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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"MCP tool results should set `is_error: true` when validation fails","articleBody":"### Describe the bug\n\nWhen a tool fails due to validation (ex: missing required parameter owner), the response should indicate an error and set `is_error: true` or the proper error structure. Currently, is_error gets set to false with error text in content. This means that downstream clients are not able to treat this as a failure, so in my case my Dapr Agent is not able to properly handle this failure.\n\n\nadditional context: https://github.com/dapr/dapr-agents/pull/423\n\n### Affected version\n\nRemote MCP server endpoint: https://api.githubcopilot.com/mcp/.\n\n### Steps to reproduce the behavior\n\nYou can reproduce the issue by running my release note agent:\nhttps://github.com/sicoyle/release-note-agent\n\n### Expected vs actual behavior\n\nI should be able to parse the error field appropriately in Dapr Agents repo.\n\n### Logs\n\n```\nlResult'\u003e)\nGithubGetReleaseByTag(tool) (Id: call_eECqd2eObRNweLdG2AHHfMTZ):\n{\"meta\": null, \"content\": [{\"type\": \"text\", \"text\": \"missing required parameter: owner\", \"annotations\": null, \"meta\": null}], \"structured_content\": null, \"is_error\": false}\n\n-----------------------------------------------\n```\n","author":{"url":"https://github.com/sicoyle","@type":"Person","name":"sicoyle"},"datePublished":"2026-02-03T20:56:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/1952/github-mcp-server/issues/1952"}