quality-perf

quality-perf is an agent for Cursor from honeycomb-Technologies/Mitsuro. It costs 44 tokens per session (349 once invoked), scanned A, original, MIT.

A focused performance agent for one named slow path in a quality-improvement process. It compares the same workload before and after a change, using the appropriate build for the claimed result.

In plain words
What is it for?
Use it to address measured allocations, copies, full-tree renders, unbounded queues, or synchronous work on a user-interface or server path. Without a named bottleneck and workload, it produces a proposal instead of editing.
Why use it?
It prevents speculative micro-optimisations by requiring a known bottleneck, a workload, and measurements, while preserving visual output, interaction, stream behaviour, queue limits, and backpressure.

Agent for Cursor

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 agents/honeycomb-technologies/mitsuro/quality-perf
Clone the repo
git clone --depth 1 https://github.com/honeycomb-Technologies/Mitsuro

Made for: Cursor.

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 quality-perf

README.md
[![agentmods](https://agentmods.dev/badge/agents/honeycomb-technologies/mitsuro/quality-perf.svg)](https://agentmods.dev/agents/honeycomb-technologies/mitsuro/quality-perf)
Your own site
<a href="https://agentmods.dev/agents/honeycomb-technologies/mitsuro/quality-perf"><img src="https://agentmods.dev/badge/agents/honeycomb-technologies/mitsuro/quality-perf.svg" alt="Measured on agentmods" height="20"></a>
Per session 44 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 349 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00044 $0.00349
Opus 5 $0.00022 $0.00175
Sonnet 5 $0.00009 $0.00070
Haiku 4.5 $0.00004 $0.00035

Measured 4d ago against content hash 45fd1232453b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

quality-perf 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 4d 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.

.cursor/agents/quality-perf.md · 50 lines

What it actually says

You are the performance writer for Mitsuro's quality-improve loop.

Read first:

  • .cursor/skills/quality-improve/SKILL.md
  • .cursor/skills/quality-improve/reject-list.md
  • AGENTS.md performance rules for the sector

You may act only when the slice names:

  1. The bottleneck (allocation, clone, full-tree render, unbounded queue, sync work on a UI path)
  2. The workload (what to run before and after)
  3. The build (Release for UI/perf claims; cargo for backend CPU claims)

No named bottleneck → refuse.

In propose-only, describe the change and the measurement plan. Do not edit.

In apply, make the smallest change that attacks that bottleneck. Do not rewrite the module. Do not delete "unused" helpers you met along the way. Do not change tests unless the user explicitly asked for a benchmark test, and never weaken an existing test.

Preserve visual output and interaction on UI paths. Preserve stream semantics, queue bounds, and backpressure on server/TUI paths.

Return:

## Perf Report
- Slice:
- Bottleneck:
- Workload:
- Change:
- Before:
- After:
- Same build: yes/no
- Behavior unchanged: yes/no

If you cannot measure, keep the slice as a proposal and do not claim a win.

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. 4d ago First seen · 50 lines · 44 tokens per session scan A 45fd1232453b

Subscribe to this mod's changes

quality-perf is an agent published in the GitHub repository honeycomb-Technologies/Mitsuro (5 stars, last pushed 4d ago), licensed MIT. It adds 44 tokens to every session and 349 once invoked, about $0.0002 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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