Sell outcome shares back to an ACTIVE market. If num_shares is omitted, the tool reads the on-chain position and sells everything for that outcome. Requires an active wallet (call set_wallet first). Amounts in responses are micro-USDC (1 USDC = 1,000,000).
AI agents use sell_shares to commit financial operations through Question Market — usually the final step of a payment, billing, or trading workflow. A call moves real money.
Selling shares on a prediction market directly moves financial assets (USDC) and constitutes a financial transaction. Misuse could result in unintended liquidation of positions or financial loss, warranting critical severity given it operates on real funds with no mention of reversibility.
From the tool's definition 'Sell outcome shares back to an ACTIVE market' and 'trading through natural language' — this tool executes a financial transaction on a prediction market, exchanging shares for USDC on the Algorand blockchain.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
Sell outcome shares back to an ACTIVE market. If num_shares is omitted, the tool reads the on-chain position and sells everything for that outcome. Requires an active wallet (call set_wallet first). Amounts in responses are micro-USDC (1 USDC = 1,000,000). It is categorised as a Financial tool in the Question Market MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Question Market MCP server in PolicyLayer and add a rule for sell_shares: 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 Question Market. Nothing to install.
sell_shares is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the sell_shares 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 sell_shares. 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.
sell_shares is provided by the Question Market MCP server (qmrkt/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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