What is proxypin-mcp-workbench AGENTS.md?

Repository instructions for proxypin, a Flutter app with an HTTP(S) proxy built into the app. The proxy captures, changes, inspects, and saves network traffic for desktop and mobile interfaces.

Use them when working on proxy startup, TLS handling, request and response interception, traffic persistence, event delivery, or the desktop and mobile UI.

They explain the project’s architecture and interception rules so agents can modify network handling or the user interface without breaking the traffic pipeline.

How sinyu1012/proxypin-mcp-workbench configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to sinyu1012/proxypin-mcp-workbench. 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/sinyu1012/proxypin-mcp-workbench/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/sinyu1012/proxypin-mcp-workbench

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/sinyu1012/proxypin-mcp-workbench/agents-md/github.svg)](https://agentmods.dev/instructions/sinyu1012/proxypin-mcp-workbench/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/sinyu1012/proxypin-mcp-workbench/agents-md"><img src="https://agentmods.dev/badge/instructions/sinyu1012/proxypin-mcp-workbench/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/sinyu1012/proxypin-mcp-workbench/agents-md"><img src="https://agentmods.dev/badge/instructions/sinyu1012/proxypin-mcp-workbench/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 927 This file is loaded in full into every session.

When invoked 927 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	$0.00927	$0.00927
Opus 5	$0.00464	$0.00464
Sonnet 5	$0.00185	$0.00185
Haiku 4.5	$0.00093	$0.00093

Measured 9d ago against content hash 1a9af408fd94, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

proxypin-mcp-workbench 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 9d 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 · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

What This Project Is

proxypin is a Flutter app with an in-process HTTP(S) proxy core; UI and proxy run in the same app process (lib/main.dart, lib/network/bin/server.dart).
Primary value flows are capture -> mutate -> inspect -> persist traffic, with desktop/mobile UIs sharing the same proxy engine.

Architecture You Need First

Entry point chooses desktop vs mobile shells and optional multi-window mode (lib/main.dart).
Proxy server lifecycle is owned by ProxyServer (start/stop/restart, system proxy toggling, cert init) (lib/network/bin/server.dart).
Socket/channel pipeline lives in Server/Network; TLS MITM handshake and relay fallbacks happen in Server.ssl (lib/network/channel/network.dart).
HTTP request/response routing is centralized in HttpProxyChannelHandler and HttpResponseProxyHandler (lib/network/handle/http_proxy_handle.dart).
UI pages implement EventListener to receive onRequest/onResponse/onMessage events from proxy runtime (lib/ui/desktop/desktop.dart, lib/ui/mobile/mobile.dart, lib/network/bin/listener.dart).

Interceptor Model (Core Convention)

All traffic mutations use Interceptor hooks: preConnect, onRequest, execute, onResponse, onError (lib/network/components/interceptor.dart).
Interceptors are sorted by priority before registration; changing order changes behavior (lib/network/bin/server.dart).
Current chain includes hosts, request-map, rewrite, JS script, block, breakpoint, report-server (lib/network/bin/server.dart).
execute() can short-circuit remote calls by returning a synthetic HttpResponse (used by request mapping) (lib/network/components/request_map.dart).

Persistence + Config Patterns

Network/runtime config is JSON in app support/home paths (not in repo): config.cnf, request_rewrite.json, request_map.json, script.json (lib/network/bin/configuration.dart, lib/network/components/manager/*).
UI preferences are separate from proxy config (ui_config.json) (lib/ui/configuration.dart).
Captured traffic is persisted as HAR-like records via HistoryStorage and periodic HistoryTask flushes (lib/storage/histories.dart, lib/utils/har.dart).
Favorites intentionally trim websocket/SSE frame count and payload size before persistence (lib/storage/favorites.dart).

Read the full file on GitHub · 45 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.

9d ago First seen · 45 lines · 927 tokens per session scan A 1a9af408fd94

Subscribe to this mod's changes

proxypin-mcp-workbench AGENTS.md is an instructions file published in the GitHub repository sinyu1012/proxypin-mcp-workbench (46 stars, last pushed 16d ago), licensed Apache-2.0. It adds 927 tokens to every session, about $0.0046 per session on Opus 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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