diff --git a/cli/bin/commands/ignores.mjs b/cli/bin/commands/ignores.mjs
index dc1d6a376..5e0585dfc 100644
--- a/cli/bin/commands/ignores.mjs
+++ b/cli/bin/commands/ignores.mjs
@@ -7,6 +7,7 @@ import {
   readDetectionConfig,
   readRawDetectionConfig,
   writeDetectionConfig,
+  extractFindingIgnoreValue,
 } from '../../lib/impeccable-config.mjs';
 
 const ACTION_ALIASES = new Map([
@@ -235,6 +236,9 @@ function addFile(cwd, args) {
 function addValue(cwd, args) {
   const { local, rest } = parseScope(args);
   const parsed = parseValueArgs(rest);
+  if (parsed.value !== '*' && !extractFindingIgnoreValue({ antipattern: parsed.rule, ignoreValue: parsed.value })) {
+    throw new Error(`${parsed.rule} has no extractable ignore value. Use impeccable ignores add-value ${parsed.rule} "*" --file <glob> to suppress it in matching files.`);
+  }
   const config = readScopeConfig(cwd, local);
   const key = ignoreValueKey(parsed);
   const existing = config.ignoreValues.find((entry) => ignoreValueKey(entry) === key);
diff --git a/skill/scripts/hook-admin.mjs b/skill/scripts/hook-admin.mjs
index 0d8cbaf94..28677c483 100644
--- a/skill/scripts/hook-admin.mjs
+++ b/skill/scripts/hook-admin.mjs
@@ -35,6 +35,7 @@ import {
   ensureHookGitExcludes,
   normalizeIgnoreValue,
   normalizeIgnoreValueEntries,
+  extractFindingIgnoreValue,
 } from './hook-lib.mjs';
 
 const ACTIONS = new Set(['status', 'on', 'off', 'ignore-rule', 'ignore-file', 'ignore-value', 'reset']);
@@ -713,6 +714,10 @@ function addIgnoreValue(cwd, args) {
     throw new Error(`Wildcard value ignores must be scoped with --file <glob>, e.g. ${IMPECCABLE_COMMAND} hooks ignore-value design-system-font-size "*" --file "src/widget.js". To suppress the rule project-wide use ${projectWide}.`);
   }
 
+  if (parsed.value !== '*' && !extractFindingIgnoreValue({ antipattern: parsed.rule, ignoreValue: parsed.value })) {
+    throw new Error(`${parsed.rule} has no extractable ignore value. Use ${IMPECCABLE_COMMAND} hooks ignore-value ${parsed.rule} "*" --file <glob> to suppress it in matching files.`);
+  }
+
   const local = parsed.local;
   const config = mergeDetectorConfig(readRawDetectorConfig(cwd, { local }));
   // Key on the file scope too: the same rule/value legitimately appears more than
diff --git a/tests/cli-ignores.test.js b/tests/cli-ignores.test.js
index 95f676ed4..8049106fb 100644
--- a/tests/cli-ignores.test.js
+++ b/tests/cli-ignores.test.js
@@ -115,6 +115,13 @@ describe('impeccable ignores CLI', () => {
     expect(existsSync(join(root, '.impeccable', 'config.json'))).toBe(false);
   });
 
+  test('rejects exact values for rules that cannot extract one', () => {
+    const result = run(['add-value', 'side-tab', 'Inter']);
+    expect(result.status).not.toBe(0);
+    expect(result.stderr).toMatch(/side-tab has no extractable ignore value.*add-value side-tab "\*" --file <glob>/);
+    expect(existsSync(join(root, '.impeccable', 'config.json'))).toBe(false);
+  });
+
   test('removes an existing broad wildcard value ignore', () => {
     mkdirSync(join(root, '.impeccable'), { recursive: true });
     writeFileSync(join(root, '.impeccable', 'config.json'), JSON.stringify({
diff --git a/tests/hook.test.mjs b/tests/hook.test.mjs
index 15f549e43..e11d3fb62 100644
--- a/tests/hook.test.mjs
+++ b/tests/hook.test.mjs
@@ -819,6 +819,28 @@ describe('hook-admin.mjs', () => {
     assert.equal(fs.existsSync(getConfigPath(cwd)), false, 'a refused ignore must not write config');
   });
 
+  it('ignore-value refuses exact values for rules that cannot extract one', () => {
+    assert.throws(
+      () => runAdmin(['ignore-value', 'cramped-padding', 'padding: 4px 8px']),
+      /cramped-padding has no extractable ignore value.*ignore-value cramped-padding "\*" --file <glob>/,
+    );
+    assert.throws(
+      () => runAdmin(['ignore-value', 'side-tab', 'Inter', '--file', 'a.css']),
+      /side-tab has no extractable ignore value.*ignore-value side-tab "\*" --file <glob>/,
+    );
+    assert.equal(fs.existsSync(getConfigPath(cwd)), false, 'a refused ignore must not write config');
+
+    const out = runAdmin(['ignore-value', 'overused-font', 'Inter']);
+    assert.match(out, /Added overused-font=inter/);
+
+    runAdmin(['ignore-value', 'cramped-padding', '*', '--file', 'index.html']);
+    const shared = JSON.parse(fs.readFileSync(getConfigPath(cwd), 'utf-8')).detector;
+    assert.equal(shared.ignoreValues.filter((e) => e.rule === 'cramped-padding').length, 1);
+    const entry = shared.ignoreValues.find((e) => e.rule === 'cramped-padding');
+    assert.equal(entry.value, '*');
+    assert.deepEqual(entry.files, ['index.html']);
+  });
+
   it('ignore-value --file requires a glob', () => {
     assert.throws(
       () => runAdmin(['ignore-value', 'side-tab', '*', '--file']),