Borrowing it
Nothing to install: this file belongs to gadicc/yahoo-finance2. 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/gadicc/yahoo-finance2/dev/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/gadicc/yahoo-finance2Wrote 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/gadicc/yahoo-finance2/copilot-instructions)<a href="https://agentmods.dev/instructions/gadicc/yahoo-finance2/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/gadicc/yahoo-finance2/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/gadicc/yahoo-finance2/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/gadicc/yahoo-finance2/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 | $0.02752 | $0.02752 |
| Opus 5.5 | $0.01101 | $0.01101 |
| Sonnet 5.5 | $0.00550 | $0.00550 |
| Haiku 4.5 | $0.00275 | $0.00275 |
Grade A, and why
yahoo-finance2 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 2mo 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 — 322 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Yahoo Finance 2 Development Instructions
Yahoo Finance 2 is a TypeScript/Deno library that provides programmatic access to Yahoo Finance data. It runs on Deno for development but also builds to NPM packages for distribution. The library includes modules for stock quotes, historical data, financial summaries, search, and more.
Always reference these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the info here.
Working Effectively
Environment Setup
- Environment is automatically configured via
.github/workflows/copilot-setup-steps.yml - Deno v2.x runtime installed with caching enabled
- Dependencies pre-installed with optimized caching
- Node.js v22 with npm/npx caching configured
- No manual TLS CA store configuration needed
Optimized Development Process
- Dependencies: install in ~30-60 seconds
- Build process: NPM build completes in ~1 minute
- Test execution: Test suite runs in ~1-2 minutes with caching optimizations
Core Development Commands
- View available tasks:
deno task - Run tests:
deno task test - Build NPM package:
deno task build:npm - Generate schemas:
deno task schema - Run CLI tool:
deno task cli <module> <args> - Lint code:
deno lint - Format code:
deno fmt
Development Workflow
- ALWAYS run schema generation after changing TypeScript interfaces:
deno task schema - ALWAYS run
deno fmtanddeno lintbefore committing changes - Use
--no-lockflag if encountering lockfile issues during development - HTTP requests are cached in
tests/fixtures/http(~450k lines of test data) - delete relevant files to refresh test data - When adding new modules, follow the pattern:
.tsfile with@yf-schemacomment +.test.ts+ schema generation
Validation
Manual Testing Scenarios
After making code changes, ALWAYS test the following scenarios to validate functionality:
CLI Testing (requires network access)
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.
- 2mo ago First seen · 322 lines · 2,752 tokens per session scan A eb6327bfcf3f
yahoo-finance2 copilot-instructions.md is an instructions file published in the GitHub repository gadicc/yahoo-finance2 (810 stars, last pushed yesterday), licensed MIT. It adds 2,752 tokens to every session, about $0.0110 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.
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