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.
git clone --depth 1 https://github.com/quadratichq/quadratic-mcp-pluginWrote 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/rules/quadratichq/quadratic-mcp-plugin/quadratic-mcp)<a href="https://agentmods.dev/rules/quadratichq/quadratic-mcp-plugin/quadratic-mcp"><img src="https://agentmods.dev/badge/rules/quadratichq/quadratic-mcp-plugin/quadratic-mcp/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/rules/quadratichq/quadratic-mcp-plugin/quadratic-mcp"><img src="https://agentmods.dev/badge/rules/quadratichq/quadratic-mcp-plugin/quadratic-mcp.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 | $0.00010 | $0.00182 |
| Opus 5 | $0.00005 | $0.00091 |
| Sonnet 5 | $0.00002 | $0.00036 |
| Haiku 4.5 | $0.00001 | $0.00018 |
Grade A, and why
quadratic-mcp 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.
What it actually says
Quadratic MCP
Use the quadratic MCP server when the user asks to inspect, create, import,
analyze, or edit Quadratic spreadsheets.
- Authenticate with
authactionloginbefore accessing private files. - Use
files_readto locate files andfiles_writeto open or create them. - Read spreadsheet context before fetching large ranges; prefer summaries, outlines, and targeted ranges over full-sheet reads.
- Use table references such as
TableName[Column]for table data instead of infinite A1 ranges. - Before writing cells, tables, formulas, or code, check the target area and leave at least one empty row or column between new content and existing data.
- Batch related reads or writes when possible to reduce tool calls.
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 · 20 lines · 10 tokens per session scan A 759841677db5
quadratic-mcp is a cursor rule published in the GitHub repository quadratichq/quadratic-mcp-plugin (0 stars, last pushed 2mo ago), licensed MIT. It adds 10 tokens to every session and 182 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 2026-08-31.
Other cursor rules, from other repositories
read-xlsx
Reading, writing, diffing, and repairing spreadsheets (.xlsx) for AI agents via the xfa MCP server.
16-numeric-grounding
OBLIGATORIO con planillas, CSV, totales o reportes — calcular con script, etiquetas VERIFICADO/DERIVADO.
ponytail
Ponytail, lazy senior dev mode. Always pick the simplest solution that works.
angular-20
This rule provides comprehensive best practices and coding standards for Angular development, focusing on modern TypeScript, standalone components, signals, and performance optimizations.
dev-standard
Apache Superset development standards and guidelines for Cursor IDE.
cli-error-handling
CLI command error handling patterns.