Remote MCP returns JSON-RPC -32601 Method not found on listTools() after successful connect()

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Hi everyone, I’m trying to connect to Atlassian’s remote MCP endpoint from a Bun/TypeScript script using `@openai/agents` with `MCPServerStreamableHttp`, and I can establish the connection, but calling `listTools()` fails with JSON-RPC error `-32601 Method not found`.

I’m trying to understand whether this should be handled as:

1. A normal capability/feature-detection case

2. An auth scope or audience problem

3. A transport/session setup issue

4. A server-side bug or unsupported MCP method on this endpoint

Environment:

- Bun 1.2.14

- `@openai/agents` 0.5.1

- `@modelcontextprotocol/sdk` 1.27.1

- Endpoint: https:// mcp .atlassian.com/v1/mcp

- OAuth token generated from Atlassian 3LO app using scopes:

- `offline_access`

- `read:jira-work`

- `write:jira-work`

- `read:confluence-content.all`

- `write:confluence-content`

Minimal repro:

```ts

import { MCPServerStreamableHttp } from "@openai/agents";




const jiramcp = new MCPServerStreamableHttp({

name: "Atlassian MCP",

url: "https://mcp.atlassian.com/v1/mcp",

requestInit: {

headers: {

Authorization: `Bearer ${process.env.JIRA_API_TOKEN}`,

Accept: "application/json, text/event-stream",

"Content-Type": "application/json",

    },

  },

cacheToolsList: true,

});




await jiramcp.connect();

const tools = await jiramcp.listTools();

console.log("Tools available in MCP:", tools);

```

Observed error:

```txt

McpError: MCP error -32601: Method not found

code: -32601,

data: undefined,

at new McpError (…/node_modules/@modelcontextprotocolmodelcontextprotocolmodelcontextprotocolmodelcontextprotocol/sdk/dist/esm/types.js:2018:9)

at fromEr@modelcontextprotocolmodelcontextprotocolor (…/node_modules/@modelcontextprotocolmodelcontextprotocolmodelcontextprotocolmodelcontextprotocol/sdk/dist/esm/types.js:20@modelcontextprotocolmodelcontextprotocol5:16)

at \_onrespo@modelcontextprotocolmodelcontextprotocolse (…/node_modules/@modelcontextprotocol/s@modelcontextprotocolmodelcontextprotocolk/dist/esm/shared/[my email]:482:36)

at (…/node_modules/@modelcontextprotocol/s@modelcontextprotocolmodelcontextprotocolk/dist/esm/shared/protocol.js:234:22)

at (…/node_modules/@modelcontextprotocol/sdk/dist/esm/client/streamableHttp.js:210:34)

```

If anyone has a working example for Atlassian remote MCP with OAuth 3LO and `listTools()`, that would help.