[FLINK-AGENTS] Fix Java agents failing to connect to MCP servers without prompt support (#538)#539
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avichaym wants to merge 1 commit intoapache:mainfrom
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[FLINK-AGENTS] Fix Java agents failing to connect to MCP servers without prompt support (#538)#539avichaym wants to merge 1 commit intoapache:mainfrom
avichaym wants to merge 1 commit intoapache:mainfrom
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…upport PR apache#447 fixed the Python MCP path but not the Java path. AgentPlan.extractJavaMCPServer calls listPrompts() unconditionally, which fails with 'Method not found' for MCP servers that only support tools (e.g. AgentCore Gateway). - Add MCPServer.supportsPrompts() checking ServerCapabilities.prompts() - Guard listPrompts call in extractJavaMCPServer with supportsPrompts check
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Linked issue: #538
What is the purpose of the change
Fix Java agents failing with
McpError: Method not foundwhen connecting to MCP servers that don't support prompts (e.g., AgentCore Gateway). PR #447 fixed the Python path (#412) but the Java path inAgentPlan.extractJavaMCPServerwas not addressed.Brief change log
MCPServer.supportsPrompts()— checksMcpSyncClient.getServerCapabilities().prompts() != nulllistPromptscall inAgentPlan.extractJavaMCPServerwithsupportsPrompts()via reflectionsupportsPromptsmethod exists and is reflection-callableDoes this pull request potentially affect one of the following parts
How was this patch tested?
MCPServerTest.testSupportsPromptsMethodExistscapabilities.prompts=null). Agent plan creation succeeds, tools are discovered, Flink job completes successfully.Documentation
doc-not-needed