First commit of Phase 2 per docs/PHASE2.md §12. Three changes bundled:
mcp.lua (new, 153 lines):
- M.connect(url, opts) returns a Session.
- Session:initialize() round-trips initialize + notifications/initialized
+ tools/list. Caches tools for session lifetime (lmcp announces
capabilities.tools.listChanged = false; no refetch).
- Session:list_tools() returns the cached tool list.
- Session:call_tool(name, args) returns (result_table, kind) where
kind ∈ {"ok", "handler_error", "rpc_error", "transport_error"} per
the §4 error split. Folded HTTP-level failure into transport_error.
- Per-server Bearer auth via opts.auth_token or opts.auth_env env-var
indirection.
- Captures protocolVersion mismatch as a warning string rather than
aborting (lmcp doesn't negotiate — N3 in review).
ffi/curl.lua extension:
- Add curl_easy_getinfo to ffi.cdef.
- Pre-cast as getinfo_long; helper get_response_code() fetches
CURLINFO_RESPONSE_CODE (decimal 2097154 = CURLINFOTYPE_LONG | 2).
- M.post now returns (body, status_code) on transport success;
(nil, errmsg) on libcurl failure stays unchanged. Phase 1 callers
reading only the first slot are unaffected.
docs/PHASE0.md §4:
- Insert `mcp.lua` between broker.lua and router.lua per PHASE2.md §9.
- Module-stability invariant clarified: rename prohibition is what
matters; adding new files is additive.
Smoke-test passes for all four kinds against boltzmann lmcp v0.5.4:
- initialize: ok (7 tools cached)
- list_dir /tmp: ok (1.2KB content)
- read_file /nonexistent: ok (boltzmann's baseline §3 quirk —
isError:false even on failure; content is authoritative)
- nope_tool: rpc_error (code=-32601)
- wrong auth: transport_error (HTTP 401)
- unreachable host: transport_error (DNS failure)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
marfrit
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