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The MCP Server does not have its own permission system. What your AI agent can access is determined entirely by the platform-level permissions assigned to the user whose token is being used. If a user cannot see a layer on the platform, that layer will not appear in list_layers. If a table is inaccessible, execute_sql will return an error for queries against it. The mapping is 1:1 — what the token’s user sees in the platform is exactly what the AI agent can access through the MCP.
Data-level permissions are only enforced on Growth or Custom plans. On Starter, all members have Manager-level access to all data, so all tokens have full visibility.

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Token types and permission behavior

When you create a token in the MCP Server, you choose between two scoping options. The choice determines how the token relates to platform permissions.

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Full access tokens

A full access token inherits the permissions of the user who created it and stays in sync dynamically. If that user gains access to a new layer, the token immediately reflects it. If their access to a table is revoked, the token loses that access automatically — no token rotation needed. Tokens created during the OAuth flow are full access tokens tied to the authenticating user.

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Scoped tokens

A scoped token is restricted to the specific tables you select at creation time. That list is fixed: platform permission changes have no effect on what the token can see. To expand or restrict a scoped token’s access, edit or recreate it.
A token can only be scoped to tables the creating user has access to at the time of creation.

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Practical examples

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Example 1: User receives Viewer access to an entire layer

Scenario: A member is granted Viewer access to the raw layer, which contains dozens of tables and several volumes. Action on the platform: An admin grants Viewer access to the raw layer under Workspace → Permissions. What to expect in the MCP:
  • list_layers now includes the raw layer.
  • list_volumes returns volumes inside raw.
  • list_tables and get_relevant_tables_ddl include tables from raw.
  • generate_sql and execute_sql can query those tables.

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Example 2: Table permission is revoked for a specific user

Scenario: A member previously had Viewer access to trusted.customer_orders. That permission is now revoked directly on the table. Action on the platform: The permission is removed from the table — no group change is involved. What to expect in the MCP:
  • execute_sql returns an error for any query that references trusted.customer_orders.
  • get_table_preview returns an error for that table.
  • get_relevant_tables_ddl no longer returns its schema.
  • list_tables no longer includes it.

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Example 3 (Troubleshooting): Group permission revoked — agent still has access

Scenario: An admin revokes the raw layer permission from a group. An AI agent using a full access token from a user in that group can still query tables in raw. Most likely causes:
  1. Conflicting group permissions. If the user belongs to another group — including the built-in All group — that still has access to raw, Nekt grants the highest permission the user holds from any assignment. Revoking access from one group alone does not remove access if another group retains it.
  2. Misconfigured change. Verify the permission was saved correctly in Workspace → Groups or on the layer’s Permissions tab.
Nekt always applies the highest permission a user has from any group or direct assignment. Revoking access in one group has no effect if another group (or a direct assignment) still grants it.

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How permissions apply to each tool

Most tools filter their output automatically to what the token can access. Tools that operate on resources outside the token’s scope return an error rather than partial results.

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Troubleshooting

The most common causes:
  • Group membership: The token’s user may belong to a group — including the built-in All group — that still has access to the resource. Check effective permissions in Workspace → Members.
  • Scoped token with a stale scope: If you’re using a scoped token, its table list was fixed at creation time. A table revoked on the platform may still be in the token’s scope. Edit or recreate the token to remove it.
The most common causes:
  • Permission not yet assigned: Verify the permission is set correctly in Workspace → Permissions or on the resource’s own Permissions tab.
  • Scoped token missing the table: If you’re using a scoped token, the table may not have been included at creation time. Edit or recreate the token.
To confirm which type of token you’re using, go to the MCP Server.