23 tools. 13 can modify or destroy data without limits.
4 destructive tools with no built-in limits. Policy required.
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Destructive tools (firestore-array-remove, firestore-delete-document, firestore-delete-document-by-path) permanently delete resources. There is no undo. An agent calling these in a retry loop causes irreversible damage.
Write operations (firestore-array-union, firestore-batch-write, firestore-create-document) modify state. Without rate limits, an agent can make hundreds of changes in seconds — faster than any human can review or revert.
Execute tools (firestore-field-value-batch, firestore-transaction) trigger processes with side effects. Builds, notifications, workflows — all fired without throttling.
Intercept sits between your agent and Firestore Server. Every tool call checked against your policy before it executes — so your agent can do its job without breaking things.
npx -y @policylayer/intercept scan -- npx -y @devlimelabs/firestore-mcp firestore-array-remove:
rules:
- action: deny Destructive tools should never be available to autonomous agents without human approval.
firestore-array-union:
rules:
- rate_limit: 30/hour Prevents bulk unintended modifications from agents caught in loops.
firestore-batch-read:
rules:
- rate_limit: 60/minute Controls API costs and prevents retry loops from exhausting upstream rate limits.
Yes. The Firestore Server server exposes 4 destructive tools including firestore-array-remove, firestore-delete-document, firestore-delete-document-by-path. These permanently remove resources with no undo. Intercept blocks destructive tools by default so they never reach the upstream server.
The Firestore Server server has 7 write tools including firestore-array-union, firestore-batch-write, firestore-create-document. Set rate limits in your policy file -- for example, rate_limit: 10/hour prevents an agent from making more than 10 modifications per hour. Intercept enforces this at the transport layer.
23 tools across 4 categories: Destructive, Execute, Read, Write. 10 are read-only. 13 can modify, create, or delete data.
One line change. Instead of running the Firestore Server server directly, prefix it with Intercept: intercept -c devlimelabs-firestore-mcp.yaml -- npx -y @devlimelabs/firestore-mcp. Download a pre-built policy from policylayer.com/policies/devlimelabs-firestore-mcp and adjust the limits to match your use case.
Starter policies available for each. Same risk classification, same one-command setup.
Set budgets, approvals, and hard limits across MCP servers.
npx -y @policylayer/intercept init