Skip to main content
Glama
matthewdtowles

iwantmymtg-mcp

update_inventory

Adjust inventory quantities for existing Magic: The Gathering card rows, supporting batch updates for foil and non-foil variants.

Instructions

Update quantities for one or more existing inventory rows. Accepts a batch. Use remove_inventory to delete a row entirely. Requires IWMM_API_KEY.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
itemsYes
Behavior2/5

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

No annotations exist, so description must fully disclose behavior. It confirms mutation but lacks details on idempotency, rate limits, side effects, or authorization beyond the key.

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?

Three short sentences, front-loaded with purpose, immediately followed by alternative and requirement. No redundant text.

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?

No output schema, no error handling, no mention of idempotency. However, the tool is straightforward and the description covers core usage. Adequate but with gaps.

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?

Description adds no information about parameters; schema descriptions are present but tool description does not supplement or clarify them. Batch capability is implied but not elaborated.

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?

Clearly states verb 'Update' and resource 'existing inventory rows', mentions batch capability. Distinguishes from 'remove_inventory' for deletion. Specific and actionable.

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

Usage Guidelines4/5

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

Explicitly directs to use 'remove_inventory' for deletion, and notes requirement of 'IWMM_API_KEY'. Provides clear context, though no further alternative guidance.

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

Install Server

Other Tools

Latest Blog Posts

MCP directory API

We provide all the information about MCP servers via our MCP API.

curl -X GET 'https://glama.ai/api/mcp/v1/servers/matthewdtowles/iwantmymtg-mcp'

If you have feedback or need assistance with the MCP directory API, please join our Discord server