Vscode Extension on copilot chat, giving "invalid input" for editing files using copilot_replaceString tool #2749

roshinimichael · 2025-07-01T20:00:06Z

roshinimichael
Jul 1, 2025

I am developing a vscode extension using copilot chat, suing this extension sample: https://github.com/microsoft/vscode-extension-samples/blob/main/chat-sample/src/toolParticipant.ts

But editing files with this exetnsion, now gives the error : "invalid input" while invoking the tool.
I can see the copilot_replaceString tool is currently giving a stream.markdownString() output instead of directly editing the files now. How can I update my extension's invokeTool to handle this stream output for this copilot_replaceString tool?

This used to work until two months back. The latest changes in copilot_replaceString tool seem to have caused this.

Tool Name:  copilot_replaceString
extensionHostProcess.js:177
Tool Inputs:  {
  "filePath": "/Users/testuser/workspace/realworld/mongodb-demo-agent/articles_POST_smoke_test.py",
  "oldString": "test_articles_post",
  "newString": "test_articles_post_test"
}
extensionHostProcess.js:177
Tool Name: copilot_replaceString
extensionHostProcess.js:177
Tool Input: {"filePath":"/Users/testuser/workspace/realworld/mongodb-demo-agent/articles_POST_smoke_test.py","oldString":"test_articles_post","newString":"test_articles_post_test"}
extensionHostProcess.js:177
Tokenization Options: {tokenBudget: 1275, countTokens: ƒ}
extensionHostProcess.js:177
hd {a: false, b: null}
extensionHostProcess.js:177
Error occurred: Invalid input (at tsx element ToolUserPrompt > ToolCalls > Chunk > ToolResultElement)
extensionHostProcess.js:177
Error: Invalid input (at tsx element ToolUserPrompt > ToolCalls > Chunk > ToolResultElement)
    at SJ.invoke (/Users/roshinimichael/.vscode/extensions/github.copilot-chat-0.28.4/dist/extension.js:1415:2734)
    at Jq.$invokeTool (file:///Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:153:2696) {name: 'Error', message: 'Invalid input (at tsx element ToolUserPrompt > ToolCalls > Chunk > ToolResultElement)', stack: 'Error: Invalid input
    at SJ.invoke (/Users…ch/api/node/extensionHostProcess.js:153:2696)'}

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Vscode Extension on copilot chat, giving "invalid input" for editing files using copilot_replaceString tool #2749

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Vscode Extension on copilot chat, giving "invalid input" for editing files using copilot_replaceString tool #2749

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roshinimichael Jul 1, 2025

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roshinimichael
Jul 1, 2025