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Draft Proposes Signed Taint Attestations for AI Agent Tool Calls to Curb Confused-Deputy Risks

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A draft IETF individual submission, draft-durga-wimse-ctx-isolation-00, proposes a Context Taint Attestation that AI agents would sign with each tool call to declare the trust level of their context window. The author argues that existing workload identity and access tokens say nothing about what an agent read before acting, leaving it open to confused-deputy attacks such as following instructions hidden in an email. Under the proposal, a server could refuse state-changing actions when the declared taint is untrusted. The draft was posted October 29, 2026, is at revision 00, and is listed on Datatracker as an individual submission despite claiming Standards Track status. Its example object contains placeholder hash values, and several fields are not yet tied to any enforcement rule.

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