Lands two complementary pieces of the eventual file-watcher hot-reload:
1) The diff machinery (pkg/teamloader/diff.go) that classifies a
freshly-loaded latest.Toolset slice against the running one as
Added / Removed / Changed / Unchanged. ToolsetIdentity gives each
entry a stable key (Type+Name when named, else Type+ref/cmd/url),
and ToolsetSignature is a hex SHA-256 over the full Toolset
JSON so adding new fields automatically participates in change
detection without further wiring. HasChanges() is a fast-path for
the future watcher.
2) An immediately-useful capability built on the supervisor: by-name
restart. Most users hit a 'gopls is stuck' or 'I just OAuth'd this
MCP and need it to reconnect' moment within minutes of using the
agent; today they have to restart the whole agent.
New tools.Restartable interface (Restart(ctx) error). Implemented
by mcp.Toolset and *builtin.LSPTool, both of which delegate to
supervisor.RestartAndWait under their respective timeouts.
Runtime gains RestartToolset(ctx, name); the remote runtime
refuses with a clear error since toolset lifecycle is server-side
for that case. App is a thin pass-through.
TUI: new RestartToolsetMsg, /toolset-restart slash command
('/toolset-restart gopls'), and a notification-toast handler that
surfaces success or the supervisor's error.
Tests:
* diff_test.go covers no-changes, added-only, removed-only,
changed-only, mixed (preserves order), identity matching for
named/unnamed toolsets across mcp/lsp/a2a, and signature
stability/discrimination.
* restart_test.go exercises name resolution and Restartable
dispatch in isolation.
Note on full hot-reload (file watcher + diff-driven apply):
Wiring the watcher into the agent so that Stop+Start of a single
toolset works in a live runtime is non-trivial (Agent.toolsets
needs a snapshot pattern, the tool dispatcher needs to swap
references atomically, and the runtime loop needs a quiescent
point). It is intentionally not in this commit. The pieces shipped
here \u2014 diff machinery + per-toolset restart capability \u2014 are the
primitives that flow needs and are independently useful.
Assisted-By: docker-agent
