We’ve been setting up the Discourse MCP server to connect our Discourse instance to Claude Desktop via config files. When using a single-use API key with granular access controls, the MCP server throws a 403 Forbidden error because it can’t read about.json. Snippet from the Console Logs [2026-03-1…

it seems reasonable to include access to about.json, I’ve opened a PR and will run this by the team https://github.com/discourse/discourse/pull/38948

[immagine] aangi: The API username or key is invalid Also, is this a misleading error we can improve?

Hi Michael, it does seem like a misleading error. However, because we cannot change the scope of the user once its been created, it is possible that in case of granular access, the API username is being rendered invalid because there is no about.json file.

Hi @awesomerobot @supermathie any update on this?

I’ve merged the change, so once it hits tests-passed you can rebuild and pull in the updated version and everything should work.

Utente API con accesso granulare non può leggere about.json | Discourse MCP

Supporto

supermathie (Michael Brown) 29 Marzo 2026, 3:11am 4

Inoltre, si tratta di un messaggio di errore fuorviante che possiamo migliorare?

Argomento		Risposte	Visualizzazioni
User API keys specification Integrations rest-api , reference	69	36530	Settembre 22, 2025
Allow API use by regular users, not just admins Development rest-api	6	1426	Febbraio 14, 2023
Access via Discourse API, key and/or user rejected Development rest-api	2	901	Dicembre 1, 2023
Get an API key's scopes and user level via the API Development rest-api	0	637	Novembre 16, 2023
403 error when connecting Zapier to Discourse Support	13	959	Settembre 25, 2020

Utente API con accesso granulare non può leggere about.json | Discourse MCP

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