diff --git a/docs/development/agent-workflow.md b/docs/development/agent-workflow.md
index 42cb09109..11b549f78 100644
--- a/docs/development/agent-workflow.md
+++ b/docs/development/agent-workflow.md
@@ -69,7 +69,7 @@ Image and media references require a nonempty path that resolves to a file, not
 Direct file URLs and file-scheme HTML bases are rejected; use portable repository-relative paths.
 Image references check file existence without interpreting image fragments as
 Markdown headings; document links keep anchor checks even when sharing a target.
-HTML video, audio, source and track `src` assets and video posters use the same
+HTML image-input, video, audio, source and track `src` assets and video posters use the same
 existence checks as images. Entity decoding uses full HTML text/attribute rules,
 including references whose semicolon may be omitted.
 Inline guidance imports are rejected after punctuation as well as whitespace.
@@ -77,7 +77,7 @@ At-signs inside external URIs (including explicit opaque autolinks such as mailt
 per HTML text node, preserving adjacent imports. A colon directly before an import
 does not make that import a URI. Opaque schemes are excluded only in parsed links
 whose visible text equals their URI, so colon-labeled prose remains checked.
-A closing bracket or quote followed by punctuation and an at-sign terminates a bare URL exclusion.
+A closing bracket or matching enclosing quote followed by punctuation and an at-sign terminates a bare URL exclusion.
 Extensionless inline candidates are also imports when they resolve to repository files,
 checking the full filename before prefixes at ASCII/Unicode prose separators,
 including opening parentheses, brackets and braces. Each at-sign candidate is
@@ -88,7 +88,7 @@ rejected before those exemptions, including document paths with fragments or que
 All recognized Markdown extensions share the document-import guard; reStructuredText
 and AsciiDoc, PDF, Word, OpenDocument, RTF, Org and TeX documents are also excluded
 from package exemptions. Recognized extensionless guidance names (including AGENTS,
-CLAUDE, INSTRUCTIONS and README) are excluded in package subpaths too. URL-encoded
+CLAUDE, INSTRUCTIONS and README, case-insensitively) are excluded in package subpaths too. URL-encoded
 paths do not receive package exemptions. TypeScript configuration is parsed as JSONC.
 Declared packages also permit safe subpaths; exact aliases stay exact.
 Declared package mentions may include a version (including semver comparators and wildcard ranges) or dist-tag qualifier.
diff --git a/tools/skills/agent-guidance-markdown.mjs b/tools/skills/agent-guidance-markdown.mjs
index a903180c6..5f697c1b9 100644
--- a/tools/skills/agent-guidance-markdown.mjs
+++ b/tools/skills/agent-guidance-markdown.mjs
@@ -90,7 +90,14 @@ function htmlNavigation(html, inspect = () => {}) {
                 ].includes(node.tagName) &&
                     attribute.name === 'src') ||
                 (node.tagName === 'video' && attribute.name === 'poster') ||
-                (node.tagName === 'object' && attribute.name === 'data')
+                (node.tagName === 'object' && attribute.name === 'data') ||
+                (node.tagName === 'input' &&
+                    attribute.name === 'src' &&
+                    node.attrs.some(
+                        (attr) =>
+                            attr.name === 'type' &&
+                            attr.value.toLowerCase() === 'image'
+                    ))
             )
                 references.push({
                     target: attribute.value
@@ -141,7 +148,7 @@ function htmlNavigation(html, inspect = () => {}) {
 }
 
 export function guidanceProse(markdown) {
-    function text(node) {
+    function text(node, preceding = '') {
         if (
             ['script', 'style', 'template', 'pre', 'code'].includes(
                 node.tagName
@@ -163,10 +170,29 @@ export function guidanceProse(markdown) {
         }
         if (node.nodeName === '#text')
             return node.value.replace(
-                /(?:\b[a-z][a-z\d+.-]*:\/\/|\/\/)[^\s]*?(?=[)\]}>"'”’][.,;:!?]*@|\s|$)/giu,
-                ' '
+                /(?:\b[a-z][a-z\d+.-]*:\/\/|\/\/)[^\s]*?(?=[)\]}>][.,;:!?]*@|\s|$)/giu,
+                (url, offset) => {
+                    const opening = (
+                        preceding + node.value.slice(0, offset)
+                    ).at(-1);
+                    const closing = {
+                        '"': '"',
+                        "'": "'",
+                        '“': '”',
+                        '”': '”',
+                        '‘': '’',
+                        '’': '’',
+                    }[opening];
+                    const boundary = closing ? url.indexOf(closing) : -1;
+                    return boundary >= 0 &&
+                        /^[.,;:!?]*@/u.test(url.slice(boundary + 1))
+                        ? ' ' + url.slice(boundary)
+                        : ' ';
+                }
             );
-        const content = (node.childNodes ?? []).map(text).join('');
+        let content = '';
+        for (const child of node.childNodes ?? [])
+            content += text(child, preceding + content);
         return [
             'address',
             'article',
diff --git a/tools/skills/validate-agent-guidance.mjs b/tools/skills/validate-agent-guidance.mjs
index f500c4e24..1af1f3a17 100644
--- a/tools/skills/validate-agent-guidance.mjs
+++ b/tools/skills/validate-agent-guidance.mjs
@@ -166,7 +166,7 @@ async function packageMentions(rootDir) {
         if (
             /%[\da-f]{2}/iu.test(token) ||
             MARKDOWN_EXTENSION.test(path) ||
-            /(?:^|\/)(?:AGENTS|CLAUDE|INSTRUCTIONS|README|LICENSE|LICENCE|NOTICE|COPYING|AUTHORS|CONTRIBUTORS|CHANGELOG)$/u.test(
+            /(?:^|\/)(?:AGENTS|CLAUDE|INSTRUCTIONS|README|LICENSE|LICENCE|NOTICE|COPYING|AUTHORS|CONTRIBUTORS|CHANGELOG)$/iu.test(
                 path
             ) ||
             DOCUMENT_EXTENSION.test(path)
diff --git a/tools/skills/validate-agent-guidance.test.mjs b/tools/skills/validate-agent-guidance.test.mjs
index 84dfd50df..ea7364c92 100644
--- a/tools/skills/validate-agent-guidance.test.mjs
+++ b/tools/skills/validate-agent-guidance.test.mjs
@@ -1630,3 +1630,42 @@ for (const embedded of [false, true]) {
         );
     });
 }
+
+for (const url of [
+    "https://example.com/don't@docs/guide.md",
+    "https://example.com/path'@docs/guide.md",
+]) {
+    test(`internal URL apostrophe remains URL prose: ${url}`, async (t) => {
+        assert.deepEqual(await diagnostics(t, { 'AGENTS.md': url }), []);
+    });
+}
+for (const name of ['readme', 'instructions', 'Agents']) {
+    test(`guidance basename matching ignores case: ${name}`, async (t) => {
+        assert.ok(
+            (
+                await diagnostics(t, {
+                    'package.json': JSON.stringify({
+                        dependencies: { '@angular/core': '*' },
+                    }),
+                    'CLAUDE.md':
+                        '@AGENTS.md\n\nRead @angular/core/docs/' + name,
+                })
+            ).some((message) => message.includes('additional or inline'))
+        );
+    });
+}
+test('image input source is validated', async (t) => {
+    assert.ok(
+        (
+            await diagnostics(t, {
+                'AGENTS.md': '<input type="IMAGE" src="missing.png">',
+            })
+        ).length > 0
+    );
+    assert.deepEqual(
+        await diagnostics(t, {
+            'AGENTS.md': '<input type="text" src="missing.png">',
+        }),
+        []
+    );
+});