Clarify Copilot custom instructions support across multiple platforms & Copilot features (#57587)

Author: hubwriter

content/copilot/how-tos/configure-custom-instructions/add-repository-instructions.md

@@ -20,7 +20,6 @@ redirect_from:
 This version of this article is for using repository custom instructions on the {% data variables.product.github %} website. Click the tabs above for information on using custom instructions in other environments. <!-- markdownlint-disable-line MD027 -->
 
 {% data reusables.copilot.repository-custom-instructions-support %}
-* **{% data variables.copilot.copilot_code-review_short %}**
 
 {% data reusables.copilot.repository-custom-instructions-prerequisites %}
 
@@ -31,7 +30,6 @@ This version of this article is for using repository custom instructions on the
 This version of this article is for using repository custom instructions and prompt files in {% data variables.product.prodname_vscode_shortname %}. Click the tabs above for instructions on using custom instructions in other environments.
 
 {% data reusables.copilot.repository-custom-instructions-support %}
-* **{% data variables.copilot.copilot_code-review_short %}**
 
 {% data reusables.copilot.repository-custom-instructions-prerequisites %}
 
@@ -42,7 +40,6 @@ This version of this article is for using repository custom instructions and pro
 This version of this article is for using repository custom instructions in {% data variables.product.prodname_vs %}. Click the tabs above for instructions on using custom instructions in other environments.
 
 {% data reusables.copilot.repository-custom-instructions-support %}
-* **{% data variables.copilot.copilot_code-review_short %}**
 
 {% data reusables.copilot.repository-custom-instructions-prerequisites %}
 
@@ -53,7 +50,6 @@ This version of this article is for using repository custom instructions in {% d
 This version of this article is for using repository custom instructions in JetBrains IDEs. Click the tabs above for instructions on using custom instructions in other environments.
 
 {% data reusables.copilot.repository-custom-instructions-support %}
-* **{% data variables.copilot.copilot_code-review_short %}**
 
 {% data reusables.copilot.repository-custom-instructions-prerequisites %}
 
@@ -76,7 +72,6 @@ This version of this article is for using repository custom instructions in Xcod
 This version of this article is for using repository custom instructions in Eclipse. Click the tabs above for instructions on using custom instructions in other environments.
 
 {% data reusables.copilot.repository-custom-instructions-support %}
-* **{% data variables.copilot.copilot_code-review_short %}**
 
 {% data reusables.copilot.repository-custom-instructions-prerequisites %}
 

data/reusables/copilot/repository-custom-instructions-support.md

@@ -2,6 +2,22 @@
 
 Repository custom instructions let you provide {% data variables.product.prodname_copilot_short %} with repository-specific guidance and preferences.
 
-Repository custom instructions are currently supported for:
-* **{% data variables.copilot.copilot_coding_agent %}**
-* **{% data variables.copilot.copilot_chat_short %}**
+### Support for repository custom instructions
+
+The following table shows which {% data variables.product.prodname_copilot_short %} features support the `.github/copilot-instructions.md` instructions file.
+
+{% rowheaders %}
+
+| | Eclipse | JetBrains IDEs | {% data variables.product.prodname_vs %} | {% data variables.product.prodname_vscode_shortname %} | {% data variables.product.prodname_dotcom_the_website %} | Xcode |
+| --- | --- | --- | --- | --- | --- | --- |
+| {% data variables.copilot.copilot_chat_short %} | {% octicon "check" aria-label="Included" %} <sup>1</sup> | {% octicon "check" aria-label="Included" %} <sup>1</sup> | {% octicon "check" aria-label="Included" %} <sup>1</sup> | {% octicon "check" aria-label="Included" %} <sup>1</sup> | {% octicon "check" aria-label="Included" %} <sup>1</sup> | {% octicon "check" aria-label="Included" %} <sup>1</sup> |
+| {% data variables.copilot.copilot_coding_agent %} | N/A | N/A | N/A | {% octicon "check" aria-label="Included" %} <sup>3</sup> | {% octicon "check" aria-label="Included" %} <sup>3</sup> | N/A |
+| {% data variables.copilot.copilot_code-review_short %} | N/A | {% octicon "x" aria-label="Not included" %} | {% octicon "check" aria-label="Included" %} <sup>1</sup> | {% octicon "check" aria-label="Included" %} <sup>2</sup> | {% octicon "check" aria-label="Included" %} <sup>2</sup> | {% octicon "x" aria-label="Not included" %} |
+
+{% endrowheaders %}
+
+**1:** Repository-wide instructions (using the `.github/copilot-instructions.md` file) are supported.<br>
+**2:** Repository-wide instructions and path-specific instructions (using `.github/instructions/NAME.instructions.md` files) are supported.<br>
+**3:** Repository-wide instructions, path-specific instructions, and agent instructions (using `AGENTS.md`, `CLAUDE.md` or `GEMINI.md` files) are supported.<br>
+**X:** Custom instructions are not supported.<br>
+**N/A:** Feature not available on this platform.