What is briefs-and-premises?

A writing guide for plans, task descriptions, handoffs, review findings, design changes, bug reports, and commit messages. It focuses on recording the context and reasons another person or agent would otherwise need to rediscover.

Use it when preparing work for another agent or session, documenting a bug or design decision, or explaining a commit.

It makes work easier to continue later by preserving what changed, why it changed, and where the relevant code or information is located.

How r3bb1t/llvmkit configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to r3bb1t/llvmkit. 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/r3bb1t/llvmkit/master/.claude/skills/briefs-and-premises/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/r3bb1t/llvmkit

Made for: Claude Code.

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/skills/r3bb1t/llvmkit/briefs-and-premises/github.svg)](https://agentmods.dev/skills/r3bb1t/llvmkit/briefs-and-premises)

Your own site

<a href="https://agentmods.dev/skills/r3bb1t/llvmkit/briefs-and-premises"><img src="https://agentmods.dev/badge/skills/r3bb1t/llvmkit/briefs-and-premises/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/skills/r3bb1t/llvmkit/briefs-and-premises"><img src="https://agentmods.dev/badge/skills/r3bb1t/llvmkit/briefs-and-premises.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 126 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,606 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00126	$0.01606
Opus 5.5	$0.00050	$0.00642
Sonnet 5.5	$0.00025	$0.00321
Haiku 4.5	$0.00013	$0.00161

Measured 1mo ago against content hash fc6772d42db1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

briefs-and-premises 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.

.claude/skills/briefs-and-premises/SKILL.md · 124 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

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.

1mo ago First seen · 124 lines · 126 tokens per session scan A fc6772d42db1

Subscribe to this mod's changes

briefs-and-premises is a skill published in the GitHub repository r3bb1t/llvmkit (25 stars, last pushed 6d ago), with no licence file. It adds 126 tokens to every session and 1,606 once invoked, about $0.0005 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 2026-09-13.

Project management Writing and docs llvm llvm-ir llvm-pass

briefs-and-premises next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
briefs-and-premisesr3bb1t/llvmkit	Skill	25	6d ago	none	A	126	Claude Code
dynamic-instrumentationgmh5225/awesome-llvm-security	Skill	890	1mo ago	MIT	A	42	Claude Code
llvm-learninggmh5225/awesome-llvm-security	Skill	890	1mo ago	MIT	A	39	Claude Code
llvm-optimizationgmh5225/awesome-llvm-security	Skill	890	1mo ago	MIT	A	44	Claude Code
llvm-toolinggmh5225/awesome-llvm-security	Skill	890	1mo ago	MIT	A	52	Claude Code
mlir-developmentgmh5225/awesome-llvm-security	Skill	890	1mo ago	MIT	A	54	Claude Code
compiler-developmentgmh5225/awesome-llvm-security	Skill	890	1mo ago	MIT	A	46	Claude Code

llvmkit: Skill for Claude Code