What is sidecar AGENTS.md?

A short set of coding-agent instructions for the Sidecar repository. It favors simplifying rewrites, requires explicit permission for backward compatibility, and notes that some user-facing text is embedded in an image.

Making code changes in Sidecar, deciding when a rewrite is appropriate, avoiding unrequested compatibility work, and refreshing the social-preview image after changing the install command, tagline, or color palette.

It prevents contributors from preserving old interfaces or forgetting to refresh generated branding after changing visible product details. It also points to the skill that handles those asset updates.

How anteprojector/sidecar configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to anteprojector/sidecar. 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/anteprojector/sidecar/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/anteprojector/sidecar

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/anteprojector/sidecar/agents-md/github.svg)](https://agentmods.dev/instructions/anteprojector/sidecar/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/anteprojector/sidecar/agents-md"><img src="https://agentmods.dev/badge/instructions/anteprojector/sidecar/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/anteprojector/sidecar/agents-md"><img src="https://agentmods.dev/badge/instructions/anteprojector/sidecar/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 89 This file is loaded in full into every session.

When invoked 89 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.

Model	Per session	Once invoked
Fable 5.1	$0.00089	$0.00089
Opus 5.5	$0.00036	$0.00036
Sonnet 5.5	$0.00018	$0.00018
Haiku 4.5	$0.00009	$0.00009

Measured 2mo ago against content hash f991b9123a25, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sidecar 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 · 12 lines

What it actually says

Agent Instructions

Be aggressive with rewrites when they make the system simpler or more coherent.

Do not add backwards compatibility unless explicitly instructed.

Do not run integration tests unless explicitly requested by the user.

Some user-facing copy is baked into images (site/assets/og.png). After changing the install command, tagline, or palette, re-render the generated assets — see .claude/skills/refresh-brand-assets/SKILL.md.

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.

2mo ago Changed · +2 lines · +12 tokens per session f991b9123a25
2mo ago First seen · 10 lines · 77 tokens per session scan A 75bffb43bce1

Subscribe to this mod's changes

sidecar AGENTS.md is an instructions file published in the GitHub repository anteprojector/sidecar (5 stars, last pushed 2mo ago), licensed MIT. It adds 89 tokens to every session, about $0.0004 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.

Git and workflow ai-agents cli developer-tools git-worktree sync

sidecar AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
sidecar AGENTS.mdanteprojector/sidecar	Instructions file	5	2mo ago	MIT	A	89	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

sidecar: Instructions file for Codex