[Error] Error: MPC -32603: Unrecognized field "form"

[rian-gomes-keeggo]

Current Behavior

I was trying to integrate fcli with copilot through vscode and recieve a error Unrecognized field "form"

[error] Error: MPC -32603: Unrecognized field "form" (class io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation), not marked as ignorable (0 known properties: ])
at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: io.modelcontextprotocol.spec.McpSchema$InitializeRequest["capabilities"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities["elicitation"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation["form"])
at O8i.O (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:2265:35574)
at O8i.L (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:2265:35369)
at Sce.value (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:2265:34358)
at E.C (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:29:2349)
at E.fire (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:29:2568)
at bMs.pushMessage (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:604:55563)
at gli.$onDidReceiveMessage (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:604:52099)
at YRt.S (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3894:40815)
at YRt.Q (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3894:40593)
at YRt.M (vscode-file://vscode-app/c:/Users/$USER/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3894:39681)

Expected Behavior

No response

Steps To Reproduce

1. Install copilot chat AI extension
2. create the archieve mcp.json in the .vscode with this configuration:
3. { "servers": { "fortify-ssc": { "type": "stdio", "command": "C:\\Tools\\fcli\\fcli-314.exe", "args": [ "util", "mcp-server", "start", "--module=ssc" ] } } }
4. Start mcp server

Environment

fcli-314.exe --version
fcli version 3.14.1, built on 2025-12-19 14:45:59
SO: Windows 11
IDE: Vscode Version: 1.107.1
LLM: COPILOT
SSC: 24.4

Anything else?

No response

[rian-gomes-keeggo]

025-12-23 17:33:40.611 [debug] [editor -> server] {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{"roots":{"listChanged":true},"sampling":{},"elicitation":{"form":{},"url":{}},"tasks":{"list":{},"cancel":{},"requests":{"sampling":{"createMessage":{}},"elicitation":{"create":{}}}}},"clientInfo":{"name":"Visual Studio Code","version":"1.107.1"}}}
2025-12-23 17:33:41.648 [warning] [server stderr] Fcli MCP server running on stdio. Hit Ctrl-C to exit.
2025-12-23 17:33:41.650 [debug] [server -> editor] {"jsonrpc":"2.0","id":1,"error":{"code":-32603,"message":"Unrecognized field "form" (class io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation), not marked as ignorable (0 known properties: ])\n at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: io.modelcontextprotocol.spec.McpSchema$InitializeRequest["capabilities"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities["elicitation"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation["form"])","data":"IllegalArgumentException: Unrecognized field "form" (class io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation), not marked as ignorable (0 known properties: ])\n at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: io.modelcontextprotocol.spec.McpSchema$InitializeRequest["capabilities"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities["elicitation"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation["form"])\n Caused by: UnrecognizedPropertyException: Unrecognized field "form" (class io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation), not marked as ignorable (0 known properties: ])\n at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: io.modelcontextprotocol.spec.McpSchema$InitializeRequest["capabilities"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities["elicitation"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation["form"])"}}

[sathyatg3377]

After upgrading the fcli version unable to start the MCP from VS Code please find the below error

2025-12-24 18:24:43.744 [error] Error: MPC -32603: Unrecognized field "form" (class io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation), not marked as ignorable (0 known properties: ])
at [Source: UNKNOWN; byte offset: #UNKNOWN] (through reference chain: io.modelcontextprotocol.spec.McpSchema$InitializeRequest["capabilities"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities["elicitation"]->io.modelcontextprotocol.spec.McpSchema$ClientCapabilities$Elicitation["form"])
at O8i.O (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:2265:35574)
at O8i.L (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:2265:35369)
at Sce.value (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:2265:34358)
at E.C (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:29:2349)
at E.fire (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:29:2568)
at bMs.pushMessage (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:604:55563)
at gli.$onDidReceiveMessage (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:604:52099)
at YRt.S (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3894:40815)
at YRt.Q (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3894:40593)
at YRt.M (vscode-file://vscode-app/c:/Users/SathyaNarayanan/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3894:39681)

[rsenden]

@rian-gomes-keeggo Thanks for reporting, we'll try to reproduce this issue and provide you with an update.

@SangameshV Can you please try reproducing this issue and identify the root cause?

[rsenden]

@rian-gomes-keeggo, @sathyatg3377, can you plaase try again with the latest fcli v3.14.2 release? https://github.com/fortify/fcli/releases/tag/v3.14.2

[rian-gomes-keeggo]

The MCP server with Copilot integration is working correctly in fcli v3.14.2.

Tested version

fcli version 3.14.2, built on 2025-12-24 18:29:36

Observed behavior

The MCP server starts successfully

The VS Code extension connects

Copilot integration works as expected

All features are fully operational

Log message observed

Failed to set MCP server log level: Error: MPC -32603: Cannot deserialize value of type
io.modelcontextprotocol.spec.McpSchema$LoggingLevel from String "info":
not one of the values accepted for Enum class:
[EMERGENCY, DEBUG, NOTICE, ALERT, INFO, CRITICAL, ERROR, WARNING]

Impact

The error appears to be logging-level related only

It is likely caused by a case/enum mismatch ("info" vs "INFO")

No functional impact has been observed

The issue is cosmetic and does not interfere with the Copilot integration.

[rsenden]

@rian-gomes-keeggo Thanks for the feedback, good to hear that the integration is now working again. We'll check whether there's an easy fix for the case mismatch even though it doesn't seem to have any functional impact.