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orancummins

Open Finance US MCP

by orancummins

get_account_transactions

Retrieve transactions for a single account within a date range specified in epoch seconds.

Instructions

Get transactions for a single account. Dates are epoch seconds.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNo
startNo
to_dateYes
from_dateYes
account_idYes
customer_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
okYesTrue when the upstream HTTP status was < 400.
dataNoFinicity's native response body.
errorNoError summary when ok is False.
status_codeYesUpstream Finicity HTTP status code.
Behavior2/5

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

No annotations provided; the description only implies a read operation but does not disclose pagination, rate limits, or side effects. Minimal behavioral info.

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 very short (two sentences) and front-loaded. While it could include more, it earns its place by being succinct.

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?

Missing critical context: no mention of pagination (limit/start), required identifiers, or error handling. With zero schema descriptions, the tool definition is insufficient for correct use.

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

Parameters2/5

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

Only the date format (epoch seconds) is clarified. The remaining four parameters (customer_id, account_id, limit, start) lack any description. Schema coverage is 0%, so the description fails to compensate.

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 tool retrieves transactions for a single account, distinguishing it from siblings like get_customer_transactions. The date format hint adds specificity.

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 guidance on when to use this tool versus alternatives (e.g., get_customer_transactions, get_recurring_transactions). The agent must infer from name alone.

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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