# set_contact_custom_field_value

Set a single custom field value for a contact

Agent View of the PolicyLayer registry record for `set_contact_custom_field_value`. HTML page: https://policylayer.com/tools/instantkom-mcp-server/set-contact-custom-field-value

## Facts

- Tool: `set_contact_custom_field_value`
- Server: instantKOM MCP Server (`instantkom/mcp-server`) — https://policylayer.com/tools/instantkom-mcp-server.md
- Homepage: https://github.com/instantKOM/mcp-server
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "set_contact_custom_field_value",
    "arguments": {}
  }
}
```

## Why set_contact_custom_field_value is rated Medium

The tool creates or modifies contact metadata (custom field values) reversibly. It does not delete data, execute arbitrary code, move money, or trigger external operations with unpredictable side effects.

From the tool's own definition: "Tool name includes 'set' and description states 'Set a single custom field value for a contact' — this modifies contact data in the instantKOM platform."

## Use case

AI agents use set_contact_custom_field_value to create or update resources in instantKOM MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your instantKOM MCP Server environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches instantKOM MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_contact_custom_field_value": {
      "limits": [
        {
          "counter": "set_contact_custom_field_value_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on instantKOM MCP Server (244)

- `bulk_delete_custom_fields` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/bulk-delete-custom-fields.md
- `delete_account` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-account.md
- `delete_api_key` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-api-key.md
- `delete_bot` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-bot.md
- `delete_bot_env_var` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-bot-env-var.md
- `delete_bot_env_var_value` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-bot-env-var-value.md
- `delete_bot_filter` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-bot-filter.md
- `delete_broadcast` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-broadcast.md
- `delete_broadcast_media` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-broadcast-media.md
- `delete_chat` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-chat.md
- `delete_contact` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-contact.md
- `delete_contact_custom_field_value` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-contact-custom-field-value.md
- `delete_custom_field` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-custom-field.md
- `delete_export` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-export.md
- `delete_feed` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-feed.md
- `delete_flow` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-flow.md
- `delete_flow_edge` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-flow-edge.md
- `delete_flow_node` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-flow-node.md
- `delete_message` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-message.md
- `delete_message_media` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-message-media.md
- `delete_object_folder` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-object-folder.md
- `delete_poll` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-poll.md
- `delete_poll_option` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-poll-option.md
- `delete_qr_code` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-qr-code.md
- `delete_segmentation` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-segmentation.md
- `delete_short_link` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-short-link.md
- `delete_super_widget` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-super-widget.md
- `delete_tag` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-tag.md
- `delete_team_member_by_id` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-team-member-by-id.md
- `delete_template` — Destructive — https://policylayer.com/tools/instantkom-mcp-server/delete-template.md
- …and 214 more: https://policylayer.com/tools/instantkom-mcp-server.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=instantkom-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/instantkom-mcp-server