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Surface: Instructions file for Codex

AGENTS.md

Surface AGENTS.md is an instructions file for Codex, OpenCode from Aaryan-Kapoor/Surface. It costs 1,440 tokens per session, scanned A, original, MIT.

Repository instructions for Surface, a local display system where AI agents send content through one shared command-line tool. They describe its server, browser app, data storage, service setup, migrations, and agent rules.

In plain words
What is it for?
Use them when developing, testing, building, installing, or troubleshooting the Surface server, client, command-line tool, stored data, or background service.
Why use it?
They give coding agents the project context and commands needed to make changes that fit the existing architecture.

Instructions file for CodexOpenCode

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

This is Aaryan-Kapoor/Surface's own configuration. It tells Codex and OpenCode how to work on Surface 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 Surface configures →

not rated 49repo 1mo ago A scan 1,440 tokens original MIT
View source ↗ Aaryan-Kapoor/Surface
Reuse

Borrowing it

Nothing to install: this file belongs to Aaryan-Kapoor/Surface. 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/Aaryan-Kapoor/Surface/master/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/Aaryan-Kapoor/Surface

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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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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<a href="https://agentmods.dev/instructions/aaryan-kapoor/surface/agents-md"><img src="https://agentmods.dev/badge/instructions/aaryan-kapoor/surface/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,440 This file is loaded in full into every session.
When invoked 1,440 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 $0.01440 $0.01440
Opus 5.5 $0.00576 $0.00576
Sonnet 5.5 $0.00288 $0.00288
Haiku 4.5 $0.00144 $0.00144

Measured 1mo ago against content hash 75f795d6427a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Surface 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 · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Surface

Universal display for AI agents. Agents push content via a single shared CLI (surface). Discovery is via SKILL.md at the repo root. Full per-feature docs: docs/README.md.

Stack

  • Server: Express 5 + SQLite (better-sqlite3) + SSE live updates. Routers per concern in server/routes/.
  • Client: Vanilla JS PWA, hash routing, sandboxed iframes via real routes. client/surface.js is the runtime injected into surface HTML.
  • CLI (bin/surface.ts): canonical agent client; bundled to dist/surface.mjs by npm run build (runs on install via prepare; also bundles the server to dist/server.mjs); the npm surface bin points at the bundle. Published as surface-display.
  • Data: ~/.surface/ (db.sqlite + artifacts/ + logs/ + templates/). Override with SURFACE_DATA_DIR.
  • Service: Surface should run once as a per-user supervised service bound to 127.0.0.1 — surface service install picks the native backend (systemd user unit / launchd agent / Windows Scheduled Task), health-gates the start, and logs to ~/.surface/logs/.
  • Migrations: SQLite PRAGMA user_version via server/migrations.ts; fresh-start baseline = v10. Pre-baseline DBs are archived to db.sqlite.bak at boot, never migrated.
  • Templates: built-ins in templates/ (ask, stream, video, board, doc); resolution project .surface/templates → ~/.surface/templates → built-in.
  • MCP (archived in archived/mcp.ts): not installed by default; needs npm i @modelcontextprotocol/sdk to run.

Commands

  • npm run dev — start server on 127.0.0.1:3000
  • npm run service — service entrypoint from source (production supervisors exec dist/server.mjs via surface service install)
  • npm run cli — invoke the CLI from source without npm link
  • npm run test:artifacts — HTTP regression suite (needs a running server; use an isolated SURFACE_DATA_DIR + PORT)
  • npm run test:auth — two-plane trust-model acceptance tests (spawns its own servers)
  • npm run test:startup-access — pairing URL/QR helpers
  • npx tsc --noEmit — TypeScript check

Read the full file on GitHub · 64 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 First seen · 64 lines · 1,440 tokens per session scan A 75f795d6427a

Subscribe to this mod's changes

Surface AGENTS.md is an instructions file published in the GitHub repository Aaryan-Kapoor/Surface (49 stars, last pushed 1mo ago), licensed MIT. It adds 1,440 tokens to every session, about $0.0058 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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