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feat: make MCP server registrations persistent across peer disconnects
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Persistent MCP servers (opt-in via `persistent: true`) survive host
disconnects — they appear as offline in mcp_list and auto-restore when
the host reconnects. Ephemeral servers (default) still clean up on
disconnect. Offline servers return a clear error on mcp_call with
time-since-disconnect info.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Alejandro Gutiérrez
2026-04-08 00:22:06 +01:00
parent 56b1cc0756
commit 5398ca6833
5 changed files with 82 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
apps/cli/src/mcp/server.ts
View File

@@ -1144,27 +1144,32 @@ Your message mode is "${messageMode}".
// --- MCP Proxy ---
case "mesh_mcp_register": {
const { server_name, description, tools: regTools } = (args ?? {}) as {
const { server_name, description, tools: regTools, persistent: regPersistent } = (args ?? {}) as {
server_name?: string;
description?: string;
tools?: Array<{ name: string; description: string; inputSchema: Record<string, unknown> }>;
persistent?: boolean;
};
if (!server_name || !description || !regTools?.length)
return text("mesh_mcp_register: `server_name`, `description`, and `tools` required", true);
const client = allClients()[0];
if (!client) return text("mesh_mcp_register: not connected", true);
const result = await client.mcpRegister(server_name, description, regTools);
const result = await client.mcpRegister(server_name, description, regTools, regPersistent);
if (!result) return text("mesh_mcp_register: broker did not acknowledge", true);
return text(`Registered MCP server "${result.serverName}" with ${result.toolCount} tool(s). Other peers can now call its tools via mesh_tool_call.`);
const persistLabel = regPersistent ? " (persistent — survives disconnect)" : "";
return text(`Registered MCP server "${result.serverName}" with ${result.toolCount} tool(s)${persistLabel}. Other peers can now call its tools via mesh_tool_call.`);
}
case "mesh_mcp_list": {
const client = allClients()[0];
if (!client) return text("mesh_mcp_list: not connected", true);
const servers = await client.mcpList();
if (servers.length === 0) return text("No MCP servers registered in the mesh.");
const lines = servers.map((s) => {
const toolList = s.tools.map((t) => ` - **${t.name}**: ${t.description}`).join("\n");
return `- **${s.name}** (hosted by ${s.hostedBy}): ${s.description}\n${toolList}`;
const lines = servers.map((s: any) => {
const toolList = s.tools.map((t: any) => ` - **${t.name}**: ${t.description}`).join("\n");
const status = s.online === false
? ` [OFFLINE${s.offlineSince ? ` since ${s.offlineSince}` : ""}]`
: "";
return `- **${s.name}** (hosted by ${s.hostedBy})${status}: ${s.description}\n${toolList}`;
});
return text(`${servers.length} MCP server(s) in mesh:\n${lines.join("\n")}`);
}
@@ -1383,6 +1388,8 @@ Your message mode is "${messageMode}".
content = `[system] New MCP server available: "${data.serverName}" (hosted by ${data.hostedBy}). Tools: ${tools}. Use mesh_tool_call to invoke.`;
} else if (eventName === "mcp_unregistered") {
content = `[system] MCP server "${data.serverName}" removed (was hosted by ${data.hostedBy})`;
} else if (eventName === "mcp_restored") {
content = `[system] MCP server "${data.serverName}" is back online (hosted by ${data.hostedBy})`;
} else {
content = `[system] ${eventName}: ${JSON.stringify(data)}`;
}