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.
npx skills add meteor/agent-skills --skill migrate-to-rspackgit clone --depth 1 https://github.com/meteor/agent-skillsWrote 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.
[](https://agentmods.dev/skills/meteor/agent-skills/migrate-to-rspack)<a href="https://agentmods.dev/skills/meteor/agent-skills/migrate-to-rspack"><img src="https://agentmods.dev/badge/skills/meteor/agent-skills/migrate-to-rspack/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.
<a href="https://agentmods.dev/skills/meteor/agent-skills/migrate-to-rspack"><img src="https://agentmods.dev/badge/skills/meteor/agent-skills/migrate-to-rspack.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00240 | $0.02400 |
| Opus 5 | $0.00120 | $0.01200 |
| Sonnet 5 | $0.00048 | $0.00480 |
| Haiku 4.5 | $0.00024 | $0.00240 |
Grade A, and why
migrate-to-rspack 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 yesterday.
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.
How it starts
The opening of the file, as written. The whole thing — 237 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Migrate an existing app to Rspack
Rspack compiles app code while Meteor builds Atmosphere packages and assembles the final bundle. Do not rewrite packages merely because Rspack is enabled, but audit their architecture declarations and browser-incompatible dependencies.
Prerequisite: Meteor 3.4+. Strongly recommended to enable
"meteor": { "modern": true } first (Meteor 3.3+) and fix Babel fallbacks,
then add Rspack. See the meteor-modern-build-stack skill for the
activation knobs and rspack.config.js shape.
Match @meteorjs/rspack to the Meteor release, not to
@rspack/core or @rspack/cli:
| Meteor | rspack |
@meteorjs/rspack |
Capability boundary |
|---|---|---|---|
| 3.4 | 1.0.0 |
1.0.0 |
Base integration and helpers. |
| 3.4.1 and 3.5 | 1.1.0 |
2.0.1 |
Adds v2 helpers and inherited TOOL_NODE_FLAGS. |
| 3.5.1 | 1.2.0 |
2.1.0 |
Revised client polyfills and extension discovery. |
| 3.5.2 | 1.3.0 |
2.2.0 |
Dependency diagnostics, mode isolation, full-app/TLA and cache fixes. |
The Atmosphere, Meteor npm integration, and Rspack core package versions are
independent. Inspect .meteor/versions, package.json, and the lockfile. After
changing the Meteor release, run meteor update --npm, inspect the npm changes,
and commit the dependency files. Do not pair a newer integration major with an
older Meteor release only to copy a current helper.
Decision flow
- Does the app define client and server entry points in
package.jsonmeteor.mainModule? If no, define them. Required. - Trace the client and client-test graphs. Do they reach CommonJS export
assignments, Node built-ins, server-only local package entries, or missing
generated inputs in a clean checkout? If yes, repair the boundary before
activation. See
references/client-graph-preflight.md. - Does the app code contain nested imports (ES
importinside anif, function, or other block)? If yes, move them to top level or convert them to dynamicimport()/require. Required for app code; OK in Atmosphere packages. - Does the app rely on a Meteor build plugin (
less,fourseven:scss,coffeescript,zodern:melte,jorgenvatle:vite)? Plan an Rspack loader replacement and prove capability parity before removal. Seereferences/framework-and-css.md. - Does the app rely on bare default imports from CommonJS packages
(
import x from "some-cjs")? Decide between rewriting toimport * as xor restoring Meteor-style interop in.swcrc. Seereferences/code-migrations.md. - Is the app server-only? Set only
mainModule.server. Rspack still bundles the server; client is skipped. - Does the app keep CSS or HTML outside its entry folder, or import app-local
symlinks? Preserve the boundary with
meteor.modulesorresolve.symlinks: false; see the references. - Run
meteor add rspackand watch the verbose[Transpiler]log for remaining(app)failures.
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- yesterday Changed · -8 lines 7a28aa3b8e1f
- 10d ago First seen · 245 lines · 240 tokens per session scan A fd9a5d270053
migrate-to-rspack is a skill published in the GitHub repository meteor/agent-skills (8 stars, last pushed today), licensed MIT. It adds 240 tokens to every session and 2,400 once invoked, about $0.0012 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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