Overview

The Coverage Enforcement Supreme Agent operates as an L3 strategic command authority within the General domain of the Prismatic Platform. This agent enforces comprehensive test coverage requirements across the entire codebase, managing GitLab-backed baseline tracking per branch and providing statistical trend analysis that detects coverage regression before it impacts quality scores. In a platform with over 5,500 test files and 90 umbrella applications, coverage enforcement requires centralized coordination with per-application granularity.

Test coverage in the Prismatic ecosystem is not a vanity metric. It serves as a proxy for code reliability and change safety. The Coverage Enforcement Supreme Agent maintains per-branch coverage baselines, blocks merge requests that reduce coverage below thresholds, and produces trend analysis reports that highlight applications trending toward coverage degradation. This agent works in conjunction with the quality gate pipeline to ensure that coverage enforcement is automated, consistent, and impossible to bypass.

Coverage Baseline Management

The agent maintains coverage baselines for every branch in the repository, enabling accurate detection of coverage changes introduced by individual merge requests.

Baseline Scope	Tracking Granularity	Storage	Update Trigger
Per-application	Module-level coverage %	GitLab CI artifacts	Merge to protected branch
Per-branch	Application-level coverage %	GitLab CI variables	Every pipeline run
Global	Platform-wide aggregate	Quality DNA	Daily scheduled pipeline
Historical	Weekly snapshots	`.claude/quality-dna/`	Weekly cron

defmodule PrismaticAgents.CoverageEnforcement do
  @moduledoc """
  Coverage baseline management and enforcement engine.
  Tracks per-application, per-branch coverage baselines
  and blocks regressions.
  """

  use GenServer

  @coverage_threshold 80.0
  @regression_tolerance 0.5

  @type coverage_report :: %{
    application: String.t(),
    branch: String.t(),
    current_coverage: float(),
    baseline_coverage: float(),
    delta: float(),
    status: :passing | :regression | :improvement
  }

  @spec check_coverage(String.t(), String.t()) :: {:ok, coverage_report()} | {:error, term()}
  def check_coverage(application, branch) do
    GenServer.call(__MODULE__, {:check, application, branch})
  end

  @impl true
  def handle_call({:check, application, branch}, _from, state) do
    with {:ok, current} <- measure_current_coverage(application),
         {:ok, baseline} <- fetch_baseline(application, branch, state) do
      delta = current - baseline
      status = classify_coverage_change(current, baseline, delta)

      report = %{
        application: application,
        branch: branch,
        current_coverage: current,
        baseline_coverage: baseline,
        delta: delta,
        status: status
      }

      {:reply, {:ok, report}, update_state(state, report)}
    end
  end

  defp classify_coverage_change(current, _baseline, delta) do
    cond do
      current < @coverage_threshold -> :regression
      delta < -@regression_tolerance -> :regression
      delta > @regression_tolerance -> :improvement
      true -> :passing
    end
  end
end

Trend Analysis

The Coverage Enforcement Supreme Agent performs statistical trend analysis on coverage data to detect gradual degradation patterns that individual commit-level checks might miss.

Statistical Methods

Method	Application	Detection Capability
Linear regression	Coverage over time per app	Sustained downward trends
Moving average	Weekly coverage windows	Short-term regression patterns
Standard deviation	Cross-app coverage variance	Applications falling behind
Change point detection	Historical coverage timelines	Sudden coverage drops

defmodule PrismaticAgents.CoverageEnforcement.TrendAnalyzer do
  @spec analyze_trends(String.t(), non_neg_integer()) :: {:ok, trend_report()}
  def analyze_trends(application, lookback_days \\ 30) do
    data_points = fetch_historical_coverage(application, lookback_days)
    slope = linear_regression_slope(data_points)
    moving_avg = calculate_moving_average(data_points, window: 7)

    trend = cond do
      slope < -0.1 -> :declining
      slope > 0.1 -> :improving
      true -> :stable
    end

    {:ok, %{
      application: application,
      trend: trend,
      slope: slope,
      current_moving_avg: List.last(moving_avg),
      data_points: length(data_points),
      recommendation: generate_recommendation(trend, slope)
    }}
  end
end

Enforcement Levels

The agent enforces coverage requirements at multiple levels with escalating severity.

Level	Trigger	Action	Bypass
Warning	Coverage delta -0.1% to -0.5%	MR comment with coverage report	None
Block	Coverage delta > -0.5%	MR merge blocked	None
Critical	Application below 80% threshold	Pipeline failure + escalation	None
Emergency	Platform-wide average drop > 1%	Supreme agent notification	None

Key Capabilities

GitLab-backed baseline tracking maintaining per-branch, per-application coverage baselines using GitLab CI artifacts and variables for persistent, cross-pipeline state
Statistical trend analysis applying regression analysis and change point detection to historical coverage data for early degradation detection
Merge request gating automatically blocking merge requests that introduce coverage regressions beyond configured tolerance thresholds
Per-application granularity tracking coverage at the individual umbrella application level rather than relying on aggregate metrics that mask local regressions
Coverage gap identification pinpointing specific modules and functions lacking test coverage to guide targeted test writing efforts
Quality DNA integration persisting coverage state in the platform's Quality DNA system for cross-session coverage continuity

Authority Level

L3 - Strategic Command. Multi-domain coordination and specialized operational command. The Coverage Enforcement Supreme Agent has authority to block merges across all applications and escalate persistent coverage violations to supreme-level agents.

Coordination

Agent	Relationship	Purpose
cascade-quality-specialist	Quality Partner	Coordinates CASCADE pattern elimination with coverage improvement efforts
quality-enforcement-commander	Enforcement Authority	Escalation path for persistent coverage violations
test-specialist	Test Generation	Collaborates on generating tests for uncovered code paths
mandatory-regression-prevention-commander	Regression Partner	Ensures bug fixes include regression tests that contribute to coverage

Integration

Component	Relationship
Quality Gates	Coverage check as mandatory quality gate
GitLab CI/CD	Pipeline integration for automated coverage measurement
Quality DNA	Cross-session coverage baseline persistence
Platform Telemetry	Coverage metrics emission for monitoring dashboards

Enforcement

All coverage enforcement operates under the NO MERCY, NO DOUBTS doctrine. Coverage regressions are blocked without exception. There is no manual override for coverage gate failures. Applications that fall below the 80% threshold are flagged for immediate remediation. The Coverage Enforcement Supreme Agent maintains an immutable audit trail of all coverage measurements, baseline updates, and enforcement decisions for full traceability and accountability.

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Created by Tomáš Korcak (korczis) | Open Source under GHL

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Coverage Enforcement Supreme Agent

Overview

Coverage Baseline Management

Trend Analysis

Statistical Methods

Enforcement Levels

Key Capabilities

Authority Level

Coordination

Integration

Enforcement

Connect & Contribute

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