Create a new field in an Airtable table. Supports all field types including computed fields (formula, rollup, lookup, count) that are not available via the official API. FIELD TYPES (fieldType parameter): Supported names: "text", "multilineText", "number", "checkbox", "date", "singleSelect", "mul...
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AI agents use create_field to create or modify resources in Airtable User MCP. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call create_field repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Airtable User MCP.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"create_field": {
"limits": [
{
"counter": "create_field_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Airtable User MCP policy for all 67 tools.
These attack patterns abuse exactly the kind of access create_field gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Create a new field in an Airtable table. Supports all field types including computed fields (formula, rollup, lookup, count) that are not available via the official API. FIELD TYPES (fieldType parameter): Supported names: "text", "multilineText", "number", "checkbox", "date", "singleSelect", "multipleSelects", "rating", "formula", "rollup", "lookup", "count" Friendly aliases (auto-normalized): "url" → type: "text" with validatorName = "url" "email" → type: "text" with validatorName = "email" "phone" / "phoneNumber" → type: "text" with validatorName = "phoneNumber" "dateTime" → type: "date" with isDateTime: true TYPE OPTIONS by fieldType: formula: { formulaText: "..." } rollup: { relationColumnId: "fldLINK", foreignTableRollupColumnId: "fldTARGET", formulaText: "SUM(values)" } (formulaText is REQUIRED — e.g. "SUM(values)", "COUNTA(values)", "IF(OR(values='X'),1,0)")) (old keys fieldIdInLinkedTable/recordLinkFieldId are auto-translated for backward compat) lookup: { relationColumnId: "fldLINK", foreignTableRollupColumnId: "fldTARGET" } (old keys fieldIdInLinkedTable/recordLinkFieldId are auto-translated for backward compat) count: { recordLinkFieldId } number (integer): { format: "integer", negative: false } number (currency): { format: "currency", symbol: "$", precision: 2, negative: false } number (percent): { format: "percentV2", precision: 2, negative: false } date / dateTime: { dateFormat: "Local"|"us"|"european"|"iso"|"friendly", timeFormat: "12hour"|"24hour", timeZone: "UTC"|"client"|<IANA-tz>, shouldDisplayTimeZone: true|false, isDateTime: true (auto for dateTime) } singleSelect: { choices: [{ name: "Option A", color: "blueLight2" }] } multipleSelects: { choices: [{ name: "PC" }, { name: "Xbox", color: "greenLight2" }] } text / multilineText / checkbox / rating: omit typeOptions entirely — passing {} causes a 422 SELECT CHOICES: pass an array of { name, color? } objects — the client auto-converts to the object format the internal API requires and generates valid choice IDs.. It is categorised as a Write tool in the Airtable User MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Airtable User MCP server in PolicyLayer and add a rule for create_field: 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 Airtable User MCP. Nothing to install.
create_field is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_field 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 create_field. 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.
create_field is provided by the Airtable User MCP server (airtable-user-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 67 Airtable User MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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