On OpenCode v2.0.21, fs.up treated any existing AGENTS.md as a hit, including a directory. On macOS the lookup for AGENTS.md matches a folder named agents.md. readFileStringSafe still only catches NotFound and PermissionDenied, so EISDIR turns the whole project source into Instructions.unavailable and every prompt fails with Instruction initialization blocked by unavailable sources: core/instructions. I didn’t start OpenCode; I ran the walk and the catch list on a Linux tree with a directory named AGENTS.md above two real files.

v2.0.22 passes type: "file". After a read, a directory sitting between two files on the nested walk used to throw inside sessionInstructions.load; the catch dropped every later AGENTS.md. #52576. The discovery test only asserts the options object grew type: "file". #52301 is still open.