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1. Kehrlann

   added this to 2025-11-25 Implementationon Nov 26, 2025
2. Kehrlann

   added the

   Enhancement

   issue type on Nov 26, 2025
3. Kehrlann

   moved this to Backlog in 2025-11-25 Implementationon Nov 26, 2025
4. chemicL

   added

   enhancementNew feature or requestNew feature or request

   P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

   on Feb 20, 2026
5. ashakirin commented on Mar 8, 2026

   

   ashakirin

   on Mar 8, 2026

   Contributor

   More actions

   started working on the enhancement (close to #689)
6. ashakirin commented on Mar 17, 2026

   

   ashakirin

   on Mar 17, 2026

   Contributor

   More actions

   I'd like to add some additional context: currently, the Java SDK validates tool output parameters, against the outputSchema, but does not validate tool input parameters against the inputSchema by default. According to the MCP specification, servers MUST validate all tool inputs.

   As part of this issue, we plan to:

   1. Implement input schema validation for tool arguments
   2. Enable this validation by default to align with the specification requirements

   Please note: This change may not be backward compatible with existing implementations. Some tools that currently work may fail validation if their input schemas are not correctly defined. However, this change is necessary to ensure compliance with the MCP specification.

   Reacted by Daniel Garnier-Moiroux and sAInath
7. ashakirin

   added a commit that references this issue on Mar 18, 2026

   feat!: modelcontextprotocol#697 added tool input arguments validation…

   18c626b
8. ashakirin

   added 8 commits that reference this issue on Apr 3, 2026

   chore: modelcontextprotocol#697 fixed author name

   1cabd8f

   feat: modelcontextprotocol#697 removed system property option to chan…

   ec41a40

   feat: modelcontextprotocol#697 adapted to Map<String, Object> input s…

   73daf65

   feat!: modelcontextprotocol#697 added tool input arguments validation…

   d092d46

   chore: modelcontextprotocol#697 fixed author name

   3b63b8e

   feat: modelcontextprotocol#697 removed system property option to chan…

   7cde04b

   feat: modelcontextprotocol#697 adapted to Map<String, Object> input s…

   c094c06

   chore: modelcontextprotocol#697 restored original imports

   b9d8ff3
9. Kehrlann

   closed this as completedin d182338on Apr 13, 2026
10. github-project-automation

    moved this from Backlog to Done in 2025-11-25 Implementationon Apr 13, 2026
11. pull

    added a commit that references this issue on Apr 13, 2026

    feat!: add tool input arguments validation (modelcontextprotocol#873)

    This issue will close once commit d182338 is merged into the 'main' branch.

    d182338