digital-twins: Instructions file for Codex

AGENTS.md

digital-twins AGENTS.md is an instructions file for Codex, OpenCode from pome-sh/digital-twins. It costs 2,928 tokens per session, scanned A, original, Apache-2.0.

Repository instructions for a project that creates local, resettable copies of real APIs so agents can test REST, GraphQL, and MCP interactions with recorded traces.

In plain words
What is it for?
Use them when developing or testing API twins, running agent tasks, recording traces, or working on the command-line interface and shared packages.
Why use it?
They explain where the command-line tool, API copies, recording code, tasks, and checks live, reducing the risk of changing the wrong part of the system.

Instructions file for CodexOpenCode

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

This is pome-sh/digital-twins's own configuration. It tells Codex and OpenCode how to work on digital-twins 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 digital-twins configures →

Reuse

Borrowing it

Nothing to install: this file belongs to pome-sh/digital-twins. 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/pome-sh/digital-twins/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/pome-sh/digital-twins

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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README.md
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Per session 2,928 This file is loaded in full into every session.
When invoked 2,928 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 $0.02928 $0.02928
Opus 5.5 $0.01171 $0.01171
Sonnet 5.5 $0.00586 $0.00586
Haiku 4.5 $0.00293 $0.00293

Measured 15d ago against content hash 48cff451c74b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

digital-twins 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 15d 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 · 228 lines

How it starts

The opening of the file, as written. The whole thing — 228 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Intro

Open-sourced Digital Twins of APIs and the pome CLI.

A digital twin is a local, resettable emulation of a real API that answers the same REST, GraphQL and MCP calls your agent makes in production, backed by real SQLite state. The CLI boots a twin, runs an agent against it, and records the trace.

Recording is open source. Evaluation and scoring are hosted: pome run --local records a trace. Apache-2.0.

Layout

cli/                  the `pome` CLI
  src/cli/            command modules; main.ts is the Commander tree and keeps
                      a few small commands inline
  src/runner/         boots twins, runs the agent, writes artifacts
  src/recorder/       trace capture and redaction
  src/hosted/         control-plane client
  src/task/           task file parsing
  tasks/              the bundled task library `pome tasks` serves
packages/
  twin-{github,gmail,linear,slack,stripe}/
  twin-telegram/      a standalone twin, not yet mounted by the CLI
  dashboard/          the live tape page `pome twin start` serves
  sdk/                the HTTP + MCP server every twin mounts, route input
                      declaration, seed loading; check DSL source
  wire/               event and trace types crossing a process boundary
  checks/             published re-export of that DSL and the twins'
                      check declarations (pome-cloud)
  sandbox-domains/    the same twins with no server — domain object, SQLite
                      opener, seed parser, for reading state in-process
contract/             cross-package tests against a booted twin
scripts/              build and CI gates
skills/               Claude skills shipped as a plugin
agent-examples/       runnable AGENTS for Pome to grade, each with its own install
integration-examples/ harnesses that DRIVE Pome from another eval platform

Commands

npm test                     # every vitest test in the repo, one process
npm run typecheck            # every workspace
npm run build                # every workspace, dependency-ordered
npm run test:contract        # contract/ suite; builds wire, sdk and the twins itself
npm run test:pack            # packs cli, checks, sandbox-domains; installs them clean
npm run gate:examples        # typechecks + tests every example, own install
npm run smoke:examples       # launches every example for real
npm run lint:dead-code       # knip
npm run lint                 # every lint rule, one runner
npm run lint -- <rule>       # one rule, for local iteration
npm run lint -- --list       # what rules exist
npm run lint:test            # each rule's case table
npm run probe:twins          # every declared endpoint answers

Read the full file on GitHub · 228 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. 15d ago Changed · +10 lines · +216 tokens per session 48cff451c74b
  2. 1mo ago Changed · +1 lines · +12 tokens per session 8af0debd5dee
  3. 1mo ago Changed · +3 lines · +50 tokens per session 5a4bac09b212
  4. 1mo ago Changed · -1 lines · -25 tokens per session b6d319392429
  5. 2mo ago First seen · 215 lines · 2,675 tokens per session scan A d38babc795b0

Subscribe to this mod's changes

digital-twins AGENTS.md is an instructions file published in the GitHub repository pome-sh/digital-twins (20 stars, last pushed 13d ago), licensed Apache-2.0. It adds 2,928 tokens to every session, about $0.0117 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.

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