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pasteguard: Instructions file for Codex

AGENTS.md

pasteguard AGENTS.md is an instructions file for Codex, OpenCode from sgasser/pasteguard. It costs 456 tokens per session, scanned A, original, Apache-2.0.

Project instructions for PasteGuard, a Bun and Hono privacy proxy for language-model requests. It masks personal information and secrets before forwarding requests, then restores placeholders in supported responses.

In plain words
What is it for?
Use it when developing or maintaining PasteGuard, especially its request masking, provider forwarding, logging, configuration, and public health or information endpoints.
Why use it?
It provides the project’s stack, endpoints, testing commands, and safety rules so changes follow its existing design and protect sensitive data.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions Codex.

This is sgasser/pasteguard's own configuration. It tells Codex and OpenCode how to work on pasteguard itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything pasteguard configures →

not rated 773repo +6 14d ago A scan 456 tokens original Apache-2.0
View source ↗ sgasser/pasteguard pasteguard.com
Reuse

Borrowing it

Nothing to install: this file belongs to sgasser/pasteguard. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/sgasser/pasteguard/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/sgasser/pasteguard

Made for: Codex, OpenCode.

Wrote 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.

agentmods badge for pasteguard AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/sgasser/pasteguard/agents-md/github.svg)](https://agentmods.dev/instructions/sgasser/pasteguard/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/sgasser/pasteguard/agents-md"><img src="https://agentmods.dev/badge/instructions/sgasser/pasteguard/agents-md/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.

agentmods 80×15 button for pasteguard AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/sgasser/pasteguard/agents-md"><img src="https://agentmods.dev/badge/instructions/sgasser/pasteguard/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 456 This file is loaded in full into every session.
When invoked 456 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00456 $0.00456
Opus 5.5 $0.00182 $0.00182
Sonnet 5.5 $0.00091 $0.00091
Haiku 4.5 $0.00046 $0.00046

Measured 1mo ago against content hash 41cf13336760, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pasteguard AGENTS.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.

AGENTS.md · 53 lines

What it actually says

PasteGuard Agent Instructions

Project

PasteGuard is a Bun/Hono privacy proxy for LLMs. It masks PII and secrets before forwarding requests to configured providers, then restores placeholders in responses where supported.

Primary endpoints:

  • POST /openai/v1/chat/completions
  • POST /anthropic/v1/messages
  • POST /codex/responses
  • GET /health
  • GET /info

Stack

  • Runtime: Bun
  • Web framework: Hono
  • Validation: Zod
  • Styling: Tailwind CSS v4
  • Database: SQLite at data/pasteguard.db
  • PII detection: GLiNER + regex/checksum detector service (detector/) exposing /analyze
  • Formatting/linting: Biome

Commands

  • bun run dev - development server
  • bun run start - production server
  • bun run build - build to dist/
  • bun test - test suite
  • bun run typecheck - TypeScript check
  • bun run check - Biome lint and format check
  • bun run format - apply Biome formatting for src/

Workflow

  • Prefer existing route/provider/extractor patterns over new abstractions.
  • Add or update tests when changing masking, provider forwarding, logging, config parsing, or public endpoints.
  • Run bun test, bun run typecheck, and bun run check before handing off code changes.
  • Update README and docs when public endpoints, provider config, or user setup steps change.
  • Do not commit tracked config.yaml changes.
  • Do not create commits or push branches unless the user explicitly asks.

Architecture Pointers

  • src/index.ts mounts routes and prints startup provider info.
  • src/config.ts owns YAML config loading and defaults.
  • src/routes/ contains HTTP route handlers.
  • src/providers/ contains provider clients and stream transformers.
  • src/masking/extractors/ contains provider-specific text extraction and insertion.
  • src/logging/logger.ts owns SQLite dashboard logging.
  • docs/mint.json registers API reference docs.
Changes

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.

  1. 1mo ago First seen · 53 lines · 456 tokens per session scan A 41cf13336760

Subscribe to this mod's changes

pasteguard AGENTS.md is an instructions file published in the GitHub repository sgasser/pasteguard (773 stars, last pushed 14d ago), licensed Apache-2.0. It adds 456 tokens to every session, about $0.0018 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.

LLMSecurityanthropicclaudeopenaipiiprivacy
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