What is promptbin AGENTS.md?

A set of repository instructions for PromptBin, an example MCP server distributed through PyPI. It describes the project structure, setup, coding conventions, and testing guidance.

Use it when developing, testing, or reviewing PromptBin, including its Flask web app, MCP server, file storage, sharing, and tunnel components.

It gives a coding agent the project-specific rules it needs to make changes that fit the existing codebase.

How ianphil/promptbin configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to ianphil/promptbin. 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/ianphil/promptbin/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/ianphil/promptbin

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/ianphil/promptbin/agents-md/github.svg)](https://agentmods.dev/instructions/ianphil/promptbin/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/ianphil/promptbin/agents-md"><img src="https://agentmods.dev/badge/instructions/ianphil/promptbin/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/ianphil/promptbin/agents-md"><img src="https://agentmods.dev/badge/instructions/ianphil/promptbin/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,040 This file is loaded in full into every session.

When invoked 1,040 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.

Model	Per session	Once invoked
Fable 5.1	$0.01040	$0.01040
Opus 5.5	$0.00416	$0.00416
Sonnet 5.5	$0.00208	$0.00208
Haiku 4.5	$0.00104	$0.00104

Measured 2mo ago against content hash 35d528686dbd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

promptbin 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 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.

AGENTS.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository Guidelines

PromptBin is an MCP server example designed for easy distribution and usage via PyPI.

Primary workflow: uv add promptbin && uv run promptbin

Project Structure & Module Organization

src/promptbin/app.py: Complete Flask web app with all routes, views, and lifecycle management.
src/promptbin/mcp/server.py: Full MCP server implementation with subprocess integration.
src/promptbin/managers/prompt_manager.py: File-based storage with search, categories, and metadata.
src/promptbin/managers/share_manager.py: Secure sharing logic with ephemeral tokens.
src/promptbin/managers/tunnel_manager.py: Microsoft Dev Tunnels integration with rate limiting and security.
src/promptbin/utils/setup_checker.py: System validation and diagnostic tool.
src/promptbin/utils/install_devtunnel.py: Cross-platform installer automation.
src/promptbin/web/templates/ and static/: HTMX-powered UI templates and assets.
~/promptbin-data/: Local JSON prompt data, organized by category (coding, writing, analysis).
TUNNELS.md: Comprehensive technical documentation for Dev Tunnels.
ai_docs/: Internal planning and development prompts (completed phases).

Build, Test, and Development Commands

Production usage (PyPI):

Install: uv add promptbin (requires Python 3.11+ and uv).
Run both MCP + web: uv run promptbin (primary use case).
Run MCP only: uv run promptbin --mcp (MCP server mode).
Run web only: uv run promptbin --web (standalone web mode).
Setup verification: uv run promptbin-setup (validates system readiness).
Install Dev Tunnels: uv run promptbin-install-tunnel (cross-platform installer).

Development (local):

Install deps: uv sync.
Run both MCP + web: uv run promptbin.
Run MCP only: uv run promptbin --mcp.
Run web only: uv run promptbin --web.
Lint/format: None enforced; see style section below.

Coding Style & Naming Conventions

Python style: PEP 8, 4‑space indents, descriptive names.
Types: prefer type hints for public functions and return values.
Modules: keep files focused (web in src/promptbin/app.py, protocol in src/promptbin/mcp/server.py, storage in src/promptbin/managers/prompt_manager.py).
IDs: prompt files named <id>.json under ~/promptbin-data/<category>/ (IDs generated like YYYYMMDD_HHMMSS_xxxxxxxx).
Categories: use one of coding, writing, analysis.

Read the full file on GitHub · 65 lines

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.

2mo ago First seen · 65 lines · 1,040 tokens per session scan A 35d528686dbd

Subscribe to this mod's changes

promptbin AGENTS.md is an instructions file published in the GitHub repository ianphil/promptbin (0 stars, last pushed 10mo ago), licensed MIT. It adds 1,040 tokens to every session, about $0.0042 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.

promptbin AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
promptbin AGENTS.mdianphil/promptbin	Instructions file	0	10mo ago	MIT	A	1,040	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	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

promptbin: Instructions file for Codex