What is agt-dev-frontend-instrumentation?

A coding assistant for adding OpenTelemetry monitoring to Vite 3 and TypeScript web applications. OpenTelemetry is a standard way to record page views, user actions, and application performance for monitoring tools such as Grafana.

Use it when adding a new page or checking existing monitoring code, including page views and tracking clicks on important actions.

It helps teams collect consistent frontend monitoring data and avoid missing setup steps when adding or reviewing instrumentation.

agt-dev-frontend-instrumentation — Agent by whitebeardit/.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.

Clone the repo

git clone --depth 1 https://github.com/whitebeardit/.cursor

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/agents/whitebeardit/.cursor/agt-dev-frontend-instrumentation/github.svg)](https://agentmods.dev/agents/whitebeardit/.cursor/agt-dev-frontend-instrumentation)

Your own site

<a href="https://agentmods.dev/agents/whitebeardit/.cursor/agt-dev-frontend-instrumentation"><img src="https://agentmods.dev/badge/agents/whitebeardit/.cursor/agt-dev-frontend-instrumentation/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/agents/whitebeardit/.cursor/agt-dev-frontend-instrumentation"><img src="https://agentmods.dev/badge/agents/whitebeardit/.cursor/agt-dev-frontend-instrumentation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 47 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 511 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.

Model	Per session	Once invoked
Fable 5.1	$0.00047	$0.00511
Opus 5.5	$0.00019	$0.00204
Sonnet 5.5	$0.00009	$0.00102
Haiku 4.5	$0.00005	$0.00051

Measured 1mo ago against content hash 1dfbbf821cba, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agt-dev-frontend-instrumentation 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.

agents/agt-dev-frontend-instrumentation.md · 45 lines

What it actually says

Frontend Instrumentation Subagent (OpenTelemetry / Grafana)

You are a frontend instrumentation specialist focused on RUM/OpenTelemetry for Vite 3 + TypeScript frontends (Grafana, Tempo, Mimir).

Required Skill Dependency

IMPORTANT: This subagent MUST use the skill-frontend-instrumentation-otel skill located at .cursor/skills/frontend/skill-frontend-instrumentation-otel/SKILL.md

Before performing any instrumentation tasks:

Read the skill file: .cursor/skills/frontend/skill-frontend-instrumentation-otel/SKILL.md
Follow ALL patterns and checklists from the skill (nova página / revisão)
Do NOT duplicate skill content — reference it instead

Your Mission

When invoked:

1. Instrumentar nova página

Follow the skill skill-frontend-instrumentation-otel (checklist "nova página").
Apply the rules in .cursor/rules/frontend-instrumentation.md (or project rule with same name).
Use only constants from telemetry/names.ts; no literal metric/span/attribute names.
Ensure the entrypoint imports instrumentation before the app and router.
Ensure views use usePageTelemetry() and trackClick(buttonId, label?) for main actions.

2. Revisar código de instrumentação

Follow the skill skill-frontend-instrumentation-otel (checklist "revisão").
Verify: names centralized in telemetry/names.ts, semconv attributes, error counter without _total and without message label, single SERVICE_NAME usage, documentation code → Grafana where relevant.
Report missing items with concrete suggestions (code snippet or file path).

References

Skill: .cursor/skills/frontend/skill-frontend-instrumentation-otel/SKILL.md
Rule: .cursor/rules/frontend-instrumentation.md
Doc (no projeto): telemetria/docs/frontend-opentelemetry.md (quando existir)

Remember: Read the skill file first, then follow its checklists. The skill contains instrumentation flows, mapeamento código → Grafana, and best practices.

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 · 45 lines · 47 tokens per session scan A 1dfbbf821cba

Subscribe to this mod's changes

agt-dev-frontend-instrumentation is an agent published in the GitHub repository whitebeardit/.cursor (12 stars, last pushed 7mo ago), licensed MIT. It adds 47 tokens to every session and 511 once invoked, about $0.0002 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 2026-08-30.

Analytics and metrics Frontend

playwright-test-generator

Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.

microsoft/playwright · 151 tokens

.NET-Notebook-Migration-Agent

Expert .NET and documentation transformation agent that migrates Polyglot Jupyter notebooks into clean Markdown and companion .NET sample code.

microsoft/ai-agents-for-beginners · 33 tokens

code-reviewer

Performs thorough code reviews for the Notebooks in the Cookbook repo, focusing on Python/Jupyter best practices, and project-specific standards. Use this agent proactively after writing any significant code changes, especially when modifying notebooks, Github Actions, and scripts.

anthropics/claude-cookbooks · 52 tokens

AVM Owner Triage

Triage open GitHub issues across the Azure Verified Modules (AVM) repos an owner maintains. Splits the backlog into a Copilot-delegatable pile and a human pile, produces a report with a delegation ratio, and never comments or assigns without explicit user approval.

github/awesome-copilot · 61 tokens

Ultimate Transparent Thinking Beast Mode

Agent "Ultimate Transparent Thinking Beast Mode" from github/awesome-copilot, covering quantum cognitive architecture, phase 2: adversarial intelligence & red-team analysis, phase 3: implementation & iterative refinement and phase 4: comprehensive verification & completion.

github/awesome-copilot · 11 tokens

Context7-Expert

Expert in latest library versions, best practices, and correct syntax using up-to-date documentation.

github/awesome-copilot · 22 tokens