Unverified50% confidenceDecision RuleExact time
MCP Events requires signature verification of callback requests: developers compute a signature over the raw request body using a secret key and compare it with the signature in the request header, and must reject the request outright if verification fails.
1
Sources
50%
Confidence
Long-term
Relevance
10/18/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedIn the MCP authorization flow, when rejecting a request, the server explicitly informs the client of the specific permission scope (Scope) that needs to be applied for.74% similarVerifiedThe MCP authorization specification emphasizes token audience validation, requiring MCP servers to verify that a token was indeed issued to themselves in order to prevent confused deputy attacks.73% similarUnverifiedMCP annotations are only requests to the client rather than guarantees, and actual behavior still needs to be clearly stated in server instructions.69% similarVerifiedMCP defines a standard response mechanism for errors occurring during tool calls.68% similarUnverifiedWhen evaluating an MCP integration, one must confirm that permission checks occur on the server side in the context of each retrieval request, rather than relying solely on identity verification at connection initialization.68% similar
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