diff --git a/.github/scripts/Test-SkillIndex.ps1 b/.github/scripts/Test-SkillIndex.ps1
index ab560067..f4b48eeb 100644
--- a/.github/scripts/Test-SkillIndex.ps1
+++ b/.github/scripts/Test-SkillIndex.ps1
@@ -110,9 +110,12 @@ try {
         throw 'A knowledge-only request must exclude review actions.'
     }
     # Entry applies READ's non-empty technology intersection to indexed actions.
-    $alKnowledge = @($knowledgeCandidates | Where-Object { 'al' -in $_.filters.technologies })
-    if ($alKnowledge.Count -ne 1 -or $alKnowledge[0].id -ne 'al-knowledge') {
-        throw 'Entry must admit knowledge-query with technologies: [al].'
+    # Control add-in consultations may supply only JavaScript context.
+    foreach ($technology in 'al', 'javascript') {
+        $admitted = @($knowledgeCandidates | Where-Object { $technology -in $_.filters.technologies })
+        if ($admitted.Count -ne 1 -or $admitted[0].id -ne 'al-knowledge') {
+            throw "Entry must admit knowledge-query with technologies: [$technology]."
+        }
     }
     foreach ($dimension in 'bc-version', 'countries', 'application-area') {
         $expected = if ($dimension -eq 'countries') { 'w1' } else { 'all' }
diff --git a/.github/scripts/test_knowledge_response_semantics.py b/.github/scripts/test_knowledge_response_semantics.py
index 42a79912..93c5c46b 100644
--- a/.github/scripts/test_knowledge_response_semantics.py
+++ b/.github/scripts/test_knowledge_response_semantics.py
@@ -265,6 +265,27 @@ def test_duplicate_read_evidence(self):
         self.evidence["reads"].append(copy.deepcopy(self.evidence["reads"][0]))
         self.assertTrue(self.errors())
 
+    def test_duplicate_citation_with_contradictory_applicability(self):
+        duplicate = copy.deepcopy(self.response["references"][0])
+        duplicate.update(applicability="conditional", unknown=["bc-version"])
+        self.response["references"].append(duplicate)
+        self.assertEqual(self.errors(), [f"Duplicate citation path: {self.path}"])
+
+    def test_cited_article_cannot_be_suppressed(self):
+        for reason in ("layer-precedence", "configuration"):
+            with self.subTest(reason=reason):
+                response = copy.deepcopy(self.response)
+                response["suppressed"] = [{"path": self.path, "reason": reason}]
+                errors = module.validate_response(response, question=self.question, root=self.root,
+                    evidence=self.evidence, run_id="test-run")
+                self.assertEqual(errors, [f"Path is both cited and suppressed: {self.path}"])
+
+    def test_duplicate_suppression_path(self):
+        self.response.update(outcome="no-knowledge", references=[], suppressed=[
+            {"path": self.path, "reason": "layer-precedence"},
+            {"path": self.path, "reason": "configuration"}])
+        self.assertEqual(self.errors(evidence=False), [f"Duplicate suppression path: {self.path}"])
+
     def test_cli_preserves_question_and_rejects_changes(self):
         question = self.root / "question.txt"
         question.write_bytes(self.question.encode())
diff --git a/docs/knowledge-response-validation.md b/docs/knowledge-response-validation.md
index 49b4c659..ba812a34 100644
--- a/docs/knowledge-response-validation.md
+++ b/docs/knowledge-response-validation.md
@@ -80,8 +80,10 @@ python tools/validate_knowledge_response.py response.json `
 
 The tool checks the response schema, exact question, existing canonical citation
 paths within the corpus, and complete-read evidence with matching current file
-hashes and byte counts. A changed article, truncated read, missing evidence,
-different-layer path with the same filename, or mismatched run is rejected.
+hashes and byte counts. Each article path may appear only once across
+`references` and `suppressed`. A changed article, truncated read, missing
+evidence, different-layer path with the same filename, mismatched run, duplicate
+path, or article both cited and suppressed is rejected.
 The tool never repairs or rewrites the response.
 
 Exit codes: `0` means these checks passed, `1` means validation failed, and `2`
diff --git a/docs/troubleshooting.md b/docs/troubleshooting.md
index 66164717..1da23b00 100644
--- a/docs/troubleshooting.md
+++ b/docs/troubleshooting.md
@@ -13,8 +13,9 @@ start with `/`.
 | The CLI has no `plugin` command | Update Copilot CLI using its installation method. Confirm `copilot plugin --help` works. |
 | Sign-in, entitlement, or organization-policy error | Start `copilot`, use `/login`, and confirm your account is allowed to use Copilot CLI. Ask your administrator about organization restrictions; BCQuality cannot override them. |
 | Plugin installation cannot reach the repository | Confirm access to `https://github.com/microsoft/BCQuality` and follow your organization's proxy/network guidance. Do not disable certificate checks. |
-| The plugin installed, but the skill is missing | Run `copilot plugin list` in the terminal. Enable it with `copilot plugin enable bcquality` if disabled, then start a new session. In the session, use `/skills list` and look for `al-code-review` and `al-plan-guidance`. If only `al-code-review` appears, run `copilot plugin update bcquality`. |
+| The plugin installed, but the skill is missing | Run `copilot plugin list` in the terminal. Enable it with `copilot plugin enable bcquality` if disabled, then start a new session. In the session, use `/skills list` and look for `al-code-review`, `al-knowledge`, and `al-plan-guidance`. If `al-knowledge` or `al-plan-guidance` is missing, run `copilot plugin update bcquality`, then start a new session. |
 | The agent performs a generic review | Name the **installed `al-code-review` skill** explicitly, as in the quick start. Ask which skill and BCQuality source it used. Another plugin or host may expose a similarly named operation. |
+| The agent answers a question without BCQuality citations | Name the **installed `al-knowledge` skill** explicitly, as in the [knowledge consultation example](knowledge-consultation.md#ask-a-question), and ask for the `knowledge-response` unchanged. An answer without cited articles is not BCQuality guidance. |
 | Installation works in the terminal, but not in the editor | Plugin discovery is host-specific. Follow the editor's installation instructions; a CLI installation is not proof that another host loaded the plugin. |
 | `pwsh` is missing, or index generation fails | The index is an accelerator, not required knowledge. The review can fall back to discovery from folders. For faster discovery, install [PowerShell 7](https://learn.microsoft.com/en-us/powershell/scripting/install/installing-powershell), or resolve the reported filesystem error. |
 | An update or local edit is not visible | Run `copilot plugin update bcquality` for a repository-installed plugin, then start a fresh session. For a directly installed local folder, reinstall that folder to refresh the cached copy; see [customizing](customizing-bcquality.md#use-your-fork). |
@@ -26,7 +27,7 @@ start with `/`.
 | `partial`, a timeout, or an unfinished review | Read `outcome-reason` and domain reports. Retry the incomplete scope in a fresh session, use smaller app folders or a focused review, or select a host/model with sufficient capacity. Keep the limited scope visible; do not relabel it a complete app review. |
 | `failed` | Resolve the stated problem, such as inaccessible input, a failed invocation, or an unverifiable reference, before using that report. A failed domain's findings are not reliable. |
 | `no-match` or `not-applicable` | Confirm you supplied AL source, the intended folder/file/diff, and an appropriate goal. Check [disabled skills and layers](customizing-bcquality.md#select-layers-or-disable-a-review). |
-| `no-knowledge` | Check the target BC version, selected domain, enabled layers, and whether the relevant knowledge files are present. No applicable rules is different from no defects. |
+| `no-knowledge` | Check the target BC version, selected domain, enabled layers, and whether the relevant knowledge files are present. No applicable rules is different from no defects. From `al-knowledge`, it means no installed article answers the question: a coverage gap, not a negative answer. |
 | `completed` with no findings | This can be a valid clean result for the selected scope. Confirm the intended files and domain reports are included. If you have a concrete missed defect, report it with a minimal example. |
 | JSON rather than a readable summary | JSON is the shared output format. Ask the host to summarize the existing reports, preserving outcomes, locations, severity, confidence, and references. |
 | A surprising finding | Open its guidance and samples, inspect surrounding code, and confirm version/localization assumptions. Ask the agent to explain the evidence; do not apply a suggestion solely because it has high confidence. |
diff --git a/docs/using-bcquality.md b/docs/using-bcquality.md
index b6606767..ebf93760 100644
--- a/docs/using-bcquality.md
+++ b/docs/using-bcquality.md
@@ -12,7 +12,7 @@ and rendering; BCQuality does not install a BC extension or an agent.
 | Path | What to do |
 | --- | --- |
 | Read the knowledge yourself | Browse [knowledge by domain](#knowledge-by-domain), or search the repository for an AL concept. Read the article and its samples. No installation required. |
-| Use a supplied skill | Follow the [plugin quick start](../README.md#quick-start). `al-code-review` reviews code and returns findings; the preview `al-plan-guidance` enriches an existing development plan before coding. |
+| Use a supplied skill | Follow the [plugin quick start](../README.md#quick-start). `al-code-review` reviews code and returns findings; `al-knowledge` answers a development question with cited knowledge; the preview `al-plan-guidance` enriches an existing development plan before coding. |
 | Use your own agent or workflow | Supply selected articles as context, as described below, or use the [integration bootstrap](agent-consumption.md#try-a-minimal-integration) to execute BCQuality action skills without the plugin. |
 | Get guidance before coding (preview) | Ask the plugin's `al-plan-guidance` skill to enrich an existing plan, then review the finished change. See [plan guidance](../README.md#preview-guidance-before-implementation). |
 
@@ -66,8 +66,8 @@ integration protocol. The remaining sections describe the review workflow.
 The [quick start](../README.md#quick-start) documents GitHub Copilot CLI. Use a
 current CLI release with plugin support and sign in to an account allowed to
 use it. In an interactive CLI session, `/skills list` should include
-`al-code-review` and `al-plan-guidance`; in the terminal, `copilot plugin list`
-should include `bcquality`.
+`al-code-review`, `al-knowledge`, and `al-plan-guidance`; in the terminal,
+`copilot plugin list` should include `bcquality`.
 
 Do not assume a CLI installation also installs the plugin into VS Code,
 another editor, or another agent host. Follow that host's plugin instructions
diff --git a/microsoft/skills/knowledge/al-knowledge.md b/microsoft/skills/knowledge/al-knowledge.md
index 4f32c727..42d45c86 100644
--- a/microsoft/skills/knowledge/al-knowledge.md
+++ b/microsoft/skills/knowledge/al-knowledge.md
@@ -7,7 +7,7 @@ description: Answer a Business Central development question with cited knowledge
 inputs: [knowledge-query]
 outputs: [knowledge-response]
 bc-version: [all]
-technologies: [al]
+technologies: [al, javascript]
 countries: [w1]
 application-area: [all]
 ---
diff --git a/skills/do.md b/skills/do.md
index 4a3721b7..d47a2eff 100644
--- a/skills/do.md
+++ b/skills/do.md
@@ -502,6 +502,7 @@ an expected pin. A conditional reference lists each unknown applicability
 dimension in `unknown[]`; fully applicable references use `applicable` with an
 empty `unknown[]`. READ defines matching and conflict precedence. Record
 displaced articles in `suppressed[]` without citing them as supporting guidance.
+Each article path appears at most once across `references[]` and `suppressed[]`.
 
 `completed` requires a useful answer to the bound question and at least one
 verified supporting reference. Applicability under READ does not establish
diff --git a/tools/validate_knowledge_response.py b/tools/validate_knowledge_response.py
index cab9776c..4e47e896 100644
--- a/tools/validate_knowledge_response.py
+++ b/tools/validate_knowledge_response.py
@@ -10,6 +10,7 @@
 import argparse
 import hashlib
 import json
+from collections import Counter
 from pathlib import Path
 
 from jsonschema import Draft7Validator
@@ -24,6 +25,11 @@ def validate_response(response, *, question, root, evidence=None, run_id, enable
         return errors
     if response["question"] != question:
         errors.append("question must equal the bound input exactly, including whitespace")
+    cited = Counter(reference["path"] for reference in response["references"])
+    excluded = Counter(entry["path"] for entry in response["suppressed"])
+    errors += [f"Duplicate citation path: {name}" for name in sorted(cited) if cited[name] > 1]
+    errors += [f"Duplicate suppression path: {name}" for name in sorted(excluded) if excluded[name] > 1]
+    errors += [f"Path is both cited and suppressed: {name}" for name in sorted(cited.keys() & excluded.keys())]
     known_layers = {"microsoft", "community", "custom"}
     enabled_layers = set(enabled_layers)
     if not enabled_layers <= known_layers: