CalculatorSAFE
A Model Context Protocol server for calculating.
Overview
From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.
A Model Context Protocol server for calculating. This server enables LLMs to use calculator for precise numerical calculations.
Available Tools
calculate- Calculates/evaluates the given expression.expression(string, required): Expression to be calculated
Installation
Using uv (recommended)
When using `uv` no specific installation is needed. We will use `uvx` to directly run mcp-server-calculator.
curl -LsSf https://astral.sh/uv/install.sh | sh
Using PIP
Alternatively you can install mcp-server-calculator via pip:
pip install mcp-server-calculator
After installation, you can run it as a script using:
python -m mcp_server_calculator
Configuration
Using uv (recommended)
Add this to your MCP client settings:
"mcpServers": {
"calculator": {
"command": "uvx",
"args": ["mcp-server-calculator"]
}
}Using PIP
Alternatively add this to your MCP client settings:
"mcpServers": {
"calculator": {
"command": "python",
"args": ["-m", "mcp_server_calculator"]
}
}License
mcp-server-calculator is licensed under the MIT License. This means you are free to use, modify, and distribute the software, subject to the terms and conditions of the MIT License. For more details, please see the LICENSE file in the project repository.
5c3f7cb04d15OBSERVED · 2026-10-07Connect
Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control.
claude mcp add mcp-server-calculator -- uvx mcp-server-calculator
{
"mcpServers": {
"mcp-server-calculator": {
"command": "uvx",
"args": [
"mcp-server-calculator"
]
}
}
}Exposed tools (1)
1 read · 0 write · 0 destructive.
| Tool | Risk | Description |
|---|---|---|
calculate | read | Calculates/evaluates the given expression. |
Trust audit
SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.
| Layer | What it checks | Result |
|---|---|---|
| L0 | Provenance & inventory | PASS |
| L1 | Static analysis of the code | PASS |
| L2 | Instruction surface (what it tells the agent) | PASS |
| L3 | Class-specific surface | PASS |
| L4 | Behavioural (sandbox) | SKIPPED |
What the source does
- Filesystem
- none-observed
- Network
- none-observed
- Shell
- none-observed
- Dependencies
- pinned
- Secrets in source
- none-found
Findings (1)
curl -LsSf https://astral.sh/uv/install.sh | sh
Gates applied: no_behavioural_pass.
5c3f7cb04d15full audit observations/trust-audit/mcp-server/githejie__calculator.json · Report an issue / request a re-scanAudit history
Every audit this server has had. A grade with a past is a grade somebody is still checking.
| Date | Source | Verdict | Grade | Score | Change |
|---|---|---|---|---|---|
| 2026-10-07 | 5c3f7cb04d15 | SAFE | B | 89 | first audit |
Questions
What is the Calculator MCP server?
A Model Context Protocol server for calculating.
What tools does Calculator expose?
1 in total: 1 read-only, 0 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.
Is Calculator safe to connect to an agent?
The audit found nothing in the source that contradicts what it says it does, and graded it B (89/100). Grade A is held back for packages that have also passed a sandboxed behavioural run, which is why a clean server reads B.
What credentials does Calculator need?
No credential environment variables were found in its source, so it appears to need none.
How current is this page?
The grade is for one exact copy of the source (5c3f7cb04d15), read on 2026-10-07. The repository is watched and re-audited when it changes.