The mcplocal counterpart to mcpd's VirtualLlmService. After this stage,
flipping \`publish: true\` on a provider in ~/.mcpctl/config.json makes
the provider show up in mcpctl get llm with kind=virtual the next time
mcplocal restarts; running an inference against it relays through this
client back to the local LlmProvider.
Config:
- LlmProviderFileEntry gains optional \`publish: boolean\` (default false,
so existing setups don't change).
Registrar (new file: providers/registrar.ts):
- start(): if any provider is opted-in, POSTs to
/api/v1/llms/_provider-register with the publishable set, persists
the returned providerSessionId to ~/.mcpctl/provider-session for
sticky reconnects, then opens the SSE control channel and starts a
30-s heartbeat ticker.
- SSE listener parses event/data lines from text/event-stream frames.
task frames trigger handleInferTask: convert OpenAI body to
CompletionOptions, call provider.complete(), POST the result back as
either { status, body } (non-streaming) or two chunk POSTs
(streaming: one delta + a [DONE] marker).
- Disconnect → exponential backoff reconnect from 5 s up to 60 s. On
successful reconnect the persisted sessionId revives the same Llm
rows in mcpd (mcpd flips them back to active on heartbeat).
- stop() destroys the SSE socket and clears the timer; cleanly handed
off from main.ts's existing shutdown handler.
Wired into mcplocal main.ts via maybeStartVirtualLlmRegistrar:
- Filters opted-in providers, looks up their LlmProvider instances in
the registry.
- Reads ~/.mcpctl/credentials for mcpdUrl + bearer; absence is a
best-effort skip (logs a warning, returns null) — never a boot
blocker.
v1 caveat documented in the file header: LlmProvider returns a
finalized CompletionResult, not a token stream, so streaming requests
get a single delta chunk + [DONE]. Real per-token streaming is a v2
concern.
Tests: 5 new in tests/registrar.test.ts using a tiny in-process HTTP
server. Cover: no-op when nothing opted-in, register POST + sticky
sessionId persistence, sticky reconnect from disk, heartbeat ticker
fires at the configured interval, register HTTP error surfaces.
Workspace suite: 2043/2043 across 152 files (was 2006/149, +5
new tests + the new file gets discovered).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
