Build a Claude Code mod without writing code

One prompt produced an always-visible context-window bar; Claude wrote, validated and hot-reloaded the mod.

by Pawel3 Oct 2026

Prompt for your agent

Goal: Show my context window fill level above the prompt at all times.
Setup: agents used in source: Claude; tools/MCPs stated: Claude Code mods.
Steps:
1. Ask Claude to write a Claude Code mod (a JS/TS module in a plugin) for it.
2. Have it validate and hot-reload the mod.
Rules: ask me before anything irreversible (sending, posting, paying, deleting); don’t invent data, results or tools I haven’t given you; tell me what you couldn’t verify.
Based on: Pawel — https://dev.to/pawel_nowak/i-built-my-first-claude-code-mod-without-writing-code-claude-wrote-it-validated-it-and-2mh7

Steps are from the source. Includes a “Based on” credit line.

I tried this

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Agents, models and tools only what the source states

Agents
Claude
Tools
  • Claude Code mods

Sources & credit