This record as markdown: /tools/io-github-kivanccakmak-yaver/db-restore.md
What db_restore does on Yaver
AI agents call db_restore to permanently remove resources in Yaver, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
| Parameter | Type | Required | Description |
|---|---|---|---|
db_url | string | — | Target database URL |
backup_path | string | Yes |
Parameters from the server's own tool schema.
Why db_restore is rated Critical
A database restore is a destructive, irreversible operation: it replaces the entire current database with the backup contents, permanently losing any data that existed between the backup point and the restore operation. This is a critical-severity action because an AI agent misusing it could wipe an entire production database's recent state with no recovery path.
From the tool's definition 'Restore database from a backup file' — restoring a database overwrites the current database state entirely, irreversibly destroying all data written since the backup was taken.
Attacks that exploit this kind of access
The rule that runs db_restore safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Yaver, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For db_restore, this is the rule to start with:
db_restore is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Yaver, apply this rule, and every db_restore call is checked against it from then on.
Questions about db_restore
Restore database from a backup file. It is categorised as a Destructive tool in the Yaver MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
db_restore accepts 2 parameters: db_url, backup_path. Required: backup_path. The full parameter table on this page comes from the server's own tool schema.
Register the Yaver MCP server in PolicyLayer and add a rule for db_restore: 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 Yaver. Nothing to install.
db_restore is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the db_restore 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 db_restore. 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.
db_restore is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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