support optional static oauth client info instead of requiring dynamic client registration

README.md

@@ -131,6 +131,30 @@ npx mcp-remote https://example.remote/server --transport sse-only
 - `http-only`: Only uses HTTP transport, fails if the server doesn't support it
 - `sse-only`: Only uses SSE transport, fails if the server doesn't support it
 
+#### Static OAuth Client Metadata
+
+MCP Remote supports providing static OAuth client metadata instead of using the mcp-remote defaults.
+This is useful when connecting to OAuth servers that expect specific client/software IDs or scopes.
+
+Provide the client metadata as JSON with the `--static-oauth-client-metadata` flag:
+
+```bash
+npx mcp-remote https://example.remote/server --static-oauth-client-metadata '{ "scope": "space separated scopes" }'
+```
+
+### Static OAuth Client Information
+
+MCP Remote supports providing static OAuth client information instead of using dynamic client registration.
+This is useful when connecting to OAuth servers that require pre-registered clients.
+
+Provide the client information with the `--static-oauth-client-info` flag:
+
+```bash
+export MCP_REMOTE_CLIENT_ID=xxx
+export MCP_REMOTE_CLIENT_SECRET=yyy
+npx mcp-remote https://example.remote/server --static-oauth-client-info "{ \"client_id\": \"$MCP_REMOTE_CLIENT_ID\", \"client_secret\": \"$MCP_REMOTE_CLIENT_SECRET\" }"
+```
+
 ### Claude Desktop
 
 [Official Docs](https://modelcontextprotocol.io/quickstart/user)

src/client.ts

@@ -22,6 +22,7 @@ import {
   connectToRemoteServer,
   TransportStrategy,
 } from './lib/utils'
+import { StaticOAuthClientInformationFull, StaticOAuthClientMetadata } from './lib/types'
 import { createLazyAuthCoordinator } from './lib/coordination'
 
 /**
@@ -32,6 +33,8 @@ async function runClient(
   callbackPort: number,
   headers: Record<string, string>,
   transportStrategy: TransportStrategy = 'http-first',
+  staticOAuthClientMetadata: StaticOAuthClientMetadata,
+  staticOAuthClientInfo: StaticOAuthClientInformationFull,
 ) {
   // Set up event emitter for auth flow
   const events = new EventEmitter()
@@ -47,6 +50,8 @@ async function runClient(
     serverUrl,
     callbackPort,
     clientName: 'MCP CLI Client',
+    staticOAuthClientMetadata,
+    staticOAuthClientInfo,
   })
 
   // Create the client
@@ -152,8 +157,8 @@ async function runClient(
 
 // Parse command-line arguments and run the client
 parseCommandLineArgs(process.argv.slice(2), 3333, 'Usage: npx tsx client.ts <https://server-url> [callback-port]')
-  .then(({ serverUrl, callbackPort, headers, transportStrategy }) => {
+  .then(({ serverUrl, callbackPort, headers, transportStrategy, staticOAuthClientMetadata, staticOAuthClientInfo }) => {
-    return runClient(serverUrl, callbackPort, headers, transportStrategy)
+    return runClient(serverUrl, callbackPort, headers, transportStrategy, staticOAuthClientMetadata, staticOAuthClientInfo)
   })
   .catch((error) => {
     console.error('Fatal error:', error)

src/lib/node-oauth-client-provider.ts

@@ -7,9 +7,10 @@ import {
   OAuthTokens,
   OAuthTokensSchema,
 } from '@modelcontextprotocol/sdk/shared/auth.js'
-import type { OAuthProviderOptions } from './types'
+import type { OAuthProviderOptions, StaticOAuthClientMetadata } from './types'
 import { readJsonFile, writeJsonFile, readTextFile, writeTextFile } from './mcp-auth-config'
 import { getServerUrlHash, log, MCP_REMOTE_VERSION } from './utils'
+import { StaticOAuthClientInformationFull } from './types'
 
 /**
  * Implements the OAuthClientProvider interface for Node.js environments.
@@ -22,6 +23,8 @@ export class NodeOAuthClientProvider implements OAuthClientProvider {
   private clientUri: string
   private softwareId: string
   private softwareVersion: string
+  private staticOAuthClientMetadata: StaticOAuthClientMetadata
+  private staticOAuthClientInfo: StaticOAuthClientInformationFull
 
   /**
    * Creates a new NodeOAuthClientProvider
@@ -34,6 +37,8 @@ export class NodeOAuthClientProvider implements OAuthClientProvider {
     this.clientUri = options.clientUri || 'https://github.com/modelcontextprotocol/mcp-cli'
     this.softwareId = options.softwareId || '2e6dc280-f3c3-4e01-99a7-8181dbd1d23d'
     this.softwareVersion = options.softwareVersion || MCP_REMOTE_VERSION
+    this.staticOAuthClientMetadata = options.staticOAuthClientMetadata
+    this.staticOAuthClientInfo = options.staticOAuthClientInfo
   }
 
   get redirectUrl(): string {
@@ -50,6 +55,7 @@ export class NodeOAuthClientProvider implements OAuthClientProvider {
       client_uri: this.clientUri,
       software_id: this.softwareId,
       software_version: this.softwareVersion,
+      ...this.staticOAuthClientMetadata,
     }
   }
 
@@ -58,6 +64,9 @@ export class NodeOAuthClientProvider implements OAuthClientProvider {
    * @returns The client information or undefined
    */
   async clientInformation(): Promise<OAuthClientInformation | undefined> {
+    if (this.staticOAuthClientInfo) {
+      return this.staticOAuthClientInfo
+    }
     // log('Reading client info')
     return readJsonFile<OAuthClientInformation>(this.serverUrlHash, 'client_info.json', OAuthClientInformationSchema)
   }

src/lib/types.ts

@@ -1,4 +1,5 @@
 import { EventEmitter } from 'events'
+import { OAuthClientInformationFull, OAuthClientMetadata } from '@modelcontextprotocol/sdk/shared/auth.js'
 
 /**
  * Options for creating an OAuth client provider
@@ -20,6 +21,10 @@ export interface OAuthProviderOptions {
   softwareId?: string
   /** Software version to use for OAuth registration */
   softwareVersion?: string
+  /** Static OAuth client metadata to override default OAuth client metadata */
+  staticOAuthClientMetadata?: StaticOAuthClientMetadata
+  /** Static OAuth client information to use instead of OAuth registration */
+  staticOAuthClientInfo?: StaticOAuthClientInformationFull
 }
 
 /**
@@ -33,3 +38,7 @@ export interface OAuthCallbackServerOptions {
   /** Event emitter to signal when auth code is received */
   events: EventEmitter
 }
+
+// optional tatic OAuth client information
+export type StaticOAuthClientMetadata = OAuthClientMetadata | null | undefined
+export type StaticOAuthClientInformationFull = OAuthClientInformationFull | null | undefined

src/lib/utils.ts

@@ -10,7 +10,7 @@ export const REASON_TRANSPORT_FALLBACK = 'falling-back-to-alternate-transport'
 
 // Transport strategy types
 export type TransportStrategy = 'sse-only' | 'http-only' | 'sse-first' | 'http-first'
-import { OAuthCallbackServerOptions } from './types'
+import { OAuthCallbackServerOptions, StaticOAuthClientInformationFull, StaticOAuthClientMetadata } from './types'
 import express from 'express'
 import net from 'net'
 import crypto from 'crypto'
@@ -426,6 +426,26 @@ export async function parseCommandLineArgs(args: string[], defaultPort: number,
     }
   }
 
+  let staticOAuthClientMetadata: StaticOAuthClientMetadata = null
+  const staticOAuthClientMetadataIndex = args.indexOf('--static-oauth-client-metadata')
+  if (staticOAuthClientMetadataIndex !== -1 && staticOAuthClientMetadataIndex < args.length - 1) {
+    staticOAuthClientMetadata = JSON.parse(args[staticOAuthClientMetadataIndex + 1])
+    if (staticOAuthClientMetadata) {
+      log(`Using static OAuth client metadata`)
+    }
+  }
+
+  // parse static OAuth client information, if provided
+  // defaults to OAuth dynamic client registration
+  let staticOAuthClientInfo: StaticOAuthClientInformationFull = null
+  const staticOAuthClientInfoIndex = args.indexOf('--static-oauth-client-info')
+  if (staticOAuthClientInfoIndex !== -1 && staticOAuthClientInfoIndex < args.length - 1) {
+    staticOAuthClientInfo = JSON.parse(args[staticOAuthClientInfoIndex + 1])
+    if (staticOAuthClientInfo) {
+      log(`Using static OAuth client information`)
+    }
+  }
+
   if (!serverUrl) {
     log(usage)
     process.exit(1)
@@ -468,7 +488,7 @@ export async function parseCommandLineArgs(args: string[], defaultPort: number,
     })
   }
 
-  return { serverUrl, callbackPort, headers, transportStrategy }
+  return { serverUrl, callbackPort, headers, transportStrategy, staticOAuthClientMetadata, staticOAuthClientInfo }
 }
 
 /**

src/proxy.ts

@@ -21,6 +21,7 @@ import {
   MCP_REMOTE_VERSION,
   TransportStrategy,
 } from './lib/utils'
+import { StaticOAuthClientInformationFull, StaticOAuthClientMetadata } from './lib/types'
 import { NodeOAuthClientProvider } from './lib/node-oauth-client-provider'
 import { createLazyAuthCoordinator } from './lib/coordination'
 
@@ -32,6 +33,8 @@ async function runProxy(
   callbackPort: number,
   headers: Record<string, string>,
   transportStrategy: TransportStrategy = 'http-first',
+  staticOAuthClientMetadata: StaticOAuthClientMetadata,
+  staticOAuthClientInfo: StaticOAuthClientInformationFull,
 ) {
   // Set up event emitter for auth flow
   const events = new EventEmitter()
@@ -47,6 +50,8 @@ async function runProxy(
     serverUrl,
     callbackPort,
     clientName: 'MCP CLI Proxy',
+    staticOAuthClientMetadata,
+    staticOAuthClientInfo,
   })
 
   // Create the STDIO transport for local connections
@@ -136,8 +141,8 @@ to the CA certificate file. If using claude_desktop_config.json, this might look
 
 // Parse command-line arguments and run the proxy
 parseCommandLineArgs(process.argv.slice(2), 3334, 'Usage: npx tsx proxy.ts <https://server-url> [callback-port]')
-  .then(({ serverUrl, callbackPort, headers, transportStrategy }) => {
+  .then(({ serverUrl, callbackPort, headers, transportStrategy, staticOAuthClientMetadata, staticOAuthClientInfo }) => {
-    return runProxy(serverUrl, callbackPort, headers, transportStrategy)
+    return runProxy(serverUrl, callbackPort, headers, transportStrategy, staticOAuthClientMetadata, staticOAuthClientInfo)
   })
   .catch((error) => {
     log('Fatal error:', error)