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Why is my VS Code extension activation event not firing when I open a markdown file and how do I debug the extension host process

ChatGPTgpt-62 queries10/31/2026
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The searches the AI actually ran for this prompt.

SEED QUERY
Why is my VS Code extension activation event not firing when I open a markdown file and how do I debug the extension host process
2 real searches · 1 real-search pass
site:code.visualstudio.com/api/references/activation-events onLanguage markdown activation events VS CodeGoogle ↗
OBSERVED
site:code.visualstudio.com/api/working-with-extensions debugging extension host process Extension Development HostGoogle ↗
OBSERVED

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Classifying 2 queries…

Searches and sources

ChatGPT2 real searches · gpt-6
site:code.visualstudio.com/api/references/activation-events onLanguage markdown activation events VS Code Google ↗
site:code.visualstudio.com/api/working-with-extensions debugging extension host process Extension Development Host Google ↗
  1. Remote Development Tips and Tricks · code.visualstudio.com
  2. November 2017 (version 1.19) · code.visualstudio.com
  3. Extension Host · code.visualstudio.com
  4. Your First Extension · code.visualstudio.com
  5. Extension Anatomy · code.visualstudio.com

Queries

2 queries · click a column to sort
Query / typeSearchIntentQuery classRouting formatClusterFreq ↓Weight
site:code.visualstudio.com/api/references/activation-events onLanguage markdown activation events VS Code
OBSERVED
Google ↗
AI Mode ↗
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of 1
site:code.visualstudio.com/api/working-with-extensions debugging extension host process Extension Development Host
OBSERVED
Google ↗
AI Mode ↗
————1x
of 1