Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/kora-projects/kora-skillsnpx agentmods add skills/kora-projects/kora-skills/kora-s3Wrote 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/kora-projects/kora-skills/kora-s3)<a href="https://agentmods.dev/skills/kora-projects/kora-skills/kora-s3"><img src="https://agentmods.dev/badge/skills/kora-projects/kora-skills/kora-s3/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/kora-projects/kora-skills/kora-s3"><img src="https://agentmods.dev/badge/skills/kora-projects/kora-skills/kora-s3.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00060 | $0.03624 |
| Opus 5 | $0.00030 | $0.01812 |
| Sonnet 5 | $0.00012 | $0.00725 |
| Haiku 4.5 | $0.00006 | $0.00362 |
Grade A, and why
kora-s3 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.
How it starts
The opening of the file, as written. The whole thing — 324 lines — stays where its author put it; the contents beside it link to each section on GitHub.
kora-s3 — object storage
Kora sub-skill — obey the kora-v1 meta rules on every task: R0 ensure
.kora-agent/docs+examples are cloned · R1 read this sub-skill before writing code · R2 Kora APIs only — no Spring/Micronaut/Quarkus, no invented annotations or config keys · R3 journal any incorrect Kora usage. Add comments/Javadoc only if asked.
Read this first when:
- adding S3-compatible storage (AWS S3, MinIO, Ceph) to a Kora app,
- choosing between AWS SDK (
s3-client-aws) and MinIO (s3-client-minio) implementations, - writing declarative
@S3.Clientinterfaces vs using imperativeS3KoraClient, - streaming large files via multipart uploads with
S3Body.ofPublisher(), - modeling S3 key templates with
{argName}path substitutions, - handling S3-specific responses (
GetObjectResponse,ListObjectsV2Response, presigned URLs).
Pick an implementation
| Aspect | AWS SDK | MinIO |
|---|---|---|
| Artifact | ru.tinkoff.kora.experimental:s3-client-aws |
ru.tinkoff.kora.experimental:s3-client-minio |
| Module | AwsS3ClientModule (ru.tinkoff.kora.s3.client.aws) |
MinioS3ClientModule (ru.tinkoff.kora.s3.client.minio) |
| Native client classes | S3Client (sync), S3AsyncClient (async), S3AsyncClient @Tag(MultipartUpload.class) (batch uploads) |
MinioClient (sync), MinioAsyncClient (async) |
| HTTP transport | Any kora-client HTTP module (required) |
Auto-creates OkHttp; or use the OkHttp module |
| Best for | AWS S3 itself, deep S3 feature use (versioning, ACL, etc.), AWS Java SDK ecosystem | MinIO server, simpler API surface, smaller dependency footprint |
Plug exactly one. Both expose Kora's common S3KoraClient / S3KoraAsyncClient API on top, so declarative @S3.Client interfaces are portable between them — switching implementations changes only the module on @KoraApp and a few config keys.
implementation "ru.tinkoff.kora.experimental:s3-client-aws"
implementation "ru.tinkoff.kora:http-client-async" // any kora-client HTTP module
What ships with it
7 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.
- 9d ago First seen · 324 lines · 60 tokens per session scan A 7fd84da23870
kora-s3 is a skill published in the GitHub repository kora-projects/kora-skills (1 stars, last pushed 9d ago), licensed Apache-2.0. It adds 60 tokens to every session and 3,624 once invoked, about $0.0003 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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