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devlimelabs

Firestore MCP Server

by devlimelabs

firestore-array-remove

Remove specific elements from array fields in Firestore documents to maintain accurate data structures and prevent outdated information.

Instructions

Remove elements from an array field

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
documentPathYesFull path to the document
fieldYesArray field name
elementsYesElements to remove from the array
Behavior2/5

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

With no annotations, the description carries the full burden of behavioral disclosure. It states the action (remove) but doesn't mention permissions needed, whether the operation is atomic, error handling (e.g., if elements aren't present), or side effects. This leaves significant gaps for a mutation tool.

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, efficient sentence with no wasted words, making it easy to parse. It's appropriately sized for the tool's complexity, though it could benefit from more detail given the lack of annotations.

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?

For a mutation tool with no annotations and no output schema, the description is incomplete. It doesn't explain return values, error conditions, or behavioral nuances, leaving the agent with insufficient context to use the tool effectively.

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 the schema fully documents parameters like 'documentPath' and 'elements'. The description adds no additional meaning beyond the schema, such as format examples or constraints, meeting the baseline for high coverage.

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 'Remove elements from an array field' clearly states the action (remove) and target (array field), making the purpose understandable. However, it doesn't distinguish this tool from its sibling 'firestore-array-union' (which adds elements) or other array-modifying tools, missing explicit differentiation.

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 is provided on when to use this tool versus alternatives like 'firestore-update-document' or 'firestore-array-union'. The description lacks context about prerequisites (e.g., the array must exist) or exclusions, offering minimal usage direction.

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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