diff --git a/packages/paperclip-runner/docs/phase-07-issue-thread-ui.md b/packages/paperclip-runner/docs/phase-07-issue-thread-ui.md
index 0f4f7886878..684f3ff3c28 100644
--- a/packages/paperclip-runner/docs/phase-07-issue-thread-ui.md
+++ b/packages/paperclip-runner/docs/phase-07-issue-thread-ui.md
@@ -168,11 +168,17 @@ Hosts without the Playwright chromium system libraries can either run
 `pnpm --filter @paperclipai/paperclip-runner verify:rootless` or set
 `PAPERCLIP_RUNNER_CHROMIUM_PATH` to a preinstalled Chromium.
 
-The committed PNGs are pinned to the Chromium build listed in the Phase 7G
-verification evidence, so `check:phase7:ui` needs that same browser. Point
-`PAPERCLIP_RUNNER_CHROMIUM_PATH` at it before comparing; a different build makes
-every shot mismatch at once, which reads like a regression but is not one. The
-check prints the Chromium version it recorded with whenever it reports drift.
+The committed PNGs are pinned to the Chromium build and font environment listed
+in `knowledge/evidence/phase-07/ui/index.md`, so `check:phase7:ui` needs that
+same browser and font set. Point `PAPERCLIP_RUNNER_CHROMIUM_PATH` at the
+recorded browser before comparing — and when that path is the agent-browser
+wrapper, also set `PAPERCLIP_CHROMIUM_BIN` to the exact binary, because the
+wrapper otherwise picks the newest installed Playwright Chromium. A different
+build or font set makes every shot mismatch at once, which reads like a
+regression but is not one. The recorder probes that `Inter` resolves distinctly
+from the DejaVu Sans fallback and refuses to record or compare when it does
+not; the drift report prints the Chromium version and font probe it recorded
+with.
 
 ## Accessibility
 
diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/debug-panel-open--desktop.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/debug-panel-open--desktop.png
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index 05ab5db4db6..713fbb6d767 100644
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index 8aef404e140..5afcd0f96da 100644
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index c5fd851d16c..4f33440c7f5 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/document-revision--desktop.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/document-revision--desktop.png
index 8b208b02396..9540e6471be 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/document-revision--mobile.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/document-revision--mobile.png
index 1620e903a76..7c01a909f91 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/index.md b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/index.md
index 66e452c1c81..2a44b42c1bc 100644
--- a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/index.md
+++ b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/index.md
@@ -27,3 +27,12 @@ Deterministic `fake` mode; no provider, runner, or credential is involved.
 - `thread-baseline--mobile.png`
 - `turn-streaming--desktop.png`
 - `turn-streaming--mobile.png`
+
+## Recording environment
+
+- Chromium 151.0.7922.34 — pin the exact binary with `PAPERCLIP_CHROMIUM_BIN`
+  (honoured by the agent-browser wrapper) alongside
+  `PAPERCLIP_RUNNER_CHROMIUM_PATH`.
+- Sans stack resolves to Inter (probe: Inter 549px vs
+  DejaVu Sans 641px for the title string). The recorder
+  refuses to run when Inter does not resolve.
diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/interaction-confirmation-pending--desktop.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/interaction-confirmation-pending--desktop.png
index b99eb10519e..4e1932b9d7d 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/interaction-confirmation-pending--mobile.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/interaction-confirmation-pending--mobile.png
index 1ecd34b0271..d8083a537cb 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/interaction-question-pending--desktop.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/interaction-question-pending--desktop.png
index fcd55cf3654..1978d4e536b 100644
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index 8488dc44628..b3eba793d14 100644
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index aa20b44a2a4..f4ad00075d4 100644
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index 38804c2a4d7..dd9d31e1f07 100644
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index e6aa6383931..7c651e00243 100644
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index 3f211407af5..2e518b4c9e0 100644
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index 83312449b24..e50665e879e 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/thread-baseline--desktop.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/thread-baseline--desktop.png
index f991651de28..4fa0e8d0a13 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/thread-baseline--mobile.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/thread-baseline--mobile.png
index 3f127a9471e..ce8eb00a19e 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/turn-streaming--desktop.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/turn-streaming--desktop.png
index aaa68a944dc..567660b15c3 100644
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-07/ui/turn-streaming--mobile.png b/packages/paperclip-runner/knowledge/evidence/phase-07/ui/turn-streaming--mobile.png
index 2b06ab765e7..701946904aa 100644
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diff --git a/packages/paperclip-runner/scripts/record-phase7-ui-evidence.mjs b/packages/paperclip-runner/scripts/record-phase7-ui-evidence.mjs
index f92c542c166..5a288324083 100644
--- a/packages/paperclip-runner/scripts/record-phase7-ui-evidence.mjs
+++ b/packages/paperclip-runner/scripts/record-phase7-ui-evidence.mjs
@@ -81,6 +81,35 @@ async function startPreview() {
 
 // Set by `record` so a drift report can name the Chromium build that produced it.
 let browserVersion = "unknown";
+let fontProbe = { interWidth: 0, dejavuWidth: 0, interResolves: false };
+
+/**
+ * The committed matrix is recorded with Inter active. When fontconfig cannot
+ * resolve Inter, every text node falls back to DejaVu Sans and all 24 shots
+ * drift at once — refuse to record or compare under that environment instead
+ * of producing a whole-page mystery diff.
+ */
+async function probeFonts(browser) {
+  const context = await browser.newContext();
+  const page = await context.newPage();
+  const probe = await page.evaluate(() => {
+    const canvas = document.createElement("canvas").getContext("2d");
+    const sample = "Wire the runner spike to the mock control plane";
+    const width = (font) => {
+      canvas.font = font;
+      return Math.round(canvas.measureText(sample).width);
+    };
+    const interWidth = width("700 24px Inter");
+    const dejavuWidth = width('700 24px "DejaVu Sans"');
+    return {
+      interWidth,
+      dejavuWidth,
+      interResolves: document.fonts.check("16px Inter") && interWidth !== dejavuWidth,
+    };
+  });
+  await context.close();
+  return probe;
+}
 
 async function record(targetDir) {
   await mkdir(targetDir, { recursive: true });
@@ -92,6 +121,15 @@ async function record(targetDir) {
   browserVersion = browser.version();
   const recorded = [];
   try {
+    fontProbe = await probeFonts(browser);
+    if (!fontProbe.interResolves) {
+      throw new Error(
+        `font environment mismatch: "Inter" does not resolve distinctly ` +
+          `(Inter ${fontProbe.interWidth}px vs DejaVu Sans ${fontProbe.dejavuWidth}px). ` +
+          "The committed matrix is recorded with Inter active; make Inter visible to " +
+          "fontconfig before recording or checking.",
+      );
+    }
     for (const viewport of VIEWPORTS) {
       for (const slug of PHASE7_UI_SHOT_SLUGS) {
         const context = await browser.newContext({
@@ -146,6 +184,15 @@ async function main() {
           "",
           ...manifest.map((name) => `- \`${name}\``),
           "",
+          "## Recording environment",
+          "",
+          `- Chromium ${browserVersion} — pin the exact binary with \`PAPERCLIP_CHROMIUM_BIN\``,
+          "  (honoured by the agent-browser wrapper) alongside",
+          "  `PAPERCLIP_RUNNER_CHROMIUM_PATH`.",
+          `- Sans stack resolves to Inter (probe: Inter ${fontProbe.interWidth}px vs`,
+          `  DejaVu Sans ${fontProbe.dejavuWidth}px for the title string). The recorder`,
+          "  refuses to run when Inter does not resolve.",
+          "",
         ].join("\n"),
         "utf8",
       );
@@ -183,10 +230,12 @@ async function main() {
             "Phase 7 UI evidence is not byte-stable:",
             ...drift,
             "",
-            `Recorded with Chromium ${browserVersion}.`,
-            "Committed PNGs are pinned to one Chromium build. A wholesale mismatch",
-            "usually means a different browser, not a UI regression: set",
-            "PAPERCLIP_RUNNER_CHROMIUM_PATH to the Chromium that recorded them.",
+            `Recorded with Chromium ${browserVersion}; sans probe Inter=${fontProbe.interWidth}px, DejaVu Sans=${fontProbe.dejavuWidth}px.`,
+            "Committed PNGs are pinned to one Chromium build and one font environment.",
+            "A wholesale mismatch usually means a different browser or font set, not a",
+            "UI regression: set PAPERCLIP_RUNNER_CHROMIUM_PATH (and PAPERCLIP_CHROMIUM_BIN",
+            "for the wrapper) to the Chromium that recorded them, and compare the font",
+            "probe against knowledge/evidence/phase-07/ui/index.md.",
             "",
           ].join("\n"),
         );