generate-snapshot-tests

A guide to generating snapshot tests for Sentry React components. Snapshot tests save a component’s rendered output so later changes can be compared with it.

In plain words
What is it for?
Use it to create snapshot files for a specified React component or to add visual regression coverage to a component.
Why use it?
It makes visual or structural changes easier to detect during frontend development.

Skill for Claude CodeCodex

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 skills/getsentry/sentry/generate-snapshot-tests
Any agent
npx skills add getsentry/sentry --skill generate-snapshot-tests
Clone the repo
git clone --depth 1 https://github.com/getsentry/sentry

Made for: Claude Code, Codex.

Per session 66 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,854 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00066 $0.02854
Opus 5 $0.00033 $0.01427
Sonnet 5 $0.00013 $0.00571
Haiku 4.5 $0.00007 $0.00285

Measured 3d ago against content hash 53eedd8d51ec, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

generate-snapshot-tests 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 3d 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/skills/generate-snapshot-tests/SKILL.md · 353 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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.

  1. 3d ago First seen · 353 lines · 66 tokens per session scan A 53eedd8d51ec

Subscribe to this mod's changes

generate-snapshot-tests is a skill published in the GitHub repository getsentry/sentry (44,660 stars, last pushed 3d ago), with no licence file. It adds 66 tokens to every session and 2,854 once invoked, about $0.0003 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 2026-08-30.

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