spar-kit: Instructions file for Codex

AGENTS.md

spar-kit AGENTS.md is an instructions file for Codex, OpenCode from Jed-Tech/spar-kit. It costs 197 tokens per session, scanned A, original, Apache-2.0.

Instructions for SPAR-kit, a workflow for helping AI agents specify a change, plan it, carry it out, and retain useful project memory. It uses repository tools, scripts, and tracked specifications.

In plain words
What is it for?
Use it when making multi-file, user-facing, or unclear changes in a SPAR-kit project, especially when the work needs a specification and later documentation.
Why use it?
It gives non-trivial changes a written source of truth and reduces work drifting away from the original intent. It also defines how to handle unclear or failed approaches.

Instructions file for CodexOpenCode

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

This is Jed-Tech/spar-kit's own configuration. It tells Codex and OpenCode how to work on spar-kit 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 spar-kit configures →

Reuse

Borrowing it

Nothing to install: this file belongs to Jed-Tech/spar-kit. 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/Jed-Tech/spar-kit/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/Jed-Tech/spar-kit

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.

agentmods badge for spar-kit AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/jed-tech/spar-kit/agents-md"><img src="https://agentmods.dev/badge/instructions/jed-tech/spar-kit/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.

agentmods 80×15 button for spar-kit AGENTS.md

Your own site · 80×15
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Per session 197 This file is loaded in full into every session.
When invoked 197 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 $0.00197 $0.00197
Opus 5.5 $0.00079 $0.00079
Sonnet 5.5 $0.00039 $0.00039
Haiku 4.5 $0.00020 $0.00020

Measured 1mo ago against content hash 54fbfbbf2f19, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

spar-kit 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 · 16 lines

What it actually says

Agent instructions

  • Be aware of tools in .spar-kit/.local/tools.yaml and commands in justfile/repo scripts (read them if not already in context). Use repo-defined tools and commands as the default approach.

SPAR workflow:

  • This repo uses the SPAR workflow for non-trivial changes.
  • Start with spar-specify for any multi-file, user-facing, or unclear change. When unsure, default to spar-specify.
  • SPAR work is tracked in specs/ (active/ and completed/).
  • SPAR is the source of truth for planning, execution, and documentation.
  • When an active spec is complete, suggest running spar-retain to finalize documentation.

Failure handling:

  • If an approach fails or is unclear, do not switch to a less ideal approach. Stop, explain the issue, offer options and ask before proceeding.
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 · 16 lines · 197 tokens per session scan A 54fbfbbf2f19

Subscribe to this mod's changes

spar-kit AGENTS.md is an instructions file published in the GitHub repository Jed-Tech/spar-kit (17 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 197 tokens to every session, about $0.0008 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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