feat(coverage): default to text reporter skipFull if agent detected

docs/config/coverage.md

@@ -133,6 +133,10 @@ You can also pass custom coverage reporters. See [Guide - Custom Coverage Report
 
 You can check your coverage report in Vitest UI: check [Vitest UI Coverage](/guide/coverage#vitest-ui) for more details.
 
+::: tip AI coding agents
+When Vitest detects it is running inside an AI coding agent, it automatically adds the `text-summary` reporter and sets `skipFull: true` on the `text` reporter to reduce output and minimize token usage.
+:::
+
 ## coverage.reportOnFailure {#coverage-reportonfailure}
 
 - **Type:** `boolean`

docs/guide/coverage.md

@@ -508,3 +508,12 @@ This is integrated with builtin coverage reporters with HTML output (`html`, `ht
 
 <img alt="html coverage in Vitest UI" img-light src="/ui-coverage-1-light.png">
 <img alt="html coverage in Vitest UI" img-dark src="/ui-coverage-1-dark.png">
+
+## Coverage in Agent Environments
+
+When Vitest detects it is running inside an AI coding agent, it automatically adjusts the default `text` reporter to reduce output and minimize token usage:
+
+- `skipFull: true` is set on the `text` reporter, so files with 100% coverage are omitted from the terminal output.
+- The [`text-summary`](/config/coverage#coverage-reporter) reporter is added automatically, so the agent always sees a concise totals table even when `skipFull` hides all individual files.
+
+These adjustments only apply when the `text` reporter is already part of the active reporter list (it is included in the default). Explicitly configured reporters are never removed.

packages/vitest/src/node/config/resolveConfig.ts

@@ -428,6 +428,17 @@ export function resolveConfig(
   }
 
   resolved.coverage.reporter = resolveCoverageReporters(resolved.coverage.reporter)
+  if (isAgent) {
+    // default to `skipFull` and add `text-summary` reporter when `text` reporter is used on agents
+    const text = resolved.coverage.reporter.find(([name]) => name === 'text')
+    const textSummary = resolved.coverage.reporter.find(([name]) => name === 'text-summary')
+    if (text) {
+      (text as any)[1] = { skipFull: true, ...text[1] as any }
+      if (!textSummary) {
+        resolved.coverage.reporter.push(['text-summary', {}])
+      }
+    }
+  }
   if (resolved.coverage.changed === undefined && resolved.changed !== undefined) {
     resolved.coverage.changed = resolved.changed
   }