FME Flow MCP Server returns Job Metadata Only, Not Streaming JSON Output

Dear All starting using FME Flow - MCP Server,

I have an existing FME workspace performing semantic search using Microsoft Copilot Retrieval API searching against SharePoint Document Library, which was used with a FME Flow App (Semantic Document Search Engine). It will return HTML based search results with generative AI vibe-coded UI. It has been working quite well for our end users.

Now, since we are all very excited about potentials of FME Flow - MCP Server. I have made a copy of my workspace and convert the out to JSON writer or TEXT writer to streaming JSON of the semantic search results.

However, Claude AI seems to only be able to get returns of job submission log from the MCP tool:
 

{
  "id": 182,
  "featureOutputCount": 2,
  "requesterHost": "X.X.X.X",
  "requesterResultPort": 57366,
  "resultDatasetDownloadUrl": null,
  "status": "SUCCESS",
  "statusMessage": "Translation Successful",
  "timeFinished": 1774908390000,
  "timeQueued": 1774908385000,
  "timeStarted": 1774908385000,
  "outputLocation": "C:\\ProgramData\\Safe Software\\FMEFlow\\resources\\system\\temp\\engineresults\\FME_2653562A_1774908390173_6440"
}

If I ran the workspace used as a MCP tool on FME Flow directly, I see JSON of semantic search results streamed and shown...but not when it is called by the MCP server.
 

{
    "status": "success",
    "data": [
        {
            "fileName": "4002-4 Pruning, Trimming and Removal of Trees on T.pdf",
            "folderPath": "https://SPO.com=Corporate+Policies%2FBuildings+_+Grounds+-+Series+4000%2F4002+-+Parks",
            "folderPathDisplayName": "Corporate Policies/Buildings _ Grounds - Series 4000/4002 - Parks",
            "originationDatePST": "",
            "publicUrl": "https://XXX.com?file_path=Corporate%20Policies/Buildings%20_%20Grounds%20-%20Series%204000/4002%20-%20Parks/4002-4%20Pruning%2C%20Trimming%20and%20Removal%20of%20Trees%20on%20T.pdf",
            "webUrl": "Corporate Policies/Buildings _ Grounds - Series 4000/4002 - Parks/4002-4 Pruning, Trimming and Removal of Trees on T.pdf",
            "extractBrief": "<page_1&gt;\r\n**Approved:  **3 May 00 **Amended:  **14 Jul 03, 9 Jun 08, 7 Dec 09 &amp; 13 Aug 2012 **Approved By:  **Council  \r\n&lt;table&gt;\r\n&lt;tr&gt;\r\n&lt;td&gt; \r\n&lt;/td&gt;\r\n&lt;td&gt;  \r\n** Town of Qualicum Beach                          Policy Manual **\r\n&lt;/td&gt;\r\n&lt;/tr&gt;\r\n&lt;tr&gt;\r\n&lt;td&gt;  \r\n** Subject:  Buildings and Grounds **  \r\n**Pruning, Trimming and Removal of Trees on Town- Controlled Lands **\r\n&lt;/td&gt;\r\n&lt;/tr&gt;\r\n&lt;tr&gt;\r\n&lt;td&gt;  \r\n** Policy Number:  4002-4 **\r\n&lt;/td&gt;\r\n&lt;/tr&gt;\r\n&lt;/table&gt;\r\n\r\n  \r\n** Purpose **This Policy recognizes the impor...",
            "type": "Document",
            "searchQuery": "tree removal policy",
            "relevanceScore": 0.82330000000000003,
            "pageNumber": "1"
        },
        {
            "fileName": "Sept 2 Regular.pdf",
            "folderPathDisplayName": "Committee Agendas/Former Committees Agendas/Parks _ Recreation Commission/2010 Parks & Recreation Commission Agendas",
            "originationDatePST": "2010-09-02",
            "publicUrl": "https://XXX.com?file_path=Committee%20Agendas/Former%20Committees%20Agendas/Parks%20_%20Recreation%20Commission/2010%20Parks%20%26%20Recreation%20Commission%20Agendas/Sept%202%20Regular.pdf",
            "webUrl": "Committee Agendas/Former Committees Agendas/Parks _ Recreation Commission/2010 Parks & Recreation Commission Agendas/Sept 2 Regular.pdf",
            "extractBrief": "&lt;page_7&gt;\r\n![][image_/pGCOYGEcJrcQZ/yqptj2w==] \r\n&lt;/page_7&gt;\r\n&lt;page_8&gt;\r\nTown of Qualicum Beach MEMORANDUM TO: M.D.\\_(Mark) Brown, CAO FOR: Regular Council August 9, 2010 FROM: Toni Botelho, Parks Foreman &amp; Arborist SUBJECT: Draft Policy No. 4002-7 Notice of Removal of Trees in Community Park RECOMMENDATION THAT Council approves Policy No. 4002-7 ~ Buildings and Grounds ~ Notice of Removal of Trees in Community Park, as presented August 9, 2010. PURPOSE To respond to Council&#39;s request for a policy t...",
            "type": "Document",
            "searchQuery": "tree removal policy",
            "relevanceScore": 0.81850000000000001,
            "pageNumber": "7"
        },
        {
            "fileName": null,
            "folderPath": null,
            "folderPathDisplayName": null,
            "originationDatePST": null,
            "publicUrl": null,
            "webUrl": null,
            "extractBrief": null,
            "type": null,
            "searchQuery": "tree removal policy",
            "relevanceScore": null,
            "pageNumber": null
        },
        {
            "fileName": null,
            "folderPath": "https://SPO.com=",
            "folderPathDisplayName": null,
            "originationDatePST": null,
            "publicUrl": null,
            "webUrl": null,
            "extractBrief": null,
            "type": null,
            "searchQuery": "tree removal policy",
            "relevanceScore": null,
            "pageNumber": null
        }
    ]
}

I watched the webinar multiple times but can’t seem to find what might be the solution.

Thanks a lot!
Reno