brevix-sonnet

brevix-sonnet is an agent for Claude Code from Yash-Koladiya30/brevix. It costs 73 tokens per session (311 once invoked), scanned A, original, MIT.

A mid-range coding agent based on Sonnet 4.6, intended for everyday development work between faster lightweight models and more capable expensive ones.

In plain words
What is it for?
Use it for code reviews, refactoring one module, debugging familiar problems, explaining code, writing documentation or replies, and implementing feature specifications.
Why use it?
It handles common coding tasks without using the most expensive model. It also signals when a problem needs broader architectural thinking or more difficult reasoning.

Agent for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter.

Part of the brevix plugin — 3 skills, 6 agents shipped together

Good fit Use it for code reviews, refactoring one module, debugging familiar problems, explaining code, writing documentation or replies, and implementing feature specifications.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/yash-koladiya30/brevix/brevix-sonnet
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.

Clone the repo
git clone --depth 1 https://github.com/Yash-Koladiya30/brevix

Made for: Claude Code.

Or install brevix, the plugin that ships this one along with the rest of its 3 skills, 6 agents.

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 brevix-sonnet

README.md
[![agentmods](https://agentmods.dev/badge/agents/yash-koladiya30/brevix/brevix-sonnet/github.svg)](https://agentmods.dev/agents/yash-koladiya30/brevix/brevix-sonnet)
Your own site
<a href="https://agentmods.dev/agents/yash-koladiya30/brevix/brevix-sonnet"><img src="https://agentmods.dev/badge/agents/yash-koladiya30/brevix/brevix-sonnet/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 brevix-sonnet

Your own site · 80×15
<a href="https://agentmods.dev/agents/yash-koladiya30/brevix/brevix-sonnet"><img src="https://agentmods.dev/badge/agents/yash-koladiya30/brevix/brevix-sonnet.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 73 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 311 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 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 $0.00073 $0.00311
Opus 5 $0.00036 $0.00156
Sonnet 5 $0.00015 $0.00062
Haiku 4.5 $0.00007 $0.00031

Measured 12d ago against content hash 3f59240abe9e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

brevix-sonnet 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 12d 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/brevix-sonnet.md · 37 lines

What it actually says

Brevix Sonnet Tier

The default workhorse. Most coding tasks land here.

Good fit

  • Code review (correctness, edge cases, idioms)
  • Refactoring within a single module
  • Debugging a known-bug-class issue
  • Explaining how a piece of code works
  • Writing a reply, doc, or short-form content where tone matters
  • Implementing a feature spec end-to-end

Bad fit (escalate to Opus)

  • Cross-cutting architecture decisions
  • Designing multi-service / multi-agent systems
  • Hard bugs that span many files and require novel reasoning
  • Requirements you have to invent rather than implement

Output rule

Be direct and load-bearing. Skip restating the prompt. Cite file:line when referring to code. End with the next-action one-liner.

Escalation signal

If the task exceeds Sonnet's range, return: escalate: <reason> The dispatcher will retry on Opus.

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. 12d ago First seen · 37 lines · 73 tokens per session scan A 3f59240abe9e

Subscribe to this mod's changes

brevix-sonnet is an agent published in the GitHub repository Yash-Koladiya30/brevix (4 stars, last pushed 24d ago), licensed MIT. It adds 73 tokens to every session and 311 once invoked, about $0.0004 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.