pnCore: Instructions file for Codex

AGENTS.md

pnCore AGENTS.md is an instructions file for Codex, OpenCode from perniemann/pnCore. It costs 2,945 tokens per session, scanned A, original, MIT.

An AGENTS.md instruction file that stores persistent notes for the pnCore workspace, including user preferences and facts learned from earlier work. AGENTS.md files guide coding agents while they work in a repository.

In plain words
What is it for?
Use it to preserve workspace-specific instructions and learned preferences across coding sessions.
Why use it?
It keeps important working rules in one place, such as commit-message requirements, server handling, planning preferences, and verification expectations.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions CLAUDE.md; mentions Claude Code; mentions AGENTS.md.

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

Reuse

Borrowing it

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

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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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 pnCore AGENTS.md

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<a href="https://agentmods.dev/instructions/perniemann/pncore/agents-md"><img src="https://agentmods.dev/badge/instructions/perniemann/pncore/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 2,945 This file is loaded in full into every session.
When invoked 2,945 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 $0.02945 $0.02945
Opus 5.5 $0.01178 $0.01178
Sonnet 5.5 $0.00589 $0.00589
Haiku 4.5 $0.00295 $0.00295

Measured 1mo ago against content hash d50406acacc7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pnCore 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 · 51 lines

How it starts

The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Persistent memory for this workspace. Updated from transcript deltas by pn-continual-learning.

Learned User Preferences

  • Never add trailer "Co-authored-by: Cursor [email protected]" or any "Made-with: Cursor" (or similar IDE) line to commits; never set Author or Committer to Cursor Agent / [email protected]
  • Contributors: run git config core.hooksPath .githooks so prepare-commit-msg strips trailer lines automatically (see docs/commits.md); workspace rule .cursor/rules/pn-no-cursor-commit-trailers.mdc (alwaysApply) covers trailers and authorship; canonical copy ships as MCP rule pn-no-cursor-commit-trailers for other projects (pn-setup / pn-new); CI no-ide-trailers fails on those identities too
  • Always terminate running servers before starting a new one
  • Avoid hedging: "possibly", "should", "could", "might" are not acceptable; use definitive statements
  • Prefer plans before implementation; implement plans as specified without editing the plan file
  • Commit when work is done; push only when the user explicitly asks
  • When user asks for verification, confirm everything works before claiming completion
  • On Windows PowerShell: use ; for command chaining (not &&); use Get-ChildItem -Force | Select-Object Mode,Name,Length instead of ls -la; use Test-Path + Get-Item .FullName to verify paths; use Where-Object and -match (case-insensitive by default) for filtering. Do not blindly translate Unix shell snippets — check the cmdlet first
  • When a /pn-* command is invoked but the user's actual request does not match that command's contract, state the mismatch in plain prose in the first response ("You invoked /X but the ask is Y; I'll re-route to Z unless you'd rather I run X as written") before re-routing. Silent re-routing is a RULE-MISS:acknowledge-command-mismatch per pn-build-gate § Command-contract acknowledgement; the [pn-command] ▲ start marker still applies during the re-route. Canonical rule: pn-build-gate § Command-contract acknowledgement

Read the full file on GitHub · 51 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. 1mo ago Changed · +4 lines · +564 tokens per session d50406acacc7
  2. 1mo ago Changed · +2 lines · +189 tokens per session df7fffdd2d08
  3. 1mo ago Changed · +1 lines · +197 tokens per session 57944cd9ef9b
  4. 1mo ago Changed · +1 lines · +55 tokens per session 711822c979c0
  5. 1mo ago First seen · 43 lines · 1,940 tokens per session scan A d50175577a64

Subscribe to this mod's changes

pnCore AGENTS.md is an instructions file published in the GitHub repository perniemann/pnCore (0 stars, last pushed 2d ago), licensed MIT. It adds 2,945 tokens to every session, about $0.0118 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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