`lsp` is registered as a top-level subparser in `main()` (lines 9539-9545)
via `agent.lsp.cli.register_subparser`, so it shows up in `hermes --help`
output alongside the other built-ins. The `_BUILTIN_SUBCOMMANDS` set used
by `_plugin_cli_discovery_needed` to short-circuit the ~500-650ms plugin
import pass did not list it, so every `hermes lsp ...` invocation paid
the full discovery cost despite being a fully-built-in command.
This is also caught by the parity guard added in #22120:
`tests/hermes_cli/test_startup_plugin_gating.py::test_builtin_set_covers_every_registered_subcommand`
has been failing on clean origin/main with:
AssertionError: _BUILTIN_SUBCOMMANDS is missing these live
subcommands: ['lsp']. Add them to hermes_cli/main.py::_BUILTIN_SUBCOMMANDS
so plugin discovery can be skipped when the user targets them.
Fix: add `"lsp"` to the frozenset (alphabetical position between `logs`
and `mcp`). The accompanying `test_builtin_set_has_no_phantom_entries`
guard still passes because `lsp` is genuinely live — registered via the
guarded `try/except Exception` in main() since #24168.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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