What is extend-cli AGENTS.md?

A contributor guide for Extend CLI, a Go command-line program for Extend’s document-AI platform. It explains how commands use the Extend software library and how the repository is divided into command, API, login, integration-test, and evaluation code.

Building, testing, reviewing, formatting, and extending the Extend command-line tool and its authentication and API integrations.

It separates fast local tests from integration tests that need service credentials and may spend usage credits. It also tells contributors where each kind of code belongs and which checks must pass.

How extend-hq/extend-cli configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to extend-hq/extend-cli. 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/extend-hq/extend-cli/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/extend-hq/extend-cli

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/extend-hq/extend-cli/agents-md/github.svg)](https://agentmods.dev/instructions/extend-hq/extend-cli/agents-md)

Your own site

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

Per session 582 This file is loaded in full into every session.

When invoked 582 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	$0.00582	$0.00582
Opus 5.5	$0.00233	$0.00233
Sonnet 5.5	$0.00116	$0.00116
Haiku 4.5	$0.00058	$0.00058

Measured 2mo ago against content hash c3a5184615cd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

extend-cli 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 · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

extend is a Go CLI for the Extend document AI platform. Entrypoint: cmd/extend. Every command is built on the Extend Go SDK (github.com/extend-hq/extend-go-sdk) wired through internal/extendx.

Build & test

go build ./...
go test ./...        # unit tests; no network, fast
go vet ./...
gofmt -l cmd internal # must print nothing

Integration tests are a separate module under test/integration (black-box: they build and exec the binary). They need EXTEND_BASE_URL and EXTEND_API_KEY and skip silently without them; run-creating ops that spend credits are gated behind EXTEND_TEST_RUN_OPS=1:

cd test/integration && go test ./...

Skill evals (drive real Claude Code / Codex harnesses) are another module under evals/runner; see evals/README.md.

Layout

cmd/extend — main entrypoint.
internal/cli — every command, group, and help topic; the typed CommandDoc tree is the source of truth (see internal/cli/AGENTS.md).
internal/extendx — SDK client construction, run polling/wait, file I/O.
internal/oauth: browser login (PKCE flow, loopback redirect, token storage in the keychain with file fallback, silent refresh).
internal/output, internal/iostreams — rendering and stream handling.
evals/ — skill-eval harness (see evals/AGENTS.md).

Conventions

A command's --help and the generated SKILL.md are projections of the CommandDoc tree — change the doc, never hand-edit generated skill output.
Never commit secrets or API keys.

Keep the scoped AGENTS.md files current

Subtrees with their own contracts carry a local AGENTS.md that is the source of truth for their area. When a change touches that area, update its AGENTS.md in the same change — drift is a defect, not a follow-up:

internal/cli/AGENTS.md — the CommandDoc documentation contract: how every command, group, and help topic is declared, the required fields per node kind, and the validators that enforce them.
evals/AGENTS.md — the skill-eval authoring contract: the case schema and Path A/B split, expectation types, stub modes and per-command help, and ID-fabrication patterns.

Read the full file on GitHub · 55 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.

2mo ago First seen · 55 lines · 582 tokens per session scan A c3a5184615cd

Subscribe to this mod's changes

extend-cli AGENTS.md is an instructions file published in the GitHub repository extend-hq/extend-cli (51 stars, last pushed today), licensed MIT. It adds 582 tokens to every session, about $0.0023 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.

extend-cli AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
extend-cli AGENTS.mdextend-hq/extend-cli	Instructions file	51	today	MIT	A	582	Codex, OpenCode
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extend-cli: Instructions file for Codex