list_documents
List documents from a Firestore database.
This record as markdown: /tools/com-googleapis-firestore-mcp/list-documents.md
What list_documents does on Mcp
AI agents call list_documents to retrieve information from Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
mask | object | — | Optional. The fields to return. If not set, returns all fields. If a document has a field that is not present in this mask, that field will not be returned in t |
parent | string | Yes | Required. The parent resource name. In the format: `projects/{project_id}/databases/{database_id}/documents` or `projects/{project_id}/databases/{database_id}/d |
orderBy | string | — | Optional. The optional ordering of the documents to return. For example: `priority desc, __name__ desc`. This mirrors the `ORDER BY` used in Firestore queries b |
pageSize | integer | — | Optional. The maximum number of documents to return in a single response. Firestore may return fewer than this value. |
readTime | string | — | Perform the read at the provided time. This must be a microsecond precision timestamp within the past one hour, or if Point-in-Time Recovery is enabled, can add |
pageToken | string | — | Optional. A page token, received from a previous `ListDocuments` response. Provide this to retrieve the subsequent page. When paginating, all other parameters ( |
recursive | boolean | — | Optional. If the list should recursively include all documents nested under the parent at any level. If the request specifies a `collection_id`, then the list w |
showMissing | boolean | — | If the list should show missing documents. A document is missing if it does not exist, but there are sub-documents nested underneath it. When true, such missing |
transaction | string | — | Perform the read as part of an already active transaction. |
collectionId | string | — | Optional. The collection ID, relative to `parent`, to list. For example: `chatrooms` or `messages`. This is optional, and when not provided, Firestore will list |
requestOptions | object | — | Optional. The request options for this request. |
Parameters from the server's own tool schema.
Why list_documents is rated Low
Even though list_documents only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Risk signalsHigh parameter count (11 properties)
Attacks that exploit this kind of access
The rule that runs list_documents safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_documents, this is the rule to start with:
list_documents is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Mcp, apply this rule, and every list_documents call is checked against it from then on.
Questions about list_documents
List documents from a Firestore database. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
list_documents accepts 11 parameters: mask, parent, orderBy, pageSize, readTime, pageToken, recursive, showMissing, transaction, collectionId, requestOptions. Required: parent. The full parameter table on this page comes from the server's own tool schema.
Register the MCP server in PolicyLayer and add a rule for list_documents: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp. Nothing to install.
list_documents is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_documents rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for list_documents. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
list_documents is provided by the MCP server (https://firestore.googleapis.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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