Signet, developed by Prismer AI, provides cryptographic receipts to add transparency and accountability to AI agent operations. The tool generates signed records for every tool call and writes an append-only, tamper-evident audit trail that can be verified offline using public-key cryptography. Key elements include tool-call signing, delegation chains for authorization, and native support for the Model Context Protocol (MCP). Developers, security officers, and enterprises that require verifiable agent logs gain independent confirmation of actions without trusting the hosting platform.

Signet records every tool call so you can prove what an agent executed

The tool generates a cryptographic receipt for each tool invocation, producing an append-only audit log that resists undetected modification. Receipts capture the specific action taken by an agent, allowing downstream systems to show recorded evidence of activity. This design addresses the need to demonstrate which automated steps ran in environments where actions must be auditable for compliance or forensic review.

Receipts are verifiable offline with standard public-key primitives

Verification uses public-key cryptography, specifically Ed25519, so any party with the corresponding public key can check a receipt without contacting the signing service. That enables offline validation and reduces reliance on the signing infrastructure during audits. The append-only format and cryptographic signatures make tampering detectable, supporting independent confirmation of authenticity and integrity.

The tool requires MCP-compatible agents and integrates with existing workflows

The tool is built for the Model Context Protocol, so integration expects agent frameworks or LLM environments that expose MCP-based tool calling. It is model-agnostic and therefore can attach to different language models that follow MCP. The developer describes the implementation as lightweight, which suggests minimal runtime overhead when embedded in existing agent pipelines.

Useful for audit and delegation, though it is not an enforcement gate

The tool supports cryptographic delegation chains to represent complex authorization relationships, which helps trace who permitted which tool calls. This supports compliance workflows that need provenance records. The tool focuses on verification and auditability rather than preventing unauthorized calls, so organizations should pair it with enforcement controls if they require active blocking of undesired agent behavior.

Signet suits teams that need verifiable agent records but not active enforcement

The tool is a practical option for MCP developers and security teams who require provable, independently verifiable audit trails for agent actions. Its offline verification model and delegation support help establish trust without relying on the hosting platform. For environments that need automatic blocking of unauthorized operations, add an enforcement layer alongside the tool because its primary role is recording and proving actions rather than stopping them.