What is pocket-scion-synth AGENTS.md?

Repository instructions for Pocket SCION, firmware that runs a real-time music synthesizer on embedded hardware. They explain the project structure, hardware connections, sound behavior, controls, and testing.

Use them when changing the synthesizer, board configuration, sound parameters, controls, MIDI behavior, documentation, or hardware tests.

They help a coding agent preserve reliable audio behavior and keep the project separate from proprietary firmware and sample content. They also identify which documentation and source files are authoritative.

How toonhuysmans/pocket-scion-synth configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to toonhuysmans/pocket-scion-synth. 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/toonhuysmans/pocket-scion-synth/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/toonhuysmans/pocket-scion-synth

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/toonhuysmans/pocket-scion-synth/agents-md/github.svg)](https://agentmods.dev/instructions/toonhuysmans/pocket-scion-synth/agents-md)

Your own site

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

Per session 1,475 This file is loaded in full into every session.

When invoked 1,475 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	$0.01475	$0.01475
Opus 5	$0.00737	$0.00737
Sonnet 5	$0.00295	$0.00295
Haiku 4.5	$0.00147	$0.00147

Measured 10d ago against content hash f40a43b8fa89, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

pocket-scion-synth 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 10d 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 · 159 lines

How it starts

The opening of the file, as written. The whole thing — 159 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository guidance for coding agents

Mission

Maintain and extend the clean-room Pocket SCION real-time synthesis firmware. Preserve musical behavior, real-time audio reliability, recoverability, and the project's separation from Instruō's proprietary firmware and sample content.

This file applies to the entire repository. A future, more specific AGENTS.md in a subdirectory may add or override guidance for that subtree.

Start here

Read the smallest relevant set before changing code:

README.md for product scope, installation, and recovery.
docs/platform.md for confirmed peripherals and GPIO assignments.
docs/architecture.md for real-time data flow and voice allocation.
docs/banks-and-parameters.md for patches and sensor routing.
docs/controls.md for gestures, LEDs, and MIDI behavior.
docs/reverse-engineering.md for provenance and confidence levels.
docs/hardware-testing.md for physical-device validation.

Treat the source, especially src/synth.cpp and src/board_pins.h, as authoritative when prose and implementation disagree. Correct stale prose in the same change.

Repository map

boards/       RP2040 board definition
pio/          I2S and WS2812 PIO programs
src/          firmware, synthesis, sequencing, controls, MIDI, and display
tests/        host-side deterministic tests
vendor/       pinned third-party PRA32-U DSP source and provenance
docs/         architecture, platform, interaction, and testing notes
releases/     curated release UF2 and checksum manifest

Build and test

The supported SDK is Raspberry Pi Pico SDK 2.2.0. Prefer an out-of-tree build and do not commit generated files.

export PICO_SDK_PATH=/absolute/path/to/pico-sdk
cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release
cmake --build build

Run the host sensor test for every change that touches sensor acquisition, statistics, or sequencing inputs:

cc -std=c11 -Wall -Wextra -Werror \
  -Isrc src/sensor_math.c tests/test_sensor_math.c \
  -lm -o /tmp/test_sensor_math
/tmp/test_sensor_math

Read the full file on GitHub · 159 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.

10d ago First seen · 159 lines · 1,475 tokens per session scan A f40a43b8fa89

Subscribe to this mod's changes

pocket-scion-synth AGENTS.md is an instructions file published in the GitHub repository toonhuysmans/pocket-scion-synth (12 stars, last pushed 29d ago), licensed MIT. It adds 1,475 tokens to every session, about $0.0074 per session on Opus 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.

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