How to Use the Deterministic JWT Inspector MCP in Windsurf

Q: How do I configure this MCP server in my Windsurf settings?

Open your mcpconfig.json file or use the Settings UI under Cascade. Add the server under the mcpServers key, and Cascade will auto-discover the inspectjwt tool on connection.

Get instant JWT payload and expiration data directly inside your Windsurf Cascade sessions without hunting for verification keys.

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Connect Deterministic JWT Inspector MCP to Windsurf

Create your Vinkius account to connect Deterministic JWT Inspector to Windsurf and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Deterministic JWT Inspector with Windsurf

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Cascade Auto-Decodes Tokens via MCP Server

The `inspect_jwt` tool decodes JWT headers and payloads on the fly during your Windsurf debugging sessions. You feed Cascade a raw token, and this MCP server extracts the claims without needing signature verification. Cascade uses this raw data to plan its next debugging steps. It reads the unverified token payload, spots expired timestamps, and immediately suggests the correct config fix.

Instant Expiry Calculations for Windsurf

The `inspect_jwt` tool calculates precise relative expiration times for any token string you paste into the IDE. It compares the `exp` claim against the current system time to show you exactly how many seconds remain. Cascade uses this metadata to diagnose auth failures autonomously. Instead of asking you why an API call failed, your agent checks the token status and tells you it expired ten minutes ago.

Zero-Key Debugging in Cascade

The `inspect_jwt` tool bypasses the need for public keys or shared secrets when you just need to inspect token contents. It isolates the Base64Url decoding process so you can view header claims instantly. This means Cascade inspects token structures without waiting for you to configure complex verification environments. Your workspace stays secure because raw tokens never leave the local context for external verification.

Setup guide

Set up Deterministic JWT Inspector MCP in Windsurf

Prerequisites

Windsurf IDE installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP configuration

Click the Cascade assistant icon in the sidebar, then click the hammer icon (🔨) at the top of the panel. Select "Configure" to open ~/.codeium/windsurf/mcp_config.json.
2

Add the Deterministic JWT Inspector MCP

Paste the JSON snippet shown on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Refresh MCPs

Go back to the hammer icon (🔨) in Cascade and click "Refresh". Windsurf will detect the new server. No full restart is needed — the connection is hot-reloaded.
4

Verify in Cascade

Start a new Cascade conversation and ask something like "Show my Deterministic JWT Inspector payment history." If connected, Cascade will call the Deterministic JWT Inspector tools directly. You will see a green dot next to the server name in the MCP panel.

mcp_config.json

{
  "mcpServers": {
    "deterministic-jwt-inspector-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by jwt-inspector. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Deterministic JWT Inspector MCP in Windsurf

The tool decodes token payloads instantly so Cascade can read the user claims. When an API call fails, Cascade calls `inspect_jwt` to verify if the token contains the correct scopes or if it has expired.

No, this MCP server does not verify signatures. It is built strictly for decoding and inspecting payload contents during local debugging. Use your standard backend libraries for cryptographic validation in production.

Open your mcp_config.json file or use the Settings UI under Cascade. Add the server under the mcpServers key, and Cascade will auto-discover the `inspect_jwt` tool on connection.

No, the server processes everything locally. It decodes the Base64Url strings deterministically without reaching out to external auth providers or key management services.

Your raw token strings are processed inside an ephemeral V8 sandbox. The server decodes the token claims locally and immediately discards the data, ensuring your sensitive payload claims never touch external storage.

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