diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 66052fe4..0de71bf2 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Fixed
 
+- Fixed project context discovery to load `AGENTS.MD` files in addition to `AGENTS.md` ([#3949](https://github.com/badlogic/pi-mono/issues/3949)).
 - Fixed `/handoff` to use compacted session context instead of pre-compaction raw messages ([#3945](https://github.com/badlogic/pi-mono/issues/3945)).
 - Fixed idle follow-up submission to clear the editor like normal message submission ([#3926](https://github.com/badlogic/pi-mono/issues/3926)).
 - Updated the sandbox extension example lockfile to resolve the vulnerable `lodash-es` transitive dependency ([#3901](https://github.com/badlogic/pi-mono/issues/3901)).
diff --git a/packages/coding-agent/src/core/resource-loader.ts b/packages/coding-agent/src/core/resource-loader.ts
index 832bb017..338daf7e 100644
--- a/packages/coding-agent/src/core/resource-loader.ts
+++ b/packages/coding-agent/src/core/resource-loader.ts
@@ -56,7 +56,7 @@ function resolvePromptInput(input: string | undefined, description: string): str
 }
 
 function loadContextFileFromDir(dir: string): { path: string; content: string } | null {
-	const candidates = ["AGENTS.md", "CLAUDE.md"];
+	const candidates = ["AGENTS.md", "AGENTS.MD", "CLAUDE.md", "CLAUDE.MD"];
 	for (const filename of candidates) {
 		const filePath = join(dir, filename);
 		if (existsSync(filePath)) {