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BananaCrystal

BananaCrystal MCP Server

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engage_offer

Trade against an open offer by locking the same total amount in escrow. Provide offer ID, buyer/seller profiles, amount, and trade type to execute the trade.

Instructions

Engage (trade against) an open offer. The trader locks the same totalAmount in escrow.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
amountYesTrade amount
userIdNoTrader's external user ID. Defaults to your own user ID.
offerIdYesOffer UUID to engage
currencyYesCurrency code matching the offer (e.g. "NGN")
userNameNoTrader's display name
tradeTypeYesYour prediction: "long" (price goes up) or "short" (price goes down)
userEmailNoTrader's email for settlement notifications
buyerProfileIdYesBuyer profile ID
sellerProfileIdYesSeller profile ID
Behavior2/5

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

No annotations are provided, so the description carries full responsibility for behavioral disclosure. It mentions escrow locking ('locks the same totalAmount in escrow') but omits side effects like trade creation, offer state changes, and financial implications. The statement is vague and doesn't fully convey the operation's impact.

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

Conciseness5/5

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

The description is a single, front-loaded sentence with no filler. It states the primary action and a key behavioral trait efficiently, making it easy to scan.

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?

With 9 parameters, no annotations, and no output schema, the description is underspecified. It doesn't explain parameter roles beyond the schema, the meaning of 'same totalAmount', or the expected outcome/response, leaving significant gaps for an agent to invoke the tool correctly.

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

Parameters3/5

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

Schema description coverage is 100%, so baseline is 3. The description adds no extra parameter-level meaning; it uses 'totalAmount' without mapping to the 'amount' parameter or clarifying the relationship between buyerProfileId/sellerProfileId and userId.

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

Purpose4/5

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

The description uses a specific verb 'Engage' with a clear resource ('an open offer') and explains it as 'trade against', making the core function unambiguous. It doesn't explicitly contrast with sibling tools like create_offer or cancel_trade, but the action is distinct enough to differentiate.

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?

No explicit guidance on when to use this tool versus alternatives. The description only states what the tool does and mentions escrow locking, but does not cover prerequisites, selection criteria, or when to prefer it over related trade operations.

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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