MCP OAuth strict issuer diagnostics

Strict issuer MCP OAuth client behavior

See whether IDEs and developer tools use CIMD, fall back to Dynamic Client Registration, or send static client IDs during OAuth.

Built by @AkxenTech

Authorization server: /.well-known/oauth-authorization-server

Test endpoint

Add this Streamable HTTP MCP server URL to the client you want to test.

https://strict-cimd-reader.akxen.tech/mcp

Codex CLI

codex mcp add cimd_reader \
  --url https://strict-cimd-reader.akxen.tech/mcp \
  --oauth-resource https://strict-cimd-reader.akxen.tech/mcp

codex mcp login cimd_reader

Claude Code

claude mcp add --transport http \
  cimd_reader \
  https://strict-cimd-reader.akxen.tech/mcp

# then run /mcp in Claude Code

VS Code

{
  "servers": {
    "cimd_reader": {
      "type": "http",
      "url": "https://strict-cimd-reader.akxen.tech/mcp",
      "oauth": {
        "clientId": "https://vscode.dev/oauth/client-metadata.json"
      }
    }
  }
}

Claude Code

CLI

Observed result: No OAuth traffic observed yet.
Latest user agent: Not observed
Latest event: Not observed
Client version: Unknown
Claimed status: verified
Metadata name: Claude Code
Observed behavior: unknown
Metadata URL: https://claude.ai/oauth/claude-code-client-metadata
Client URI: Not observed
Grant types: Not observed
Response types: Not observed
Token auth: Not observed
App type: Not observed
Redirect URIs: Not observed

Last observed: not observed

Codex CLI

CLI

Observed result: No OAuth traffic observed yet.
Latest user agent: Not observed
Latest event: Not observed
Client version: Unknown
Claimed status: unknown
Metadata name: Codex CLI
Observed behavior: unknown
Metadata URL: Unknown
Client URI: Not observed
Grant types: Not observed
Response types: Not observed
Token auth: Not observed
App type: Not observed
Redirect URIs: Not observed

Last observed: not observed

Cursor

IDE

Observed result: No OAuth traffic observed yet.
Latest user agent: Not observed
Latest event: Not observed
Client version: Unknown
Claimed status: unknown
Metadata name: Cursor
Observed behavior: unknown
Metadata URL: Unknown
Client URI: Not observed
Grant types: Not observed
Response types: Not observed
Token auth: Not observed
App type: Not observed
Redirect URIs: Not observed

Last observed: not observed

MCPJam

Debugger

Observed result: No OAuth traffic observed yet.
Latest user agent: Not observed
Latest event: Not observed
Client version: Unknown
Claimed status: unknown
Metadata name: MCPJam
Observed behavior: unknown
Metadata URL: Unknown
Client URI: Not observed
Grant types: Not observed
Response types: Not observed
Token auth: Not observed
App type: Not observed
Redirect URIs: Not observed

Last observed: not observed

Visual Studio Code

IDE

Observed result: No OAuth traffic observed yet.
Latest user agent: Not observed
Latest event: Not observed
Client version: Unknown
Claimed status: unknown
Metadata name: Visual Studio Code
Observed behavior: unknown
Metadata URL: Unknown
Client URI: Not observed
Grant types: Not observed
Response types: Not observed
Token auth: Not observed
App type: Not observed
Redirect URIs: Not observed

Last observed: not observed