silo: Instructions file for Codex

AGENTS.md

silo AGENTS.md is an instructions file for Codex, OpenCode from silo-code/silo. It costs 4,900 tokens per session, scanned A, original, MIT.

Project instructions for coding agents working on Silo, an open-source desktop app that lets developers keep multiple coding workspaces open and switch between them.

In plain words
What is it for?
Use them when changing Silo, planning substantial work, recording architecture decisions, updating project documents, or maintaining its glossary of domain terms.
Why use it?
They help an agent understand the project’s architecture, engineering rules, documentation practices, and plans for larger changes. They also reduce the risk of code and documentation falling out of sync.

Instructions file for CodexOpenCode

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

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

Reuse

Borrowing it

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

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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README.md
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Per session 4,900 This file is loaded in full into every session.
When invoked 4,900 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 $0.04900 $0.04900
Opus 5.5 $0.01960 $0.01960
Sonnet 5.5 $0.00980 $0.00980
Haiku 4.5 $0.00490 $0.00490

Measured 25d ago against content hash 11d41c14c94f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

silo 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 25d 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 · 345 lines

How it starts

The opening of the file, as written. The whole thing — 345 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Silo — project guide for coding agents

Silo keeps all your projects alive at once — for developers juggling coding agents (Tauri + React + TypeScript). Open many workspaces and switch instantly; each keeps its terminals, agents, panels, and layout intact in the background. 100% open source, free forever. Extensible: modeled on VS Code / Obsidian with a small stable core, a public extension SDK, and first-party features built as extensions — so the bar for boundaries, documentation, and a clean public surface is high.

Product positioning for humans lives in README.md / apps/docs/index.md / context7.json. Prefer those over inventing a tagline. This file is agent orientation (architecture, boundaries, commands), not marketing copy.

Orientation docs (read when relevant):

  • docs/architecture.md — the structural map: packages and their dependency edges, layering inside the host, the Rust/webview process split, persistence destinations, and the two published surfaces. Facts-only and drift-checked; start here when you don't yet know where something lives. The rules for staying inside those boundaries are below, under "Architecture boundaries".
  • docs/architecture-review-workflow.md — how a change gets an architectural review end to end: the silo-architecture-review skill, spot-checking its findings, and the author → reviewer → fixer session split.
  • docs/decisions/ — ADRs: the architecture decisions of record (the durable "why").
  • docs/proposals/ — RFCs: forward-looking designs not yet decided.
  • docs/change-planning-convention.md — how a substantial change is planned: proposal → (temporary) planning package → implementation → verification → collapse back to one durable proposal. See "Planning a substantial change" below.
  • docs/domain-language.md — the domain glossary: ubiquitous language for the product, including UI component naming (Panels & Docking, Navigator, …). Kept current via the workflow in .agents/skills/silo-domain-modeling/SKILL.md.
  • docs/silo-extensions-repo.md — the external silo-code/silo-extensions repo (cloned at ../silo-extensions): how its third-party extensions relate to this repo — published-SDK lag, npm (not pnpm) build commands, runtime trust / silo.permissions, and how to install a branch without merging. They publish into the registry; discovery is Browse / extensions.getsilo.dev, not cloning that repo.
  • docs/extensions-registry-repo.md — the external silo-code/extensions-registry repo (cloned at ../extensions-registry): git-backed catalog behind extensions.getsilo.dev (humans) and registry.getsilo.dev (app/CLI index). How it relates to in-app Browse / install / update in this monorepo.
  • apps/docs/guide/extension-checklist.md — pre-flight checklist for any extension (bundled or third-party): boundaries, permissions, styling, lifecycle, packaging, stability.

Read the full file on GitHub · 345 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. 25d ago Changed · +9 lines · +114 tokens per session 11d41c14c94f
  2. 1mo ago Changed · +38 lines · +532 tokens per session ae4b03ccbbd4
  3. 1mo ago Changed · +3 lines · +50 tokens per session 982bbdfbefdd
  4. 1mo ago First seen · 295 lines · 4,204 tokens per session scan A 1f57f44d2b18

Subscribe to this mod's changes

silo AGENTS.md is an instructions file published in the GitHub repository silo-code/silo (62 stars, last pushed yesterday), licensed MIT. It adds 4,900 tokens to every session, about $0.0196 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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