expression-evaluator Connector for AI agents.
1 live capability
Get precise algebraic calculations without the risk of code injection.
Waiting for input…
Why people use expression-evaluator
Deterministic Math Expression Evaluator for Secure Algebraic Parsing
With this Connector, your agent handles the math directly. It parses the string, follows PEMDAS, and returns the answer in one step.
What Vinkius changes
That your agent gets perfect math results without any security risks.
Use it from Claude, ChatGPT, Cursor or another AI client you already have.
One account · 6,100+ Connectors
- Real-world use case 01
Verifying physics formulas
A developer asks the agent to solve a physics equation like sqrt(144) / 2 and gets the exact result of 6.
- Real-world use case 02
Mortgage and loan calculations
A user needs a loan calculation.
- Real-world use case 03
Checking student homework
A student wants to check homework.
Complete set · 1capability
The complete expression-evaluator capability set.
These are the exact actions your AI can choose when you ask it to work with expression-evaluator.
01
1 capability in this set.
Part of 1 available through expression-evaluator.
- 01 Capability
Evaluate math
Send a math string to get a precise numerical result using a secure parser. This prevents your agent from making mistakes on complex algebra.
Set up in minutes
One URL. Then ask expression-evaluator to work.
Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use expression-evaluator from the conversation.
Choose your client
Live previewAdvanced clients IDE · CLI
Claude · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_AgwU5vOr68LRTTxf1lGQM9MsmS2e8aYldzAcaQHV/mcp - Step 01
Open Connectors
In Claude Web or Claude Desktop, open Settings and choose Connectors.
- Step 02
Add the URL
Choose Add custom connector, name it expression-evaluator, and paste the URL above.
- Step 03
Turn it on in chat
Select +, open Connectors, and enable expression-evaluator for the conversation.
ChatGPT · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_AgwU5vOr68LRTTxf1lGQM9MsmS2e8aYldzAcaQHV/mcp - Step 01
Open MCP settings
On desktop, open Settings and MCP servers. On web, open your workspace app or connector settings.
- Step 02
Add the URL
Choose Add server with Streamable HTTP, or create a custom MCP app, then paste the expression-evaluator URL.
- Step 03
Save and start
Save the connection and enable expression-evaluator in your conversation. Desktop may ask you to restart once.
Cursor · IDE configuration
Advanced setup
{
"mcpServers": {
"deterministic-math-expression-evaluator": {
"url": "https://edge.vinkius.com/vk_preview_AgwU5vOr68LRTTxf1lGQM9MsmS2e8aYldzAcaQHV/mcp"
}
}
}- Step 01
Open MCP Settings
Press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → search "MCP Settings"
- Step 02
Add the server config
Paste the JSON configuration above into the mcp.json file that opens
- Step 03
Save the file
Cursor will automatically detect the new Connector
- Step 04
Start using expression-evaluator
Open Agent mode in chat and ask: "Using expression-evaluator, help me...". 1 tools available
VS Code Copilot · IDE configuration
Advanced setup
{
"mcpServers": {
"deterministic-math-expression-evaluator": {
"url": "https://edge.vinkius.com/vk_preview_AgwU5vOr68LRTTxf1lGQM9MsmS2e8aYldzAcaQHV/mcp"
}
}
}- Step 01
Create MCP config
Create a .vscode/mcp.json file in your project root
- Step 02
Add the server config
Paste the JSON configuration above
- Step 03
Enable Agent mode
Open GitHub Copilot Chat and switch to Agent mode using the dropdown
- Step 04
Start using expression-evaluator
Ask Copilot: "Using expression-evaluator, help me...". 1 tools available
Windsurf · IDE configuration
Advanced setup
{
"mcpServers": {
"deterministic-math-expression-evaluator": {
"url": "https://edge.vinkius.com/vk_preview_AgwU5vOr68LRTTxf1lGQM9MsmS2e8aYldzAcaQHV/mcp"
}
}
}- Step 01
Open MCP Settings
Go to Settings → MCP Configuration or press Cmd+Shift+P and search "MCP"
- Step 02
Add the server
Paste the JSON configuration above into mcp_config.json
- Step 03
Save and reload
Windsurf will detect the new server automatically
- Step 04
Start using expression-evaluator
Open Cascade and ask: "Using expression-evaluator, help me...". 1 tools available
Cline · IDE configuration
Advanced setup
{
"mcpServers": {
"deterministic-math-expression-evaluator": {
"url": "https://edge.vinkius.com/vk_preview_AgwU5vOr68LRTTxf1lGQM9MsmS2e8aYldzAcaQHV/mcp"
}
}
}- Step 01
Open Cline MCP Settings
Click the Connectors icon in the Cline sidebar panel
- Step 02
Add remote server
Click "Add Connector" and paste the configuration above
- Step 03
Enable the server
Toggle the server switch to ON
- Step 04
Start using expression-evaluator
Ask Cline: "Using expression-evaluator, help me...". 1 tools available
Claude Code · Terminal command
Advanced setup
claude mcp add deterministic-math-expression-evaluator --transport http "https://edge.vinkius.com/vk_preview_AgwU5vOr68LRTTxf1lGQM9MsmS2e8aYldzAcaQHV/mcp"- Step 01
Install Claude Code
Run npm install -g @anthropic-ai/claude-code if not already installed
- Step 02
Add the Connector
Run the command above in your terminal
- Step 03
Verify the connection
Run claude mcp to list connected servers, or type /mcp inside a session
- Step 04
Start using expression-evaluator
Ask Claude: "Using expression-evaluator, show me...". 1 tools are ready
Where the request belongs
Work expression-evaluator can move forward.
This is for developers building math-heavy apps, data scientists who need precise calculations, and engineers who want to stop AI hallucinations in technical workflows.
Software Engineer
You're building a calculator app and want to avoid using the dangerous eval function in your backend.
Data Analyst
You need to verify complex formulas in a spreadsheet and want the AI to provide 100% accurate numbers.
Educational App Developer
You're creating a math tutor and need the AI to provide perfect answers to student homework.
Build the capability set
Add more capabilities.
Each Connector adds new actions and data without changing how you work.
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Solve math, science, and engineering queries with computational intelligence.
Bring your own AI
Change the model, client or framework. Keep expression-evaluator connected.
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Claude -
ChatGPT -
Gemini -
Cursor -
VS Code -
Windsurf -
ZCode -
Cline -
Zed -
Continue -
Kiro -
Roo Code -
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Void -
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Amazon Q -
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Jan -
LM Studio -
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Open WebUI -
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Cherry Studio -
LibreChat -
TypingMind -
Chorus -
5ire -
n8n -
LangChain -
LlamaIndex -
CrewAI -
Vercel AI SDK
Before you connect
Questions about expression-evaluator.
The practical details behind the request, access and result.
Does the Deterministic Math Expression Evaluator support trig functions?
Yes, it supports common trigonometry functions like sin, cos, and tan, along with log and sqrt.
Is it safe to use with user input?
Yes, it is very safe. It uses a strict AST parser rather than executing code, which prevents injection attacks.
Can it handle nested parentheses?
Yes, it can handle complex nested parentheses and follow the correct order of operations every time.
Will it make mistakes on order of operations?
No, it follows the standard PEMDAS rules strictly, ensuring that your math results are always accurate.
What happens if I give it a non-math string?
The engine will recognize the invalid characters and return an error instead of trying to execute the text.
Do I need to install extra libraries?
No, this Connector is zero-dependency, so it runs quickly without needing any extra packages.
Why not just use the standard JavaScript `eval()` function?
Using eval() exposes your agentic infrastructure to remote code execution (RCE) vulnerabilities. If a user prompts the AI to evaluate process.exit(), eval() will shut down your server. This Connector parses strings into an Abstract Syntax Tree (AST), making malicious execution impossible.
Does it support complex nested parentheses?
Yes. The recursive descent parser handles infinite levels of nested parentheses, ensuring the core order of operations (PEMDAS) is strictly enforced.
What happens if there's a division by zero?
The math engine intercepts infinite states like Division by Zero or invalid syntax, safely returning a gracefully handled error string rather than crashing the capability.
One connection away
Give your agent a direct line to expression-evaluator.
Connect expression-evaluator once. Keep it beside 6,100+ managed Connectors when the next task needs more.
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