What is catalyst-stratus?

An object storage service for saving and retrieving files, with temporary signed links and support for splitting large uploads into parts. It uses its own SDK rather than the APIs used by Amazon S3 or Google Cloud Storage.

Use it for file uploads, downloads, deletions, signed upload or download links, and multipart uploads for large files.

It gives applications a place to store files and lets users upload or download them directly through time-limited links. It also provides a migration tool for moving data from Amazon S3 or Google Cloud Storage.

catalyst-stratus — Skill for Claude Code by catalystbyzoho

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 catalystbyzoho/agent-skills --skill catalyst-stratus

Clone the repo

git clone --depth 1 https://github.com/catalystbyzoho/agent-skills

Made for: Claude Code.

Or install catalyst-by-zoho, the plugin that ships this one along with the rest of its 16 skills, 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/catalystbyzoho/agent-skills/catalyst-stratus/github.svg)](https://agentmods.dev/skills/catalystbyzoho/agent-skills/catalyst-stratus)

Your own site

<a href="https://agentmods.dev/skills/catalystbyzoho/agent-skills/catalyst-stratus"><img src="https://agentmods.dev/badge/skills/catalystbyzoho/agent-skills/catalyst-stratus/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/catalystbyzoho/agent-skills/catalyst-stratus"><img src="https://agentmods.dev/badge/skills/catalystbyzoho/agent-skills/catalyst-stratus.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 88 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 506 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

Socket pass 15 Aug 2026
Snyk pass 15 Aug 2026
NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00088	$0.00506
Opus 5	$0.00044	$0.00253
Sonnet 5	$0.00018	$0.00101
Haiku 4.5	$0.00009	$0.00051

Measured 9d ago against content hash fc5ceab62aee, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

catalyst-stratus 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 9d 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.

skills/catalyst-stratus/SKILL.md · 31 lines

What it actually says

How It Works

Bucket naming — Bucket names are globally unique. Use {app-name}-{project-id-prefix} pattern to avoid collisions.
Load references/stratus-basics.md — for upload/download/delete patterns, the 250 GB single-upload limit, signed URL generation, and multipart setup.
Large files — Multipart upload is recommended (not required) for files ≥ 100 MB. Single-shot upload supports up to 250 GB per object. Load the multipart section of stratus-basics.md.
Signed URLs — For user-facing direct downloads/uploads, generate a signed URL server-side and return it to the client.

Response Syntax Default

When writing function code that returns a Stratus result to the client, default to native Node.js response syntax — not Express. Advanced I/O exposes raw http.ServerResponse; res.status() and res.json() do not exist unless the user explicitly chose the Express template.

Native (default): res.writeHead(200, { 'Content-Type': 'application/json' }); res.end(JSON.stringify(data));
Express (opt-in only): only if the user has express installed and wired as middleware

Triggers

Use this skill for: "Stratus", "object storage", "file storage", "upload file", "download file", "signed URL", "pre-signed URL", "multipart upload", putObject, getObject, "bucket", "Stratus bucket", "store files on Catalyst", "Stratus vs File Store", "250GB limit", or "file download link".

References

Reference	Load when the query is about…
`references/stratus-basics.md`	Upload/download/delete, 250GB single-shot limit, multipart (recommended for ≥100 MB), signed URLs, busboy upload pattern, bucket naming rules

Files

What ships with it

1 file 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.

references/stratus-basics.md 16 KB

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.

9d ago First seen · 31 lines · 88 tokens per session scan A fc5ceab62aee

Subscribe to this mod's changes

catalyst-stratus is a skill published in the GitHub repository catalystbyzoho/agent-skills (59 stars, last pushed 11d ago), licensed Apache-2.0. It adds 88 tokens to every session and 506 once invoked, about $0.0004 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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