Unlock a specific holder-only item. Returns the full content inline, watermarked with your wallet address. Pass the product_id and your session token.
AI agents call unlock-content to retrieve information from Spines Underground without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and returns content gated behind ownership/payment verification. The primary action is reading/fetching holder-only content. However, it may implicitly validate a financial entitlement (paid products $1.99–$4.99), but it does not itself move money — payment is assumed to have already occurred. The watermarking is a minor write side-effect but the dominant purpose is content retrieval.
From the tool's definition 'Unlock a specific holder-only item. Returns the full content inline, watermarked with your wallet address.'
Attacks that exploit this kind of access
Unlock a specific holder-only item. Returns the full content inline, watermarked with your wallet address. Pass the product_id and your session token. It is categorised as a Read tool in the Spines Underground MCP Server, which means it retrieves data without modifying state.
Register the Spines Underground MCP server in PolicyLayer and add a rule for unlock-content: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Spines Underground. Nothing to install.
unlock-content is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the unlock-content rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for unlock-content. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
unlock-content is provided by the Spines Underground MCP server (lisamaraventano-spine/spines-underground). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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