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unsanction

Polymarket MCP Server

by unsanction

polymarket_cancel_order

Cancel an open order on Polymarket by providing its order ID. Use this to retract or adjust your trading positions in prediction markets.

Instructions

Cancel an existing order on Polymarket.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
order_idYes
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description must disclose behavior, but it only states the cancel action without detailing consequences such as order state changes, whether partial fills affect ability to cancel, or any required authorization. This leaves significant behavioral information undisclosed.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single clear sentence that is appropriately concise and front-loaded. It avoids verbosity but is under-specified in terms of usage and parameter details, though that is covered elsewhere.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple cancellation tool with one parameter and no output schema, the description is minimal. It lacks information about how order_id should be formatted, how to obtain it, and what response to expect, so it is not fully contextual.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has one parameter (order_id) with no description, and the tool description does not mention order_id at all. With 0% schema description coverage, the description fails to add meaning about how to identify the order or acquire its ID.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action (cancel) and the target (an existing order on Polymarket). It differentiates from sibling tools like place_order and get_trades through the cancel verb.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives, nor does it mention any prerequisites or edge cases. Users must infer from the name that it is for canceling orders.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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