{"record":{"id":"614a3cf67cf37402","repo":"openai/codex","slug":"mcp-server-server-is-not-connected","errorCode":null,"errorMessage":"MCP server '{server}' is not connected","messagePattern":"MCP server '(.+?)' is not connected","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"codex-rs/codex-mcp/src/connection_manager.rs","lineNumber":905,"sourceCode":"                view.metadata.environment_id\n            );\n        }\n        if !view.tool_filter.allows(tool) {\n            return Err(anyhow!(\n                \"tool '{tool}' is disabled for MCP server '{server}'\"\n            ));\n        }\n        let client = if wait_for_server {\n            view.connection\n                .client()\n                .await\n                .context(\"failed to get client\")?\n        } else {\n            let client = view\n                .connection\n                .client\n                .ready_client()\n                .ok_or_else(|| anyhow!(\"MCP server '{server}' is not connected\"))?;\n            if client.client.is_closed().await {\n                bail!(\"MCP server '{server}' is not connected\");\n            }\n            client\n        };\n\n        let effective_timeout = match (view.tool_timeout, requested_timeout) {\n            (Some(server_timeout), Some(requested_timeout)) => {\n                Some(server_timeout.min(requested_timeout))\n            }\n            (server_timeout, requested_timeout) => server_timeout.or(requested_timeout),\n        };\n        let result: rmcp::model::CallToolResult = client\n            .client\n            .call_tool(tool.to_string(), arguments, meta, effective_timeout)\n            .await\n            .with_context(|| format!(\"tool call failed for `{server}/{tool}`\"))?;\n","sourceCodeStart":887,"sourceCodeEnd":923,"githubUrl":"https://github.com/openai/codex/blob/339751715c64496cb86246bfb3935f40e309dd3d/codex-rs/codex-mcp/src/connection_manager.rs#L887-L923","documentation":"Error \"MCP server '{server}' is not connected\" thrown in openai/codex.","triggerScenarios":"Thrown at codex-rs/codex-mcp/src/connection_manager.rs:905 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Check that MCP server '{server}' is configured and its startup succeeded; inspect its startup logs and retry the connection."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"339751715c64496cb86246bfb3935f40e309dd3d","analyzedAt":"2026-08-25T05:35:09.876Z","schemaVersion":2},"datasetVersion":"2026-08-25T06:17:31.827Z"}