René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"feat: Add support for meta parameter to list tools call( paginated request already support meta field).","articleBody":"\n\n**Expected Behavior**\n\n\n`McpSyncClient` and `McpAsyncClient` should provide support for passing meta parameter or to expose overloaded paginated list methods that accept a meta parameter, consistent with the Python SDK:\n\njava\n`client.listTools(String cursor, Map\u003cString, Object\u003e meta)`\n\n**Current Behavior**\n\nMcpSchema.PaginatedRequest now has a meta field (added in #344), but listTools \nonly accepts a cursor string with no way to pass _meta. Due to this, the meta field though supported in request cannot be passed via client for listTools call. Note: The Python SDK already supports this: `list_tools(cursor=None, meta=None)`. \n\n**Context**\n\n- **How has this issue affected you?** When building an MCP server that needs \nto pass authentication data via `_meta` in tools/list requests, Java clients have\nno way to include this metadata even though the schema supports it.\n\n- **What are you trying to accomplish?** Pass request-scoped metadata in tools/list calls from Java MCP clients, \nconsistent with what the Python SDK already supports.\n\n- **What other alternatives have you considered?** Using a lower-level transport layer to manually construct the JSON-RPC request, but this bypasses the SDK's client abstraction entirely.\n\n- **Are you aware of any workarounds?** No clean workaround exists within the SDK API. The only option is to bypass McpSyncClient/McpAsyncClient and send raw JSON-RPC messages directly.\n\nA PR with the implementation is available:[PR #906](https://github.com/modelcontextprotocol/java-sdk/pull/906)\n","author":{"url":"https://github.com/smohite04","@type":"Person","name":"smohite04"},"datePublished":"2026-04-07T16:02:30.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/907/java-sdk/issues/907"}