{"record":{"id":"45f8cd97c7c37247","repo":"ruvnet/ruflo","slug":"a2a-agent-card-endpoint-unavailable-err-instanc","errorCode":null,"errorMessage":"A2A agent card endpoint unavailable (${err instanceof Error ? err.message : err}); federation continues without the A2A discovery surface","messagePattern":"A2A agent card endpoint unavailable \\((.+?)\\); federation continues without the A2A discovery surface","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"v3/@claude-flow/plugin-agent-federation/src/plugin.ts","lineNumber":526,"sourceCode":"                  'websocket',\n                  'http',\n                  ...(signatureMode === 'legacy' ? [] : [JCS_SIGNATURE_PROTOCOL]),\n                ],\n                complianceModes: complianceMode === 'none' ? [] : [complianceMode],\n              },\n              version: this.version,\n              signature: '',\n              timestamp: new Date().toISOString(),\n            };\n            return toAgentCard(manifest);\n          },\n          port: a2aPort,\n          host: (config['a2aCardHost'] as string | undefined) ?? '127.0.0.1',\n          allowNonLoopback: config['a2aCardAllowNonLoopback'] === true,\n        });\n        context.logger.info(`A2A agent card served at ${this.agentCardServer.url}`);\n      } catch (err) {\n        context.logger.warn(\n          `A2A agent card endpoint unavailable (${err instanceof Error ? err.message : err}); ` +\n            'federation continues without the A2A discovery surface',\n        );\n        this.agentCardServer = null;\n      }\n    }\n\n    context.logger.info('Agent Federation plugin initialized');\n  }\n\n  async shutdown(): Promise<void> {\n    if (this.agentCardServer) {\n      try {\n        await this.agentCardServer.close();\n      } catch (err) {\n        this.context?.logger.warn(\n          `A2A agent card server close error: ${err instanceof Error ? err.message : err}`,\n        );","sourceCodeStart":508,"sourceCodeEnd":544,"githubUrl":"https://github.com/ruvnet/ruflo/blob/fa13ee4ad60ac2090b1480656eb233521790d640/v3/@claude-flow/plugin-agent-federation/src/plugin.ts#L508-L544","documentation":"Log warning in initialize: starting the A2A well-known agent-card HTTP server failed (port busy or bind error); federation continues to function but without the HTTP discovery surface advertising its card.","triggerScenarios":"Thrown at v3/@claude-flow/plugin-agent-federation/src/plugin.ts:526 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Check why the A2A agent card endpoint failed to bind (port in use, permissions); federation works without it but A2A discovery is unavailable."],"exampleFix":null,"handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"fa13ee4ad60ac2090b1480656eb233521790d640","analyzedAt":"2026-08-18T21:34:22.708Z","contentChangedAt":"2026-08-18T21:34:22.708Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}