analyze-bundle

A tool for turning Next.js bundle-analyzer data into newline-separated JSON records that command-line tools can read.

In plain words
What is it for?
Use it to review route sizes, locate large source files, inspect module dependencies, and decide which bundle changes to make.
Why use it?
It makes bundle reports easier to search and inspect, so you can find which routes, files, and modules contribute most to the browser download.

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/vercel-labs/dev3000/analyze-bundle
Any agent
npx skills add vercel-labs/dev3000 --skill analyze-bundle
Clone the repo
git clone --depth 1 https://github.com/vercel-labs/dev3000

Made for: Claude Code, Codex.

Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 699 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 $0.00017 $0.00699
Opus 5 $0.00009 $0.00349
Sonnet 5 $0.00003 $0.00140
Haiku 4.5 $0.00002 $0.00070

Measured 2d ago against content hash ec17b1a3dfe9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

analyze-bundle 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/skills/analyze-bundle/SKILL.md · 83 lines

How it starts

The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.

analyze-to-ndjson

Converts Next.js bundle analyzer binary .data files into grep/jq-friendly NDJSON.

Analyze artifacts

This workflow pre-generates analyzer artifacts in:

  • .next/diagnostics/analyze/ndjson/routes.ndjson
  • .next/diagnostics/analyze/ndjson/sources.ndjson
  • .next/diagnostics/analyze/ndjson/output_files.ndjson
  • .next/diagnostics/analyze/ndjson/module_edges.ndjson
  • .next/diagnostics/analyze/ndjson/modules.ndjson

Focus on reading these files and using their evidence to prioritize changes.

Output files

File What's in it
modules.ndjson Global module registry (id, ident, path)
module_edges.ndjson Module dependency graph (from, to, kind: sync/async)
sources.ndjson Per-route source tree with sizes and environment flags
chunk_parts.ndjson Granular size data: one line per (source, output_file) pair
output_files.ndjson Per-route output files with aggregated sizes
routes.ndjson Route-level summaries

Browsing the output

Route overview

jq -s 'sort_by(-.total_compressed_size)' .next/diagnostics/analyze/ndjson/routes.ndjson

Find large sources

jq -s '
  group_by(.full_path)
  | map(max_by(.compressed_size))
  | sort_by(-.compressed_size)
  | .[0:10]
  | .[] | {full_path, compressed_size, size, route}
' .next/diagnostics/analyze/ndjson/sources.ndjson

Client-side JS

grep '"client":true' .next/diagnostics/analyze/ndjson/sources.ndjson \
  | grep '"js":true' \
  | jq -s 'sort_by(-.compressed_size) | .[0:10] | .[] | {full_path, compressed_size}'

Module dependencies

grep '"from":42,' .next/diagnostics/analyze/ndjson/module_edges.ndjson | jq .to
grep '"to":42,' .next/diagnostics/analyze/ndjson/module_edges.ndjson | jq .from
grep 'react-dom' .next/diagnostics/analyze/ndjson/modules.ndjson | jq '{id, path}'

Output files for a route

grep '"route":"/"' .next/diagnostics/analyze/ndjson/output_files.ndjson \
  | jq -s 'sort_by(-.total_compressed_size) | .[0:10] | .[] | {filename, total_compressed_size, num_parts}'

Read the full file on GitHub · 83 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 · 83 lines · 17 tokens per session scan A ec17b1a3dfe9

Subscribe to this mod's changes

analyze-bundle is a skill published in the GitHub repository vercel-labs/dev3000 (1,573 stars, last pushed 6d ago), licensed MIT. It adds 17 tokens to every session and 699 once invoked, about $0.0001 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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