fix: MCPCをvendored fork化しMCP準拠と接続安定性を改善

- Git submoduleを廃止してMCPCを直接管理
- Windowsで254リクエスト付近に発生する切断を修正
- JSON-RPC 2.0エラー応答を標準化
- tool schemaとruntimeの必須・任意引数を一致
- 1000回連続呼び出しの回帰テストを追加

1 files changed, 12 insertions, 9 deletions

diff --git a/src/mcp/tools/search_messages.c b/src/mcp/tools/search_messages.c
index 166c167..d20d7b2 100644
--- a/src/mcp/tools/search_messages.c
+++ b/src/mcp/tools/search_messages.c
@@ -45,14 +45,15 @@ call_search_messages(const mcpc_tool_t *tool, mcpc_ucbr_t *result)
   tiny_mcp_tools_context_t *context = tiny_mcp_tools_context_current();
   char *query = tiny_mcp_tool_get_string(tool, "query", TINY_QUERY_MAX);
   char *session = tiny_mcp_tool_get_string(tool, "session_id", TINY_SESSION_ID_MAX);
-  int32_t requested_limit = 0;
+  int32_t requested_limit = 20;
+  mcpc_errcode_t limit_status
+      = mcpc_tool_get_tpropval_i32(tool, (const char8_t *)"limit", &requested_limit);
   size_t limit, index, count = 0, candidate_count = 0, *candidates = NULL;
   result_item_t *items = NULL;
   tiny_json_buffer_t json;
-  bool valid
-      = context && query && query[0] && session
-        && mcpc_tool_get_tpropval_i32(tool, (const char8_t *)"limit", &requested_limit) == MCPC_EC_0
-        && requested_limit >= 1 && requested_limit <= 100;
+  bool valid = context && query && query[0]
+               && (limit_status == MCPC_EC_0 || limit_status == MCPC_EC_ANYDATA_NOTFOUND)
+               && requested_limit >= 1 && requested_limit <= 100;
   if (!valid)
     {
       tiny_mcp_tool_add_error(result, "VALIDATION_ERROR", "query or limit is invalid");
@@ -85,7 +86,7 @@ call_search_messages(const mcpc_tool_t *tool, mcpc_ucbr_t *result)
                       = tiny_store_entry(context->store, candidates[index]);
                   double score;
                   if (!entry || entry->deleted
-                      || (session[0] && strcmp(entry->message.session_id, session) != 0))
+                      || (session && session[0] && strcmp(entry->message.session_id, session) != 0))
                     {
                       continue;
                     }
@@ -127,8 +128,10 @@ bool
 tiny_mcp_register_search_messages(mcpc_server_t *server)
 {
   mcpc_tool_t *tool = tiny_mcp_tool_new("search_messages", "Search messages", call_search_messages);
-  return tool && tiny_mcp_tool_add_property(tool, "query", "Search text", MCPC_U8STR)
-         && tiny_mcp_tool_add_property(tool, "session_id", "Session ID; empty for all", MCPC_U8STR)
-         && tiny_mcp_tool_add_property(tool, "limit", "Result limit from 1 to 100", MCPC_I32)
+  return tool && tiny_mcp_tool_add_property(tool, "query", "Search text", MCPC_U8STR, true)
+         && tiny_mcp_tool_add_property(
+             tool, "session_id", "Optional session ID; omitted searches all", MCPC_U8STR, false)
+         && tiny_mcp_tool_add_property(
+             tool, "limit", "Optional result limit from 1 to 100; defaults to 20", MCPC_I32, false)
          && mcpc_server_add_tool(server, tool) == MCPC_EC_0;
 }