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portmap: Instructions file for Codex

AGENTS.md

portmap AGENTS.md is an instructions file for Codex, OpenCode from paladini/portmap. It costs 698 tokens per session, scanned A, original, MIT.

A set of project instructions for working on portmap, a tool that maps local development services, ports, and localhost URL references.

In plain words
What is it for?
Use it when changing portmap code, building it, running its tests, or understanding its CLI and read-only MCP server.
Why use it?
It gives coding agents the project's layout, build and test commands, and required conventions in one place.

Instructions file for CodexOpenCode

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

This is paladini/portmap's own configuration. It tells Codex and OpenCode how to work on portmap 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 portmap configures →

not rated 0repo 2mo ago A scan 698 tokens original MIT
View source ↗ paladini/portmap
Reuse

Borrowing it

Nothing to install: this file belongs to paladini/portmap. 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/paladini/portmap/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/paladini/portmap

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.

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README.md
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Your own site
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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.

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Your own site · 80×15
<a href="https://agentmods.dev/instructions/paladini/portmap/agents-md"><img src="https://agentmods.dev/badge/instructions/paladini/portmap/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 698 This file is loaded in full into every session.
When invoked 698 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 $0.00698 $0.00698
Opus 5.5 $0.00279 $0.00279
Sonnet 5.5 $0.00140 $0.00140
Haiku 4.5 $0.00070 $0.00070

Measured 2mo ago against content hash 61cc024e9570, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

portmap 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.

Agent Guide — portmap

What this is

A deterministic CLI + MCP server that maps local dev topology for AI agents: declared ports (configs), runtime listeners (OS), and env URL references.

It does not start/stop processes, kill ports, or call an LLM. It reads the filesystem and OS socket table, then emits .portmap.json and actionable findings (PRT-01 … PRT-07).

Repo: https://github.com/paladini/portmap

Layout

  • src/cli.ts — CLI entry (portmap bin → dist/cli.js)
  • src/discover/static.ts — declared ports from configs
  • src/discover/runtime.ts — OS listeners (Windows + Unix)
  • src/discover/reconcile.ts — merge static + runtime + findings
  • src/discover/workspace.ts — multi-repo workspace scan
  • src/parsers/ — env, vite, package.json, docker-compose
  • src/mcp/server.ts — read-only MCP (4 tools)
  • src/format/output.ts — text, JSON, Markdown formatters
  • fixtures/ — mismatch, full-stack, frontend-only, workspace
  • docs/FINDINGS.md — full rule catalog
  • docs/SCHEMA.md — .portmap.json spec
  • docs/EXAMPLES.md — before/after fixes from fixtures

Build & test

npm ci
npm run build
npm test
npm run demo:mismatch   # expect PRT-01, PRT-04 findings
npm run demo:full-stack # multiple declared services
npm run demo:workspace  # cross-project env resolution

All tests must pass before commit.

Non-negotiable conventions

  • Deterministic only — no LLM, no network calls in the scan path.
  • Finding IDs are public API — never renumber (PRT-01, …).
  • Prefer false negatives over noisy false positives.
  • Read-only v1 — no start/stop/kill (Switchboard/PortPilot own lifecycle).
  • When adding a rule: update docs/FINDINGS.md, README, skills, and tests.

When agents need port context

  1. Run portmap scan . (or portmap declare . if nothing is running).
  2. Read references[] for correct localhost URLs — never guess :3000.
  3. Fix findings: PRT-04 (broken env URL) before debugging API connectivity.
  4. Use MCP tools portmap_graph / portmap_resolve_url when configured.
  5. Never re-implement topology discovery with an LLM — trust CLI output.

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.

  1. 2mo ago First seen · 65 lines · 698 tokens per session scan A 61cc024e9570

Subscribe to this mod's changes

portmap AGENTS.md is an instructions file published in the GitHub repository paladini/portmap (0 stars, last pushed 2mo ago), licensed MIT. It adds 698 tokens to every session, about $0.0028 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.

ai-agentsclideveloper-toolslocalhostmcpstatic-analysis
Related

portmap AGENTS.md compared with instructions from other repositories

portmap AGENTS.md next to 6 instructions from other repositories
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portmap AGENTS.mdpaladini/portmapInstructions file02mo agoMITA698Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143kyesterdayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode