Kuberwastaken/claurst · error

rmcp list_all_tools failed

Error message

rmcp list_all_tools failed: {}

What it means

During connection setup, build_snapshot's paginated list_all_tools call failed even though the server advertised the tools capability. The initialize handshake succeeded, but enumerating tools errored (server-side failure or connection drop), so no snapshot can be built.

Solutions

1. Retry connecting; transient server errors during listing are common
2. Check server logs for why tools/list failed
3. Verify protocol compatibility with the server

When it happens

Trigger: Thrown at src-rust/crates/mcp/src/rmcp_backend.rs:640 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Kuberwastaken/claurst@b0637c97ec (2026-09-10). Data as JSON: /api/errors/0ed9633d5fe43d85. Report an issue: GitHub.

Appendix: source

Thrown at src-rust/crates/mcp/src/rmcp_backend.rs:640

) -> anyhow::Result<McpClientSnapshot> {
    let server_info = peer.peer_info().map(|info| (*info).clone());

    let (server_info_value, capabilities, instructions) = match server_info {
        Some(info) => (
            Some(ServerInfo {
                name: info.server_info.name,
                version: info.server_info.version,
            }),
            convert_server_capabilities(info.capabilities),
            info.instructions,
        ),
        None => (None, ServerCapabilities::default(), None),
    };

    let tools = if capabilities.tools.is_some() {
        peer.list_all_tools()
            .await
            .map_err(|e| anyhow::anyhow!("rmcp list_all_tools failed: {}", e))?
            .into_iter()
            .map(convert_tool)
            .collect()
    } else {
        vec![]
    };

    let resources = if capabilities.resources.is_some() {
        peer.list_all_resources()
            .await
            .map_err(|e| anyhow::anyhow!("rmcp list_all_resources failed: {}", e))?
            .into_iter()
            .map(convert_resource)
            .collect()
    } else {
        vec![]
    };

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