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Glama
KirillSerchenko

products-mcp-server

Update Product

updateProduct

Update product details by providing its ID and new values for title, price, description, category, or image.

Instructions

Updates a product by id. Note: fakestoreapi.com simulates writes and does not persist them.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYes
imageNo
priceNo
titleNo
categoryNo
descriptionNo
Behavior3/5

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

Without annotations, the description carries full burden. It discloses that writes are simulated and not persisted, which is important. However, it omits other behavioral traits like required permissions, rate limits, or side effects beyond non-persistence.

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 concise with two sentences. The first sentence states the purpose, and the second adds a critical note. It is front-loaded and avoids waste, but could include parameter information without becoming verbose.

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?

Given no output schema, no annotations, and 6 undocumented parameters, the description is incomplete. It does not explain return values, error handling, required parameters beyond id, or parameter usage. The simulation note is helpful but insufficient.

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?

Schema description coverage is 0%, meaning no parameter details are provided in the description. Despite having 6 parameters, the description adds no meaning beyond the schema field names and types.

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 clearly states 'Updates a product by id', specifying the action and resource. While it doesn't explicitly differentiate from siblings, the sibling set consists mostly of getter tools, so the purpose is distinct enough.

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. The description lacks any context about prerequisites, filtering, or when to prefer other tools like createProduct or deleteProduct.

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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