composing-context

An internal guide to assembling turn-specific retrieved information into a preface added to an agent's input. It documents the composePreface helper used by infrastructure code.

In plain words
What is it for?
Use it when working on the @atlas/core agent-context system or the code that builds per-turn language-model input.
Why use it?
It helps maintain the code that prepares the information an agent receives on each turn.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/friday-platform/friday-studio/composing-context
Any agent
npx skills add friday-platform/friday-studio --skill composing-context
Clone the repo
git clone --depth 1 https://github.com/friday-platform/friday-studio

Made for: Claude Code, Codex.

Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,500 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00063 $0.01500
Opus 5 $0.00032 $0.00750
Sonnet 5 $0.00013 $0.00300
Haiku 4.5 $0.00006 $0.00150

Measured 3d ago against content hash 875aaf7d6d5d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

composing-context 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 3d 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.

packages/system/skills/composing-context/SKILL.md · 143 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 3d ago First seen · 143 lines · 63 tokens per session scan A 875aaf7d6d5d

Subscribe to this mod's changes

composing-context is a skill published in the GitHub repository friday-platform/friday-studio (101 stars, last pushed 4d ago), with no licence file. It adds 63 tokens to every session and 1,500 once invoked, about $0.0003 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 2026-08-30.

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