diff --git a/frontend/src/v2/__tests__/V2ConnectorsPage.test.tsx b/frontend/src/v2/__tests__/V2ConnectorsPage.test.tsx
index 94d90b450..a53e88d21 100644
--- a/frontend/src/v2/__tests__/V2ConnectorsPage.test.tsx
+++ b/frontend/src/v2/__tests__/V2ConnectorsPage.test.tsx
@@ -122,6 +122,64 @@ describe('V2ConnectorsPage', () => {
     expect(row?.querySelector('.v2-connector-row__when')).toBeNull();
   });
 
+  // TASK-177. The mark and the Tools glyph agree at 14px through TWO independent
+  // literals in two files: `size={14}` at the mark's call site, and
+  // V2ConnectorTools' own local `G` (`:157`, `width="14" height="14"`) — it does
+  // not import `MarkGlyph`, and `icons/glyphs.tsx`'s `G` defaults to 16.
+  // So nothing shared carries the agreement and nothing tested it: drop the prop
+  // and the mark renders 16 while Tools stays 14, silently desyncing the two rows
+  // v2.css claims cannot drift. And a `14` asserted in one file would have passed
+  // through every misreading of this chain, so what is pinned is the AGREEMENT:
+  // whichever number the design lands on, both glyphs must carry it. The absolute
+  // size stays the gate's decision, not this test's.
+  it('TASK-177: the connector mark and the Tools mode glyph render at the same size', async () => {
+    const toolsEntry = {
+      installableId: 'github', list: 'tools', label: 'GitHub', description: 'Issues and pull requests.', available: true,
+      broker: { id: 'commonly-grant-broker' },
+      tools: [{ name: 'github.list_issues', requiredWriteMode: 'read', irreversible: false }],
+      connections: [],
+    };
+    const grant = {
+      grantId: 'grant_live', installationId: 'inst-1', target: { kind: 'pod', id: 'p1' }, tools: ['github.list_issues'],
+      writeMode: 'read', budget: { calls: 50, windowMs: 3600000 }, effectiveAudience: [],
+      expiresAt: new Date(Date.now() + 6 * 86400000).toISOString(), revokedAt: null, revokedBy: null,
+      parentGrantId: null, rootGrantId: null, createdAt: new Date().toISOString(), grantedBy: 'u1',
+    };
+    axios.get.mockImplementation((url) => {
+      if (url === '/api/integrations/user/all') return Promise.resolve({ data: [connectors[1]] });
+      if (url === '/api/pods') return Promise.resolve({ data: [{ _id: 'p1', name: 'Launch pod', type: 'chat' }] });
+      if (url === '/api/installables') return Promise.resolve({ data: { installables: [toolsEntry] } });
+      if (url === '/api/pods/p1/grants') return Promise.resolve({ data: { podId: 'p1', grants: [grant] } });
+      if (url === '/api/registry/pods/p1/agents') return Promise.resolve({ data: { agents: [] } });
+      if (url.includes('/calls')) {
+        return Promise.resolve({ data: { grantId: 'grant_live', calls: [], counts: { total: 0, ok: 0, refused: 0, pending_approval: 0, failed: 0 } } });
+      }
+      return Promise.resolve({ data: [] });
+    });
+    const { container } = renderPage();
+    // Both glyphs have to actually BE there, or the comparison would pass on two
+    // absent nodes — the vacuity the same-size claim is easiest to fake.
+    const markSvg = await waitFor(() => {
+      expect(container.querySelector('.v2-connector-row__mark svg')).not.toBeNull();
+      return container.querySelector('.v2-connector-row__mark svg') as SVGElement;
+    });
+    const modeSvg = await waitFor(() => {
+      expect(container.querySelector('.v2-tools__mode svg')).not.toBeNull();
+      return container.querySelector('.v2-tools__mode svg') as SVGElement;
+    });
+    // Positive control: these attributes are the instrument, so prove they carry a
+    // value at all (an empty string would make the equality below meaningless).
+    // Both attributes, both glyphs: controlling only `width` left the height
+    // comparison able to pass on null === null — strip `height` from *both* `G`
+    // components and a width-only control stays green (sprint-review's gate).
+    expect(markSvg.getAttribute('width')).toMatch(/^\d+$/);
+    expect(markSvg.getAttribute('height')).toMatch(/^\d+$/);
+    expect(modeSvg.getAttribute('width')).toMatch(/^\d+$/);
+    expect(modeSvg.getAttribute('height')).toMatch(/^\d+$/);
+    expect(markSvg.getAttribute('width')).toBe(modeSvg.getAttribute('width'));
+    expect(markSvg.getAttribute('height')).toBe(modeSvg.getAttribute('height'));
+  });
+
   it('TASK-162: line 3 never repeats the mode word the kicker already carries', async () => {
     // The prefixes lived in the component's defaultValue, which is exactly where
     // they could not be guarded: once the key exists in the catalog the catalog
diff --git a/frontend/src/v2/__tests__/v2-layout-invariants.test.ts b/frontend/src/v2/__tests__/v2-layout-invariants.test.ts
index f20f47ed4..c25dc5a94 100644
--- a/frontend/src/v2/__tests__/v2-layout-invariants.test.ts
+++ b/frontend/src/v2/__tests__/v2-layout-invariants.test.ts
@@ -1860,7 +1860,7 @@ describe('v2 layout invariants (CSS rule presence)', () => {
     expect(sharedMarkRule?.[2]).toContain('display: inline-flex');
     expect(sharedMarkRule?.[2]).toContain('vertical-align: -2px');
     expect(sharedMarkRule?.[2]).toContain('color: var(--v2-text-tertiary)');
-    // Rule 3: the kicker is mono 11; rule 1 (as revised by the TASK-162 gate): the mode word is hidden until 760 and the mark's own 16px rule is GONE — its size now comes from the shared rule above plus the glyph's `size` prop; rule 2: the gear is 32 (44 on the phone).
+    // Rule 3: the kicker is mono 11; rule 1 (as revised by the TASK-162 gate): the mode word is hidden until 760 and the mark's own 16px rule is GONE — the shared rule carries no dimensions, so the size is the glyph's `size` prop alone, pinned same-size against the Tools glyph in V2ConnectorsPage.test.tsx (TASK-177); rule 2: the gear is 32 (44 on the phone).
     expect(ruleBody(v2, '.v2-connector-row__kicker')).toContain('var(--v2-font-mono)');
     expect(ruleBody(v2, '.v2-connector-row__kicker')).toContain('font-size: 11px');
     expect(ruleBody(v2, '.v2-connector-row__kicker-mode')).toContain('display: none');
diff --git a/frontend/src/v2/components/V2ConnectorsPage.tsx b/frontend/src/v2/components/V2ConnectorsPage.tsx
index 57487b2bb..27002a00e 100644
--- a/frontend/src/v2/components/V2ConnectorsPage.tsx
+++ b/frontend/src/v2/components/V2ConnectorsPage.tsx
@@ -1067,8 +1067,11 @@ const V2ConnectorsPage: React.FC = () => {
               // TASK-162 (3): the consequence is the visible words; the mode word
               // (mirror / attention / relay off) is what the glyph itself means,
               // so it rides title + aria-label rather than being the only thing
-              // on the line. The glyph rides .v2-tools__mode's 14px rule (see
-              // v2.css): #1782 says the channel mark follows the Tools glyph.
+              // on the line. The glyph's 14px is THIS call site's `size` prop — no
+              // rule carries it (the shared rule with .v2-tools__mode is layout and
+              // colour only), so a same-size pin in V2ConnectorsPage.test.tsx holds
+              // it to the Tools glyph's own 14 (TASK-177). #1782 says the channel
+              // mark follows the Tools glyph.
               <span className="v2-connector-row__detail">
                 <span className="v2-connector-row__mark" title={row.mark.word} role="img" aria-label={row.mark.word}><MarkGlyph name={row.mark.name} size={14} /></span>
                 <span className="v2-connector-row__mark-text">{row.mark.label}</span>
diff --git a/frontend/src/v2/v2.css b/frontend/src/v2/v2.css
index ffeeefe59..3a4071f47 100644
--- a/frontend/src/v2/v2.css
+++ b/frontend/src/v2/v2.css
@@ -9951,9 +9951,13 @@ body.modern-ui.v2-canvas {
    reachable only through the glyph's tooltip — and at ≤760 the mark is hidden,
    so line 3 disappeared entirely on a phone. The consequence is now TEXT beside
    the mark; the mode word moved onto the mark itself (title + aria-label), and
-   the glyph itself follows #1782: it takes the Tools glyph's rule below (14px,
-   gap 6, tertiary, vertical-align -2px) rather than a 16px rule of its own,
-   because beside a 12/16 mono sentence a 16px mark grows the line box to 18px. */
+   the glyph follows #1782 — it takes the Tools glyph's rule below for layout and
+   colour (gap 6, tertiary, vertical-align -2px) rather than a rule of its own.
+   That rule carries NO dimensions: the 14px is `size={14}` on the call site,
+   held equal to the Tools glyph's own hardcoded 14 (V2ConnectorTools' local `G`)
+   by a same-size pin in V2ConnectorsPage.test.tsx (TASK-177). 16px would grow the
+   line box to 18px beside a 12/16 mono sentence, which is why it is 14 and not
+   the glyph's 16 default. */
 /* TASK-162 (2): the not-yet row lists two channels. Above 760 they stack in the
    140px name track; at ≤760 they join with ' · ' (the separator is the only
    element that switches, so nothing here depends on generated content). */
@@ -9966,7 +9970,10 @@ body.modern-ui.v2-canvas {
 .v2-connector-row__kicker-mode { display: none; }
 /* Direction A rule 1 (as revised by TASK-162): a category on the row is a mark,
    the sentence in title + aria-label — and the mark shares the Tools glyph's rule
-   (search `.v2-connector-row__mark, .v2-tools__mode`) so the two rows cannot drift. */
+   (search `.v2-connector-row__mark, .v2-tools__mode`) for layout and colour. That
+   sharing does NOT carry the size: the two agree at 14px through two independent
+   literals in two files, so a same-size pin in V2ConnectorsPage.test.tsx is what
+   keeps them from drifting (TASK-177). */
 .v2-root button.v2-connector-row__action,
 .v2-root a.v2-connector-row__action {
   justify-self: end;