app-sidecar

app-sidecar is a skill for Claude Code from ryan-haver/fusebase-mcp. It costs 66 tokens per session (3,577 once invoked), scanned B, original, no licence file.

A guide to sidecar containers, which are extra containers that run alongside an app backend to provide supporting services.

In plain words
What is it for?
It helps add, remove, and list sidecar containers and configure their networking, environment variables, and resource tiers.
Why use it?
It helps manage auxiliary tools without putting all of their code inside the main backend.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Part of the fusebase plugin — 16 skills, 2 agents, 1 hook, 1 MCP server shipped together

Good fit It helps add, remove, and list sidecar containers and configure their networking, environment variables, and resource tiers.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ryan-haver/fusebase-mcp/app-sidecar
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.

Any agent
npx skills add ryan-haver/fusebase-mcp --skill app-sidecar
Clone the repo
git clone --depth 1 https://github.com/ryan-haver/fusebase-mcp

Made for: Claude Code.

Or install fusebase, the plugin that ships this one along with the rest of its 16 skills, 2 agents, 1 hook, 1 MCP server.

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 app-sidecar

README.md
[![agentmods](https://agentmods.dev/badge/skills/ryan-haver/fusebase-mcp/app-sidecar/github.svg)](https://agentmods.dev/skills/ryan-haver/fusebase-mcp/app-sidecar)
Your own site
<a href="https://agentmods.dev/skills/ryan-haver/fusebase-mcp/app-sidecar"><img src="https://agentmods.dev/badge/skills/ryan-haver/fusebase-mcp/app-sidecar/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.

agentmods 80×15 button for app-sidecar

Your own site · 80×15
<a href="https://agentmods.dev/skills/ryan-haver/fusebase-mcp/app-sidecar"><img src="https://agentmods.dev/badge/skills/ryan-haver/fusebase-mcp/app-sidecar.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 66 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,577 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00066 $0.03577
Opus 5 $0.00033 $0.01788
Sonnet 5 $0.00013 $0.00715
Haiku 4.5 $0.00007 $0.00358

Measured 3d ago against content hash 6412c6ee62d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-16, from the pricing page.

Security

Grade B, and why

app-sidecar scanned grade B 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 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.

Sends data to an external URLmediumData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

const res = await fetch("http://localhost:9222/screenshot", { method: "POST",
apps/client-portal-dashboard/.claude/skills/app-sidecar/SKILL.md · 391 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 · 391 lines · 66 tokens per session scan B 6412c6ee62d8

Subscribe to this mod's changes

app-sidecar is a skill published in the GitHub repository ryan-haver/fusebase-mcp (5 stars, last pushed yesterday), with no licence file. It adds 66 tokens to every session and 3,577 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (sends data to an external url). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-13.

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