Claudian returns 403 "Request not allowed" even though CLI login succeeds

[bobenba09-sudo]

Environment

• Claudian version: 2.0.27
• macOS
• Obsidian launched normally (via Dock/Finder)
• Standalone Claude Code CLI: v2.1.193, installed at /usr/local/bin/claude

Problem
Claudian consistently returns:

Error: authentication_failed
Failed to authenticate. API Error: 403 {"error":{"type":"forbidden","message":"Request not allowed"}}

even after:

1. Running claude auth login in Terminal (confirms claude auth status shows loggedIn: true, and claude -p "..." works fine directly from the CLI).
2. Fully quitting and relaunching Obsidian so Claudian re-reads fresh credentials.
3. Confirming (via Keychain Access.app) that Obsidian is explicitly listed in the "Access Control" allow-list for the Claude Code-credentials keychain item, so it isn't a Keychain ACL/permission issue.

This matches the symptoms in #90 and #325 (terminal CLI works fine, Claudian does not), which are marked stale/closed as not planned.

Possible lead
Grepping the bundled main.js in the plugin, I found it embeds:

@anthropic-ai/claude-agent-sdk
SDK_VERSION = "0.3.159"

This appears noticeably older than the SDK version used by the current official Claude Desktop app (0.3.197 as of writing) and the standalone CLI (2.1.193). It's possible the Anthropic API is rejecting requests from this outdated bundled SDK version with a 403, independent of local auth/keychain state. Bumping the bundled claude-agent-sdk dependency may resolve this.

Happy to provide more logs/details if helpful.

[sisyphosloughs]

Same here. My guess: Antropic changed the access, because vscode today asked for an authentication-token. I hope this will not turn the plugin for API only. I was quite happy to use the plugin with Anthropics pro plan only.

[sisyphosloughs]

Same here. My guess: Antropic changed the access, because vscode today asked for an authentication-token. I hope this will not turn the plugin for API only. I was quite happy to use the plugin with Anthropics pro plan only.

No more issue for me anymore. After updating the Claude app on my Mac today, Claudian is working again.

[github-actions]

This issue has been inactive for 7 days and will be closed in 7 days if no further activity occurs.

[Ehrenplatz]

Same issue here. CLI login works fine (claude in Terminal shows "Welcome back", Claude Max subscription confirmed), and Obsidian is explicitly listed in the Keychain Access Control list for "Claude Code-credentials". Still consistently getting:
Error: authentication_failed
Failed to authenticate. API Error: 401
{"type":"error","error":{"type":"authentication_error","message":"Invalid authentication credentials"}}
Also tried setting the Claude CLI path manually (/opt/homebrew/bin/claude, confirmed both claude and node resolve to the same dirname) and adding PATH as a custom environment variable — no change.
Environment:

Claudian version: 2.0.31
macOS version: Tahoe 26.5.1
Standalone Claude Code CLI: works fine via which claude → /opt/homebrew/bin/claude

[christuan0421]

I'm hitting the same issue — authentication_failed / API Error 401 "Invalid authentication credentials" on Claudian 2.0.34, right after auto-updating from 2.0.27. claude --version and claude CLI login (Pro subscription, firstParty auth) both check out fine outside Obsidian, so this looks unrelated to local credentials. Fully quitting and relaunching Obsidian did not resolve it. +1 on this being a plugin-side issue (possibly the bundled SDK version mentioned above).

[github-actions]

This issue has been inactive for 7 days and will be closed in 7 days if no further activity occurs.

[github-actions]

Closed due to 14 days of inactivity.