start-core/execution-model

start-core/execution-model is a skill for Claude Code from lespaceman/athena-workflow-marketplace. It costs 63 tokens per session (2,060 once invoked), scanned A, original, no licence file.

Guidance for deciding whether code runs in the browser, on the server, or in both places in a TanStack Start application. It covers server-only and browser-only functions, hydration, import safety, and environment variables.

In plain words
What is it for?
It is for separating server and browser code, safely reading environment variables, delaying browser-dependent UI until it is ready, and removing unused environment-specific code.
Why use it?
It helps prevent code or secrets meant for one environment from being used in the wrong one, which can cause runtime errors or expose sensitive values.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the tanstack-start plugin — 23 skills shipped together

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/lespaceman/athena-workflow-marketplace/execution-model
Any agent
npx skills add lespaceman/athena-workflow-marketplace --skill execution-model
Clone the repo
git clone --depth 1 https://github.com/lespaceman/athena-workflow-marketplace

Made for: Claude Code.

Or install tanstack-start, the plugin that ships this one along with the rest of its 23 skills.

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.

agentmods badge for start-core/execution-model

README.md
[![agentmods](https://agentmods.dev/badge/skills/lespaceman/athena-workflow-marketplace/execution-model.svg)](https://agentmods.dev/skills/lespaceman/athena-workflow-marketplace/execution-model)
Your own site
<a href="https://agentmods.dev/skills/lespaceman/athena-workflow-marketplace/execution-model"><img src="https://agentmods.dev/badge/skills/lespaceman/athena-workflow-marketplace/execution-model.svg" alt="Measured on agentmods" height="20"></a>
Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,060 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 5.1 $0.00063 $0.02060
Opus 5 $0.00032 $0.01030
Sonnet 5 $0.00013 $0.00412
Haiku 4.5 $0.00006 $0.00206

Measured 2d ago against content hash 478d7227264b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

start-core/execution-model scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

return fetch(url, { headers: { Authorization: apiKey } })
plugins/tanstack-start/skills/upstream/@tanstack/start-client-core/skills/start-core/execution-model/SKILL.md · 303 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. 2d ago First seen · 303 lines · 63 tokens per session scan A 478d7227264b

Subscribe to this mod's changes

start-core/execution-model is a skill published in the GitHub repository lespaceman/athena-workflow-marketplace (4 stars, last pushed yesterday), with no licence file. It adds 63 tokens to every session and 2,060 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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