What is deciduous AGENTS.md?

Project instructions for working on a codebase that uses OpenCode, a coding-agent tool, and Deciduous, a tool for recording decisions and outcomes as a graph.

Use them when contributing to this project, especially for mapping current decisions with /pulse or exploring their history with /narratives and /archaeology.

They give an agent the project’s working rules and explain where to look when it needs to understand the current design or how that design evolved.

How notactuallytreyanastasio/deciduous configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to notactuallytreyanastasio/deciduous. 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/notactuallytreyanastasio/deciduous/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/notactuallytreyanastasio/deciduous

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/notactuallytreyanastasio/deciduous/agents-md/github.svg)](https://agentmods.dev/instructions/notactuallytreyanastasio/deciduous/agents-md)

Your own site

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

Per session 7,120 This file is loaded in full into every session.

When invoked 7,120 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	$0.07120	$0.07120
Opus 5.5	$0.02848	$0.02848
Sonnet 5.5	$0.01424	$0.01424
Haiku 4.5	$0.00712	$0.00712

Measured 1mo ago against content hash 4ada71bc3fa0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

deciduous 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

deciduous CLAUDE.md — 95% identical, 334 lines differ

AGENTS.md · 863 lines

How it starts

The opening of the file, as written. The whole thing — 863 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project Instructions for OpenCode

This file was converted from CLAUDE.md. OpenCode uses AGENTS.md for project instructions. See: https://opencode.ai/docs/rules/

Deciduous - Decision Graph Tooling

Decision graph tooling for AI-assisted development. Track every goal, decision, and outcome. Survive context loss. Query your reasoning.

The Two Modes

Every system has two stories:

Mode	Question	Skill
Now	"How does this work?"	`/pulse`
History	"How did we get here?"	`/narratives` → `/archaeology`

Now mode maps current design as decisions. History mode captures evolution and pivots.

Skills Overview

/pulse - Map Current Design

Take the pulse of a system - what decisions define how it works TODAY.

# Start with a goal
deciduous add goal "API rate limiting behavior" -c 90

# Map options (possible approaches from the goal)
deciduous add option "Identify users by auth token" -c 85
deciduous link 1 2 -r "possible_approach"

deciduous add option "Use IP-based rate limiting" -c 85
deciduous link 1 3 -r "possible_approach"

Output: Decision tree of the current model (goal -> options -> decisions).

/narratives - Understand Evolution

Understand how the system evolved. Narratives are conceptual, not tied to commits.

Look at the current system
Ask "how did this get this way?"
Infer narratives from the design
Find evidence (commits, PRs, docs)
Identify pivots - where the model changed

Output: .deciduous/narratives.md with evolution stories.

/archaeology - Structure for Query

Transform narratives into a queryable graph.

Narrative Element	Graph Node
Title	`goal`
Possible approach	`option`
Choosing an approach	`decision`
What was learned	`observation`
PIVOT	`revisit`

Output: Connected graph with Now ← revisit ← History.

Slash Commands

All slash commands are bootstrapped by deciduous init and updated by deciduous update.

Read the full file on GitHub · 863 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.

1mo ago Changed · +38 tokens per session 4ada71bc3fa0
2mo ago Changed · -37 lines · +16 tokens per session bde9b0bfcb3c
2mo ago First seen · 900 lines · 7,066 tokens per session scan A 15bca1afc1e5

Subscribe to this mod's changes

deciduous AGENTS.md is an instructions file published in the GitHub repository notactuallytreyanastasio/deciduous (169 stars, last pushed 13d ago), licensed Apache-2.0. It adds 7,120 tokens to every session, about $0.0285 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.

deciduous AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
deciduous AGENTS.mdnotactuallytreyanastasio/deciduous	Instructions file	169	13d ago	Apache-2.0	A	7,120	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	today	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

deciduous: Instructions file for Codex