Peacock is a Visual Studio Code extension that changes a workspace’s color so users can distinguish between multiple editor windows or shared and remote sessions. It is for developers who need a quick visual way to identify their VS Code workspaces. Its catalogue entries provide instructions and an MCP integration related to the extension.
Borrowing it
Nothing to install: this file belongs to johnpapa/vscode-peacock. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/johnpapa/vscode-peacock/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/johnpapa/vscode-peacockWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/johnpapa/vscode-peacock/copilot-instructions)<a href="https://agentmods.dev/instructions/johnpapa/vscode-peacock/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/johnpapa/vscode-peacock/copilot-instructions/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/johnpapa/vscode-peacock/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/johnpapa/vscode-peacock/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00931 | $0.00931 |
| Opus 5.5 | $0.00372 | $0.00372 |
| Sonnet 5.5 | $0.00186 | $0.00186 |
| Haiku 4.5 | $0.00093 | $0.00093 |
Grade A, and why
vscode-peacock copilot-instructions.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copilot Instructions — Peacock
Project Type
VS Code extension written in TypeScript, bundled with Webpack, published to the VS Code Marketplace.
TypeScript Conventions
- Strict mode enabled (
tsconfig.json) - Use explicit types for function parameters and return values
- Use
import typefor type-only imports - All source code lives in
src/
VS Code Extension Patterns
- Use
vscode.commands.registerCommand()for command registration - Use
vscode.workspace.getConfiguration('peacock')for reading settings - Use
vscode.window.showQuickPick()andvscode.window.showInputBox()for user input - All commands must be declared in
package.jsonundercontributes.commands - All settings must be declared in
package.jsonundercontributes.configuration.properties
Color Handling
- All color manipulation uses
tinycolor2via the helpers insrc/color-library.ts - Never manipulate hex strings directly — always go through the color library
- Colors are stored as hex strings (e.g.,
#ff0000) in VS Code configuration
Test Conventions
- Unit tests: Mocha + Sinon, located in
src/test/ - E2E tests: Playwright, located in
e2e/(primarily for docs screenshots) - Run unit tests:
npm test - Run e2e tests:
npm run test:e2e - Tests use
testworkspace/as the VS Code workspace - Every bug fix must include a regression test that fails without the fix and passes with it
- Every new feature must include unit tests covering the happy path and relevant edge cases
- Don't accept "this can't be tested" claims at face value. Grep
src/test/for the exactvscodeAPI/state the change depends on — if any existing suite already stubs it (host lane cansinon.stub(vscode.env, ...)), reuse that lane/pattern instead of skipping the test. See PR #757 for a worked example.
Code Style
- ESLint + Prettier (config in
.eslintrcand.prettierrc.js) - Husky pre-commit hook runs Prettier automatically
- Lint:
npm run lint - Fix:
npm run lint-fix
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed · +1 lines · +80 tokens per session d40b97ec5924
- 2mo ago First seen · 59 lines · 851 tokens per session scan A 81bc238f0548
vscode-peacock copilot-instructions.md is an instructions file published in the GitHub repository johnpapa/vscode-peacock (1,192 stars, last pushed 7d ago), licensed MIT. It adds 931 tokens to every session, about $0.0037 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
vscode-peacock copilot-instructions.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| vscode-peacock copilot-instructions.mdjohnpapa/vscode-peacock | Instructions file | 1.2k | 7d ago | MIT | A | 931 | GitHub Copilot |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |