Unable to add Supabase MCP to Perplexity

[ghostp1lot]

Bug report

Describe the bug

Unable to add Supabase MCP to Perplexity

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. Go to https://www.perplexity.ai/account/connectors
2. Click on + Custom Connector
3. Set MCP Server URL to https://mcp.supabase.com/mcp
4. Agree to I understand custom connectors can introduce risks.
5. Click Add
6. Click Enable on the new connector
7. See error: {"message":": Unrecognized key(s) in object: 'actor'"} on the page:

https://api.supabase.com/v1/oauth/authorize?
client_id=<<REDACTED>>&
redirect_uri=<<REDACTED>>&
response_type=code&
state=<<REDACTED>>&
actor=user&
code_challenge=<<REDACTED>>&
code_challenge_method=S256&
scope=organizations%3Aread+projects%3Aread+projects%3Awrite+database%3Awrite+database%3Aread+analytics%3Aread+secrets%3Aread+edge_functions%3Aread+edge_functions%3Awrite+environment%3Aread+environment%3Awrite+storage%3Aread

EASY FIX

Just remove the 'actor' parameter from the URL and it works perfectly

https://api.supabase.com/v1/oauth/authorize?
client_id=<<REDACTED>>&
redirect_uri=<<REDACTED>>&
response_type=code&
state=<<REDACTED>>&
code_challenge=<<REDACTED>>&
code_challenge_method=S256&
scope=organizations%3Aread+projects%3Aread+projects%3Awrite+database%3Awrite+database%3Aread+analytics%3Aread+secrets%3Aread+edge_functions%3Aread+edge_functions%3Awrite+environment%3Aread+environment%3Awrite+storage%3Aread

Expected behavior

Supabase MCP connector works

[gregnr]

Hey @ghostp1lot thanks for reporting. This issue looks very similar to #226 with Notion. Our OAuth server intentionally has an explicit allow list for query params to be spec-compliant and also as a security best practice. Silently accepting unknown parameters that aren't part of the spec implies that we've processed them and if Perplexity thinks actor is influencing the authorization, they'd be operating on a false assumption.

Perplexity should probably not be sending this extra query param - are you able to raise this with their team?