convert those fields at the response boundary before fallback consumers apply string operations, and cover the behavior with a regression test.
Plain tool values (grep patterns, web_search/x_search queries, find_files
globs) were never truncated by format_tool_hints(), so long arguments
overflowed tool_hint_max_length and were pushed to chat/UI verbatim.
Add a hard-truncation fallback for the plain branch, mirroring the existing
truncation used by abbreviate_path / _abbreviate_command. This completes the
same class of fix started in 99209a80 for is_path tools.
Adds 4 regression tests to tests/agent/test_tool_hint.py.
`_listener_is_serving()` probes `SO_ACCEPTCONN` to decide whether a bound
socket is still accepting connections. That option is not portable: macOS
and the BSDs raise `OSError` with `ENOPROTOOPT` ("Protocol not available")
for it even on a perfectly healthy listening socket.
The surrounding `except OSError: return False` swallows that error, so the
listener is reported as degraded on every check. `_serve_forever()` then
raises `_ListenerUnavailableError("WebSocket listener did not enter a
serving state")`, and because `_is_recoverable_listener_error()` classifies
that exception as recoverable, the channel retries forever (4s -> 8s -> 16s
-> 30s backoff) and never becomes ready. On macOS this leaves the gateway
permanently at `ready: false` with the WebUI unreachable, since the
WebSocket channel is enabled by default.
Reproduced on macOS 26.5.1 / Python 3.14.3:
>>> s = socket.socket(); s.bind(("127.0.0.1", 0)); s.listen(1)
>>> s.getsockopt(socket.SOL_SOCKET, socket.SO_ACCEPTCONN)
OSError: [Errno 42] Protocol not available
Extract `_socket_is_accepting()` and treat `ENOPROTOOPT` / `EOPNOTSUPP` /
`EINVAL` as "this platform cannot answer the question", falling back to the
file-descriptor liveness check that already guarded the expression. Other
`OSError`s still propagate, and a closed socket is still rejected via the
`fileno() < 0` short circuit, so Linux behaviour is unchanged.
* refactor(agent): unify runner request fitting
* fix(agent): fit every runner model request
* fix(agent): count resumed state during request fitting
* refactor(agent): consolidate request fitting state
* refactor(agent): defer transcript assembly to runner
Keep persisted history and the fresh turn as explicit inputs until the Runner assembles the provider transcript. Preserve ContextBuilder and direct AgentRunner compatibility while making the save boundary structural.
Refs NAN-81.
* fix(providers): preserve mixed adjacent user content
* refactor(agent): decouple loop from message tool state
* refactor(agent): scope message delivery tracking per run
* refactor(agent): clarify message delivery scope name
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