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CMSCardOS

CardOS MCP Server

Official
by CMSCardOS

unfreeze_card

Unfreeze a frozen card to restore its ability to make transactions. Provide the card ID to complete the action.

Instructions

Unfreeze a frozen card. Idempotent.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
card_idYesCard id returned by issue_card.
Behavior2/5

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

With no annotations, the description carries the full behavioral burden. It only mentions idempotency, but doesn't disclose error handling, prerequisites, or effects on related states.

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?

Two short sentences with no unnecessary words. Efficient and front-loaded.

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

Completeness3/5

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

For a simple single-parameter tool, the description is adequate but missing details like behavior on invalid card_id or errors. Good but not fully complete.

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 coverage is 100%. The parameter description 'Card id returned by issue_card' adds context beyond the schema, but lacks format or examples. Baseline 3 applies.

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 'Unfreeze a frozen card' which is a specific verb and resource. It distinguishes from sibling tools like freeze_card and close_card.

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

Usage Guidelines3/5

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

The description implies usage when a card is frozen and needs to be unfrozen, but provides no explicit guidance on when to use versus alternatives, nor any exclusions.

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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