performance-analyzer

A performance checker for database access and, when relevant, web or native applications. It looks at response time, database indexes, repeated queries, rendering work, memory use, and related runtime costs.

In plain words
What is it for?
Use it to inspect relational-database queries, find N+1 query problems, review query plans and query counts, and check frontend or Swift application performance when those technologies are detected.
Why use it?
It helps locate slow data access, missing indexes, unnecessary repeated queries, expensive screen updates, memory leaks, and other causes of poor performance.

Agent

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/hmj1026/dhpk/performance-analyzer
Clone the repo
git clone --depth 1 https://github.com/hmj1026/dhpk
Per session 107 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,177 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 $0.00107 $0.01177
Opus 5 $0.00053 $0.00589
Sonnet 5 $0.00021 $0.00235
Haiku 4.5 $0.00011 $0.00118

Measured 2d ago against content hash 264dc6725703, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

performance-analyzer 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 2d 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/performance-analyzer.md · 76 lines

How it starts

The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Performance Analyzer

Lookup: cx / gitnexus per ${CLAUDE_PLUGIN_ROOT}/rules/tool-routing.md.

Scope

Audit query performance in the Repository (data-access) layer. database-reviewer owns correctness (bind parameters, IN/NOT IN, schema, transactions). This agent owns performance (latency, index usage, query count, N+1). Framework-agnostic — the relational perf checks apply to any data-access path. When a frontend (any JS / TS / Vue / React project) or native (swift) stack is detected, also audit client/runtime performance via the matching trap sheet (frontend.md / swift.md) — bundle size, render / re-render cost, memory leaks, Web Vitals, allocation hot paths.

When NOT

  • Bind params / schema / transactions (correctness, not latency) → database-reviewer

Stack trap sheet (load on demand)

Detect the active stack, then load ONLY the matching trap sheet(s); ignore other stacks — never grade a Yii/MySQL change against another stack's perf rules, or vice-versa.

  1. Shared detection: follow ${CLAUDE_PLUGIN_ROOT}/agent-traps/_common/trap-sheet-loader.md (<agent-name> = performance-analyzer). Do not paste its detection order here.
  2. Exceptions (keep inline):
    • Extra: root pyproject.toml sqlalchemy / alembic remain this agent's performance-specific detail.
    • Map module ids to the trap-sheet stack id before lookup: js / vue-2 / React / Next → frontend; swiftui / ios-platformswift. (Perf sheets are named frontend.md / swift.md.)
  3. Load matching sheets per the loader. Relational sheets carry hot-table / N+1 / EXPLAIN recipes; frontend / swift sheets carry bundle / render / memory recipes. No sheet matches → apply only the Baseline below.

Baseline (language-agnostic)

  • No full table scan on large tables — check the query plan (EXPLAIN / equivalent); a sequential scan on a high-volume table is a fix, not a warning.
  • Index hot columns — WHERE / ORDER BY columns are indexed; composite-index column order matches the predicate.
  • No N+1 — batch / eager-load related rows instead of running a query inside a loop.
  • Bound result sets — cap rows with LIMIT (or cursor pagination for deep pages); no unbounded fetch on high-volume tables.
  • Filter before sort — apply predicates to shrink the set before an expensive sort.
  • Stable query count — integration-test query count stays constant as data volume grows (does not scale with rows).

Read the full file on GitHub · 76 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.

  1. 2d ago First seen · 76 lines · 107 tokens per session scan A 264dc6725703

Subscribe to this mod's changes

performance-analyzer is an agent published in the GitHub repository hmj1026/dhpk (2 stars, last pushed 2d ago), licensed MIT. It adds 107 tokens to every session and 1,177 once invoked, about $0.0005 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.

Related

Other agents, from other repositories