Coding rules for authentication in a Tableau server application, covering middleware order and three supported authentication paths.

Use it when changing passthrough authentication, embedded OAuth with PKCE, Tableau Cloud OAuth, token validation, session caching, or authentication middleware.

It keeps authentication changes consistent with how sessions, OAuth tokens, scopes, and request handling work in the application.

auth — Cursor rule for Cursor by tableau/tableau-mcp

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/tableau/tableau-mcp

Made for: Cursor.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/rules/tableau/tableau-mcp/auth/github.svg)](https://agentmods.dev/rules/tableau/tableau-mcp/auth)

Your own site

<a href="https://agentmods.dev/rules/tableau/tableau-mcp/auth"><img src="https://agentmods.dev/badge/rules/tableau/tableau-mcp/auth/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/rules/tableau/tableau-mcp/auth"><img src="https://agentmods.dev/badge/rules/tableau/tableau-mcp/auth.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Nothing until a file matches its globs; then the whole rule loads.

When invoked 878 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00878
Opus 5.5	$0.00000	$0.00351
Sonnet 5.5	$0.00000	$0.00176
Haiku 4.5	$0.00000	$0.00088

Measured 1mo ago against content hash 8d49ceb6fc28, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

auth scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

3 near-identical copies found in the catalogue:

auth — 100% identical, 0 lines differ
auth — 100% identical, 0 lines differ
auth — 100% identical, 0 lines differ

.cursor/rules/auth.mdc · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Auth Standards

Three Auth Paths

1. Passthrough Auth

Header x-tableau-auth or cookie workgroup_session_id
Validated via RestApi.authenticatedServerMethods.getCurrentServerSession()
Optional session caching via ExpiringMap (configurable interval)
Location: src/server/passthroughAuthMiddleware.ts
Enabled when config.enablePassthroughAuth is true
MCP scopes NOT enforced (no way to verify original token scopes)

2. Embedded OAuth (PKCE)

JWE-encrypted MCP access tokens signed with server's private key
Contains embedded Tableau access/refresh tokens
EmbeddedAccessTokenValidator validates via jose
Location: src/server/oauth/provider.ts, accessTokenValidator.ts, token.ts, authorize.ts, callback.ts

3. Tableau Cloud OAuth

Tableau Cloud JWT Bearer tokens
TableauAccessTokenValidator validates JWT claims
Location: src/server/oauth/provider.ts, accessTokenValidator.ts

Middleware Chain Order (express.ts)

handlePingRequest
  → passthroughAuthMiddleware (if enabled)
    → oauthProvider.authMiddleware
      → validateProtocolVersion
        → createMcpServer

Auth Info Flow

req.auth
  → getTableauAuthInfo(req.auth)
    → TableauAuthInfo (discriminated union: 'X-Tableau-Auth' | 'Bearer' | 'Passthrough')
      → TableauRequestHandlerExtra.tableauAuthInfo
        → useRestApi() (handles sign-in, token setup, sign-out lifecycle)

TableauAuthInfo Type (src/server/oauth/schemas.ts)

Discriminated union on type field:

'X-Tableau-Auth' — username, server, siteId?, userId?, accessToken?, refreshToken?
'Bearer' — username, server, siteId, userId?, raw (the JWT string)
'Passthrough' — username, userId, server, siteId, raw (the session token)

REST API Auth Lifecycle (src/restApiInstance.ts)

useRestApi() is the single entry point for all authenticated API calls:

Creates a fresh RestApi instance per call
Routes to correct auth method based on tableauAuthInfo.type and config.auth
Auth methods: pat, direct-trust, uat, oauth
PAT/direct-trust sessions are ephemeral (signed out after use)
OAuth/passthrough sessions are long-lived (NOT signed out)
Accepts jwtScopes for direct-trust/UAT token generation

Read the full file on GitHub · 87 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 87 lines · 0 tokens per session scan A 8d49ceb6fc28

Subscribe to this mod's changes

auth is a cursor rule published in the GitHub repository tableau/tableau-mcp (351 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 878 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Backend and APIs Security mcp mcp-server modelcontextprotocol tableau

auth

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

Copies of this mod

How it starts

Auth Standards

Three Auth Paths

1. Passthrough Auth

2. Embedded OAuth (PKCE)

3. Tableau Cloud OAuth

Middleware Chain Order (express.ts)

Auth Info Flow

TableauAuthInfo Type (src/server/oauth/schemas.ts)

REST API Auth Lifecycle (src/restApiInstance.ts)

What this file has done since we first saw it

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