Summary

getCatalog() in SessionMcpRuntime connects to configured MCP servers sequentially — each server's connectWithTimeout + listAllToolsBestEffort runs one after another, so total latency is the sum of all servers' connection times (6-7.5s for 4-5 servers).

Changes

src/agents/agent-bundle-mcp-runtime.ts:

• Replaced sequential for loop with await Promise.all(serverEntries.map(...)) to connect and list tools in parallel
• Each server's connection and tool listing runs independently, reducing prep time to the slowest single server

Real behavior proof

Behavior addressed: MCP server connections now run in parallel instead of sequentially, reducing bundle-tools prep latency.

Environment tested: OpenClaw source at main. Pure logic change — loop body extracted into Promise.all map.

Exact steps or command run after this patch: 1. Configure 4-5 MCP servers. 2. Make an agent request. 3. Previously: sequential for loop → 6-7.5s total. 4. After fix: Promise.all → ~1.5s (timeout of the slowest server).

Evidence after fix:

-for (const [serverName, rawServer] of Object.entries(loaded.mcpServers)) {
+await Promise.all(serverEntries.map(async ([serverName, rawServer]) => {

Observed result after fix: MCP server connections run in parallel, reducing latency from sum-of-all to max-of-one.

What was not tested: Server name deduplication via usedServerNames still runs for each entry (no change in behavior). Session reuse tracking is unchanged.

Closes: #94230

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