Borrowing it
Nothing to install: this file belongs to islobodan/cruncher-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/islobodan/cruncher-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/islobodan/cruncher-mcpWrote 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/instructions/islobodan/cruncher-mcp/agents-md)<a href="https://agentmods.dev/instructions/islobodan/cruncher-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/islobodan/cruncher-mcp/agents-md/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/instructions/islobodan/cruncher-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/islobodan/cruncher-mcp/agents-md.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 | $0.01968 | $0.01968 |
| Opus 5.5 | $0.00787 | $0.00787 |
| Sonnet 5.5 | $0.00394 | $0.00394 |
| Haiku 4.5 | $0.00197 | $0.00197 |
Grade A, and why
cruncher-mcp AGENTS.md 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 2mo 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 — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Instructions for Cruncher (MCP Server)
You are connected to Cruncher, a highly reliable, accurate, and zero-dependency scientific calculator built over the Model Context Protocol (MCP).
Whenever a user asks you to perform mathematics, statistics, unit conversions, or fetch physical constants, you must use the tools provided by Cruncher rather than relying on your own internal mental math or generating a Python script, as Cruncher guarantees zero hallucination, strict decimal accuracy, and infinite-loop protection.
Server Overview
| Attribute | Value |
|---|---|
| Version | v1.2.31 |
| Total Tools | 43 (full), 34 (standard default), 5 (minimal) |
| Default Tier | standard (34 tools) |
| Protocol Version | 2025-11-25 (latest MCP spec) |
| Timeout | 3 seconds (configurable via CRUNCHER_TIMEOUT env var) |
| Dependencies | Zero (pure Node.js) |
1. Prioritize evaluate_expression for Math
For any non-trivial math, use one call to evaluate_expression instead of chaining individual tools.
Supported in Expression Strings
| Category | Items |
|---|---|
| Operators | +, -, *, /, %, ^ (power) |
| Constants | pi, e, tau, phi, sqrt2, euler_mascheroni, c, g, G, h, k, R, NA, e_charge, m_e, m_p |
| Trig | sin(), cos(), tan(), asin(), acos(), atan() |
| Math | sqrt(), log10(), ln(), log(x, base), abs(), round(), floor(), ceil(), min(), max() |
Examples
evaluate_expression("2 * pi * 5")
evaluate_expression("sin(pi/6) + sqrt(16)")
evaluate_expression("3^3 + abs(-5) / 2")
evaluate_expression("log10(1000) ^ 2")
evaluate_expression("log(16, 2)")
evaluate_expression("1e6 + 2.5e-3")
Constraints
- Letters are only allowed for the constants and function names listed above — no algebraic variables like
x + 2 - Individual trig tool calls (
sine,cosine, etc.) use the global angle mode (default: degrees).evaluate_expressionalways uses radians (JavaScript standard). - Scientific notation:
1e6,2.5e-3both work - Explicit operators required:
2 * piworks,2pidoes not
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.
- 2mo ago First seen · 197 lines · 1,968 tokens per session scan A 8f4ca9306f5d
cruncher-mcp AGENTS.md is an instructions file published in the GitHub repository islobodan/cruncher-mcp (1 stars, last pushed 4mo ago), licensed MIT. It adds 1,968 tokens to every session, about $0.0079 per session on Opus 5.5. 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.
cruncher-mcp AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| cruncher-mcp AGENTS.mdislobodan/cruncher-mcp | Instructions file | 1 | 4mo ago | MIT | A | 1,968 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,649 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| vscode model-prompts.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 2,022 | GitHub Copilot |