Parameters

Pre-fill tool inputs and lock down what values agents can pass

Parameter hooks let you pre-populate tool inputs so agents don’t need to specify them on every call — and optionally lock values so they can’t be overridden.

Pre-fill a parameter

Use Hook_Parameter to set a default value for any tool input.

Example — always query a specific Notion database:

Action: update
Category: Hook_Parameter
MCP Server: notion-API
Tool: query_database
Key: database_id
Value: "abc123-your-db-id"

“Set the default Notion database to my CRM database”

Example — lock Google Calendar queries to a specific calendar:

Action: update
Category: Hook_Parameter
MCP Server: google-calendar
Tool: list_events
Key: calendar_id
Value: "primary"

Template syntax

For parameters that need dynamic values, use the ${placeholder} template syntax with optional escaping.

SQL injection prevention — safely interpolate user input into queries:

{
  "template": "SELECT * FROM orders WHERE customer_email = '${email}'",
  "escape": "sql"
}

The escape field sanitizes the interpolated value before insertion. Supported escape modes: sql, json, url.

Lock vs default

A plain parameter value is a default — the AI can still override it if instructed. To make a value locked (non-overridable), set locked: true:

{ "value": "production-db", "locked": true }

Use locked parameters for security-critical inputs like database names, account IDs, or organization scopes.

Common use cases

Server	Parameter	Why
google-calendar	calendar_id	Prevent cross-calendar access
postgres / mysql	database	Lock to specific schema
notion-API	database_id	Prevent writes to wrong workspace
github-remote	owner / repo	Scope to your org’s repositories
salesforce	object_type	Restrict to allowed record types
google-sheets	spreadsheet_id	Lock to a specific sheet

How to configure

Ask the Configurator Agent:

“Set the default GitHub owner to my-org and lock it”

“Pre-fill the PostgreSQL database parameter with analytics_db”

Or use manage-profile-data directly with action: update, category: Hook_Parameter.