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/null-shot/cloudflare-skills/d1-databasenpx skills add null-shot/cloudflare-skills --skill d1-databasegit clone --depth 1 https://github.com/null-shot/cloudflare-skillsWrote 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/null-shot/cloudflare-skills/d1-database)<a href="https://agentmods.dev/skills/null-shot/cloudflare-skills/d1-database"><img src="https://agentmods.dev/badge/skills/null-shot/cloudflare-skills/d1-database.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 | $0.00052 | $0.03563 |
| Opus 5 | $0.00026 | $0.01782 |
| Sonnet 5 | $0.00010 | $0.00713 |
| Haiku 4.5 | $0.00005 | $0.00356 |
Grade A, and why
d1-database scanned grade A 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
async fetch(request: Request, env: Env) { How it starts
The opening of the file, as written. The whole thing — 521 lines — stays where its author put it; the contents beside it link to each section on GitHub.
D1 Database
D1 is Cloudflare's native serverless SQL database built on SQLite. Run queries at the edge with automatic replication and low latency.
FIRST: Create Database
# Create D1 database
wrangler d1 create my-database
# Output includes database_id - add to wrangler.jsonc
Add binding to wrangler.jsonc:
{
"d1_databases": [
{
"binding": "DB",
"database_name": "my-database",
"database_id": "<DATABASE_ID>",
"migrations_dir": "./migrations"
}
]
}
Generate TypeScript types:
wrangler types
When to Use
| Use Case | Why D1 |
|---|---|
| Relational data | Structured tables with relationships |
| Complex queries | JOINs, aggregations, full SQL support |
| User data | Accounts, profiles, settings |
| Content management | Posts, comments, metadata |
| E-commerce | Products, orders, inventory |
| Analytics | Event tracking with SQL queries |
When NOT to use D1:
- Simple key-value data → Use Workers KV
- Large files/objects → Use R2
- Real-time coordination → Use Durable Objects
- High-frequency writes → Use Queues + D1
Quick Reference
| Operation | Method | Returns |
|---|---|---|
| Execute query | db.prepare(sql).bind(...).run() |
{ success: boolean, meta: {...} } |
| Get all rows | db.prepare(sql).bind(...).all() |
{ results: T[], success: boolean } |
| Get first row | db.prepare(sql).bind(...).first() |
T | null |
| Get single value | db.prepare(sql).bind(...).first('column') |
any | null |
| Batch queries | db.batch([stmt1, stmt2, ...]) |
Array<D1Result> |
| Raw query | db.prepare(sql).bind(...).raw() |
Array<Array<any>> |
Minimal Example
// src/index.ts
interface Env {
DB: D1Database;
}
export default {
async fetch(request: Request, env: Env) {
// Get all users
const { results } = await env.DB
.prepare("SELECT * FROM users WHERE active = ?")
.bind(true)
.all<{ id: number; name: string; email: string }>();
return Response.json(results);
}
} satisfies ExportedHandler<Env>;
What ships with it
6 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.
- 3d ago First seen · 521 lines · 52 tokens per session scan A 39c211231c70
d1-database is a skill published in the GitHub repository null-shot/cloudflare-skills (0 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 52 tokens to every session and 3,563 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It comes from a forked repository.
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