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 ww-w-ai/bkit-claude-code --skill bkend-storagegit clone --depth 1 https://github.com/ww-w-ai/bkit-claude-codeWrote 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/ww-w-ai/bkit-claude-code/bkend-storage)<a href="https://agentmods.dev/skills/ww-w-ai/bkit-claude-code/bkend-storage"><img src="https://agentmods.dev/badge/skills/ww-w-ai/bkit-claude-code/bkend-storage.svg" alt="Measured on agentmods" 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 | $0.00050 | $0.00928 |
| Opus 5 | $0.00025 | $0.00464 |
| Sonnet 5 | $0.00010 | $0.00186 |
| Haiku 4.5 | $0.00005 | $0.00093 |
Grade A, and why
bkend-storage 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 8d 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 — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.
bkend.ai Storage Guide
Upload Methods
| Method | Use Case | Process |
|---|---|---|
| Single | Normal files | Presigned URL -> PUT upload -> Register metadata |
| Multiple | Multiple files | Repeat single upload |
| Multipart | Large files | Initialize -> Part URLs -> Complete |
Presigned URL
- Validity: 15 minutes
- PUT method with file binary
- Content-Type header required
File Visibility (4 levels)
| Level | Access | URL Type |
|---|---|---|
| public | Anyone | CDN URL (no expiry) |
| private | Owner only | Presigned URL (1 hour) |
| protected | Authenticated users | Presigned URL (1 hour) |
| shared | Specified targets | Presigned URL (1 hour) |
Size Limits
| Category | Max Size |
|---|---|
| Images | 10 MB |
| Videos | 100 MB |
| Documents | 20 MB |
Storage Categories
images, documents, media, attachments
MCP Storage Workflow
bkend MCP does NOT have dedicated storage tools. Use this workflow:
- Search docs:
search_docswith query "file upload presigned url" - Get examples:
search_docswith query "file upload code examples" - Generate code: AI generates REST API code for file operations
Searchable Storage Docs
| Doc ID | Content |
|---|---|
7_code_examples_data |
CRUD + file upload code examples |
REST Storage API
| Method | Endpoint | Description |
|---|---|---|
| POST | /v1/files/presigned-url | Generate presigned URL |
| POST | /v1/files | Register metadata (complete upload) |
| GET | /v1/files | File list |
| GET | /v1/files/:fileId | File detail |
| PATCH | /v1/files/:fileId | Update metadata |
| DELETE | /v1/files/:fileId | Delete file |
| POST | /v1/files/:fileId/download-url | Generate download URL |
Multipart Upload (Large Files)
| Method | Endpoint | Description |
|---|---|---|
| POST | /v1/files/multipart/init | Initialize multipart upload |
| POST | /v1/files/multipart/presigned-url | Get part upload URL |
| POST | /v1/files/multipart/complete | Complete multipart upload |
| POST | /v1/files/multipart/abort | Abort multipart upload |
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.
- 8d ago First seen · 118 lines · 50 tokens per session scan A b199011dfc9d
bkend-storage is a skill published in the GitHub repository ww-w-ai/bkit-claude-code (595 stars, last pushed 2d ago), licensed Apache-2.0. It adds 50 tokens to every session and 928 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 2026-08-30.
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