Borrowing it
Nothing to install: this file belongs to ThiagoGuislotti/copilot-instructions. 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/ThiagoGuislotti/copilot-instructions/main/.github/instructions/security-vulnerabilities.instructions.mdgit clone --depth 1 https://github.com/ThiagoGuislotti/copilot-instructionsWrote 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/thiagoguislotti/copilot-instructions/security-vulnerabilities)<a href="https://agentmods.dev/instructions/thiagoguislotti/copilot-instructions/security-vulnerabilities"><img src="https://agentmods.dev/badge/instructions/thiagoguislotti/copilot-instructions/security-vulnerabilities/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/thiagoguislotti/copilot-instructions/security-vulnerabilities"><img src="https://agentmods.dev/badge/instructions/thiagoguislotti/copilot-instructions/security-vulnerabilities.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 | $0.01367 | $0.01367 |
| Opus 5.5 | $0.00547 | $0.00547 |
| Sonnet 5.5 | $0.00273 | $0.00273 |
| Haiku 4.5 | $0.00137 | $0.00137 |
Grade A, and why
copilot-instructions security-vulnerabilities.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 — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Security Standards Baseline
- Use this instruction for API, frontend, backend, and database security decisions.
- Prioritize prevention of OWASP Top 10 and API Top 10 classes of vulnerabilities.
- Treat this as a secure-by-default baseline, then add domain-specific controls as needed.
Current Reference Standards
- OWASP ASVS 5.0.0 as the application security verification baseline.
- OWASP API Security Top 10 2023 for API-specific threat classes.
- OWASP Top 10 2021 (v1.1 released July 13, 2025) for web application risk coverage.
- NIST SP 800-218 SSDF v1.1 for secure software development lifecycle practices.
- NIST SP 800-63B-4 for authentication and authenticator lifecycle controls.
- NIST SP 800-53 Rev 5 control families for governance alignment.
- CWE Top 25 current release for recurring weakness prioritization.
Cross-Layer Secure-by-Default Rules
- Enforce least privilege for identities, services, data access, and runtime permissions.
- Enforce deny-by-default authorization and explicit allow rules per action.
- Validate all untrusted input at trust boundaries and normalize before use.
- Encode output by context to prevent injection and data interpretation flaws.
- Keep secrets out of source code and logs; use managed secret stores and short-lived credentials.
- Encrypt sensitive data in transit and at rest with managed key rotation.
- Require structured audit logging with correlationId and immutable retention policy.
API Security Controls
- Enforce object-level and function-level authorization on every endpoint and resource ID.
- Use strong authentication with scoped tokens and explicit token audience validation.
- Validate request and response contracts with strict schemas; reject unknown or unsafe fields.
- Enforce rate limits, quotas, and abuse controls for sensitive business flows.
- Apply request size limits, timeout limits, pagination caps, and payload depth limits.
- Prevent SSRF with strict outbound allowlists, DNS rebinding defenses, and blocked link-local targets.
- Protect file upload endpoints with type validation, malware scanning, and storage isolation.
- Expose only required API versions and maintain a complete endpoint inventory.
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 First seen · 105 lines · 1,367 tokens per session scan A 8ca5dbf503a9
copilot-instructions security-vulnerabilities.instructions.md is an instructions file published in the GitHub repository ThiagoGuislotti/copilot-instructions (2 stars, last pushed 3mo ago), licensed MIT. It adds 1,367 tokens to every session, about $0.0055 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 2026-08-31.
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