Assistant: `getPlot` tool not working with GitHub Copilot models

[jonvanausdeln]

System details:

Positron and OS details:

Positron Version: 2025.12.0 (user setup) build 114 Code - OSS Version: 1.106.0 Commit: d49b1e96dfbb289f3982c5f861b75e442a1484dc Date: 2025-11-21T07:35:34.718Z Electron: 37.7.0 Chromium: 138.0.7204.251 Node.js: 22.20.0 V8: 13.8.258.32-electron.0 OS: Windows_NT x64 10.0.26200

Session details:

Github Copilot: Any model (claude, gpt)

Describe the issue:

Github Copilot model provider models can't use the getPlot tool any longer. I tried in all 3 modes (Ask/Edit/Agent)

This seems to have happened with the 1.106 upstream merge

Models from the Anthropic provider do work

Some examples:

GHCopilot -> Claude 4 Sonnet

Steps to reproduce the issue:

1. create a plot
2. Ask assistant about the plot

Expected or desired behavior:

It uses getPlot tool to see the plot and tell me about it.

Were there any error messages in the UI, Output panel, or Developer Tools console?

[sharon-wang]

I've split out the OpenAI part of this as I have a fix in flight. OpenAI-specific issue: https://github.com/posit-dev/positron/issues/10759