# Coverage Gate Evaluator MCP for AI Agents. MCP

> Coverage Gate Evaluator enforces strict code coverage thresholds using deterministic integer math to prevent precision errors in your testing pipeline.

## Overview
- **Category:** quality-assurance
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/vk_preview_wwrBixc8Bp00T2IpU9LtNT2x0wbnwiUonWEpYK4B/mcp
- **Tags:** coverage, testing, ci-cd, qa, metrics

## Description

You're tired of seeing builds fail because a floating-point error made 80% look like 79.9%. This MCP handles coverage thresholds using deterministic integer math, so your quality gates are actually reliable. When you connect through Vinkius, your agent can instantly check reports against your specific rules. It takes the guesswork out of whether a pull request meets your standards.

## Tools

### calculate_threshold_shortfall
Tells you exactly what percentage of coverage is still missing to hit your target. It's great for planning your next testing sprint.

### evaluate_coverage_report
Compares your current test results against a list of rules. Use this to decide if a build should pass or fail.

### parse_coverage_rule
Breaks down a text-based rule into its metric and threshold components. It makes it easy for your agent to understand complex requirements.

## Prompt Examples

**Prompt:** 
```
Does my current report pass the 80% line coverage rule?
```

**Response:** 
```
**Status: PASS**

Your line coverage is currently **80%**, which meets the required threshold.
```

**Prompt:** 
```
I'm at 75% branch coverage but need 90%. How much more do I need?
```

**Response:** 
```
You are short by **15%**. You'll need to increase your branch coverage from 75% to 90% to pass the gate.
```

**Prompt:** 
```
Break this rule into parts: 'line_coverage >= 85'.
```

**Response:** 
```
- **Metric**: line_coverage
- **Operator**: >=
- **Threshold**: 85
```

## Capabilities

### Parse rule strings into usable metrics
Breaks down text-based threshold requirements into parts your agent understands.

### Compare coverage reports against thresholds
Checks your current test results against a specific set of quality rules.

### Calculate exact coverage shortfalls
Tells you exactly how much more testing is required to hit your target.

### Enforce strict quality gates in CI/CD
Automates the pass/fail decision for pull requests based on coverage data.

### Prevent floating-point math errors
Uses integer arithmetic to ensure consistent results across all environments.

## Use Cases

### A developer pushes a PR that drops branch coverage
The agent flags the drop immediately, preventing the merge until tests are added.

### An engineer needs to know how much more testing is required
Using `calculate_threshold_shortfall`, they identify exactly which modules need more coverage.

### Automating the parsing of complex rule sets
The agent reads a list of strings and prepares them for evaluation against current reports.

### Auditing historical coverage trends
An architect compares recent build results against strict organizational mandates.

## Benefits

- Stop dealing with flaky builds caused by imprecise coverage math.
- Use `evaluate_coverage_report` to verify every PR against your thresholds.
- Get exact numbers on what's missing using `calculate_threshold_shortfall`.
- Automate rule interpretation with `parse_coverage_rule` for cleaner automation.
- Ensure consistent testing standards across all your projects via Vinkius.

## How It Works

The bottom line is you get mathematically certain coverage enforcement without manual math.

1. Connect the Coverage Gate Evaluator to your AI client via Vinkius.
2. Provide your coverage report data and rule strings to your agent.
3. Receive a precise pass/fail result with any necessary shortfall amounts.

## Frequently Asked Questions

**How does Coverage Gate Evaluator handle coverage math?**
It uses deterministic integer arithmetic. This prevents the rounding errors that often cause floating-point numbers to fail threshold checks.

**Can I use Coverage Gate Evaluator to check branch coverage?**
Yes, you can evaluate any coverage metric, including line and branch coverage, against your defined rules.

**Does Coverage Gate Evaluator work with Claude or Cursor?**
Yes, it works with any MCP-compatible client like Claude, Cursor, or Windsurf.

**How do I know if my build passed using Coverage Gate Evaluator?**
Your agent will evaluate the report against your rules and provide a clear pass or fail result based on the math.

**What happens if my rule is formatted incorrectly?**
You should use `parse_coverage_rule` first to ensure the string is correctly broken down into its parts before evaluation.

**How does the server calculate coverage percentages?**
The server uses deterministic integer math. It calculates the percentage by determining how many times the total number of units fits into the covered count, scaled to a base of one hundred.

**Can I use this with my existing CI/CD pipeline?**
Yes. You can integrate the `evaluate_report_tool` into your CI/CD workflows to automatically fail builds if coverage falls below your specified thresholds.

**What happens if the total number of units is zero?**
If the sum of covered and missed units is zero, the tool will return an error to prevent division by zero errors during calculation.