Turso is an in-process SQL database written in Rust that is compatible with SQLite and also accepts PostgreSQL syntax through an experimental frontend. It is for applications and organizations that need an embeddable database engine with support for multiple languages, platforms, and database features. The catalogue entries are skills and instructions for working with Turso.
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 agentmods add skills/tursodatabase/turso/storage-formatnpx skills add tursodatabase/turso --skill storage-formatgit clone --depth 1 https://github.com/tursodatabase/tursoWrote 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/tursodatabase/turso/storage-format)<a href="https://agentmods.dev/skills/tursodatabase/turso/storage-format"><img src="https://agentmods.dev/badge/skills/tursodatabase/turso/storage-format.svg" alt="Measured on agentmods" 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 | $0.00026 | $0.01080 |
| Opus 5 | $0.00013 | $0.00540 |
| Sonnet 5 | $0.00005 | $0.00216 |
| Haiku 4.5 | $0.00003 | $0.00108 |
Grade A, and why
storage-format 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 5d 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 — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Storage Format Guide
Database File Structure
┌─────────────────────────────┐
│ Page 1: Header + Schema │ ← First 100 bytes = DB header
├─────────────────────────────┤
│ Page 2..N: B-tree pages │ ← Tables and indexes
│ Overflow pages │
│ Freelist pages │
└─────────────────────────────┘
Page size: power of 2, 512-65536 bytes. Default 4096.
Database Header (First 100 Bytes)
| Offset | Size | Field |
|---|---|---|
| 0 | 16 | Magic: "SQLite format 3\0" |
| 16 | 2 | Page size (big-endian) |
| 18 | 1 | Write format version (1=rollback, 2=WAL) |
| 19 | 1 | Read format version |
| 24 | 4 | Change counter |
| 28 | 4 | Database size in pages |
| 32 | 4 | First freelist trunk page |
| 36 | 4 | Total freelist pages |
| 40 | 4 | Schema cookie |
| 56 | 4 | Text encoding (1=UTF8, 2=UTF16LE, 3=UTF16BE) |
All multi-byte integers: big-endian.
Page Types
| Flag | Type | Purpose |
|---|---|---|
| 0x02 | Interior index | Index B-tree internal node |
| 0x05 | Interior table | Table B-tree internal node |
| 0x0a | Leaf index | Index B-tree leaf |
| 0x0d | Leaf table | Table B-tree leaf |
| - | Overflow | Payload exceeding cell capacity |
| - | Freelist | Unused pages (trunk or leaf) |
B-tree Structure
Two B-tree types:
- Table B-tree: 64-bit rowid keys, stores row data
- Index B-tree: Arbitrary keys (index columns + rowid)
Interior page: [ptr0] key1 [ptr1] key2 [ptr2] ...
│ │ │
▼ ▼ ▼
child child child
pages pages pages
Leaf page: key1:data key2:data key3:data ...
Page 1 always root of sqlite_schema table.
Cell Format
Table Leaf Cell
[payload_size: varint] [rowid: varint] [payload] [overflow_ptr: u32?]
Table Interior Cell
[left_child_page: u32] [rowid: varint]
Index Cells
Similar but key is arbitrary (columns + rowid), not just rowid.
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.
- 5d ago First seen · 142 lines · 26 tokens per session scan A 2a01b17ecf4b
storage-format is a skill published in the GitHub repository tursodatabase/turso (24,170 stars, last pushed today), licensed MIT. It adds 26 tokens to every session and 1,080 once invoked, about $0.0001 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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