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Firebase Emulator MCP Server

Firebase Emulator MCP Server

by LaishGlenberg
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

firestore_get

Retrieve a single Firestore document by path from the Firebase emulator to inspect local data during development.

Instructions

Get a single Firestore document by path (e.g. Member/abc123)

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "path": "<path>"
    },
    "name": "firestore_get"
  }
}

Input Schema

NameRequiredDescriptionDefault
pathYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.3

TDQS

A4.1/5.0
Behavior3/5

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

No annotations are provided, so the description carries the full burden. It discloses a read operation ('Get') but does not specify behavior when the document is not found, whether any authentication is needed, or what the return value looks like. The path example adds some context, but significant behavioral details are missing.

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, clear sentence that is front-loaded with the core purpose and includes an example. Every word earns its place, with no redundancy or unnecessary detail.

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?

Given the tool's simplicity (one parameter, no output schema), the description is mostly adequate. However, it lacks any mention of return values or error behavior when the document doesn't exist. Since no output schema exists, the description should have provided a bit more context about what happens on success or failure.

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

Parameters4/5

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

The schema has one parameter 'path' with no description, and description coverage is 0%. The description compensates by explaining that path is the document path and provides a concrete example ('Member/abc123'), adding meaning beyond the bare schema.

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 gets a single Firestore document by path, using a specific verb ('Get') and resource ('Firestore document'). It also gives a path example, which distinguishes it from sibling tools like firestore_list_collections (list) and firestore_query (query multiple), and rtdb_get (different database).

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?

The description provides clear context for when to use the tool: when you need a single document and know its path. The example 'Member/abc123' clarifies the expected path format. However, it does not explicitly mention alternatives or when not to use it, but the context is sufficient for a simple tool.

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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