Instruction initialization blocked by unavailable sources: core/instructions #52290

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1. github-actions

   assigned

   jlongster

   on Sep 30, 2026
2. github-actions commented on Sep 30, 2026

   

   github-actionsBot

   on Sep 30, 2026 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • #50296: Reports the same Instruction initialization blocked by unavailable sources: core/instructions error on Windows.
   • #51441: Reports the same initialization error when opening an older project in OpenCode 2.x.
   • #50857: Reports the same failure on Windows when a workspace path uses a lowercase drive letter.
   • #47839: Reports the same instruction initialization failure for case-variant Windows project paths.
3. opencodejr commented on Oct 28, 2026

   

   opencodejrBot

   on Oct 28, 2026

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   Thanks for the report! I think this is a duplicate of #52874. On Windows, if a git project is opened with a drive letter cased differently from the one git reports (e.g. c:\project vs C:\project), the search for AGENTS.md overflowed the stack. Instructions then became unavailable and every prompt failed with this exact error. That fits what you saw: only git projects are affected, so your old project fails and an empty folder works.

   This was fixed in #53349, which first shipped in v2.0.24. You're on 2.0.20, so please upgrade (npm install -g @opencode/cli@latest) and try again.

   Possible duplicates and related issues, ordered by likelihood:

   • core: instruction discovery stack-overflows with case-variant Windows paths ("Instruction initialization blocked: core/instructions") #52874: stack overflow in instruction discovery with case-variant Windows paths, same error (fixed by fix(core): stop instruction walk at case-variant Windows project roots #53349)
   • OpenCode 2.x InitializationBlocked: triggered by legacy 1.x session data #51441: the same report as yours (Windows, old project, this error on the first prompt), resolved by the same fix
   • core: instruction initialization blocked by unavailable sources (Maximum call stack size exceeded) #50296 / instructions: Windows lowercase drive letter in workspace path causes stack overflow, blocking all sessions #50857 / instructions: RangeError stack overflow activating AGENTS.md for case-variant Windows location #50750: earlier reports of the same Windows drive-letter case problem
   • server: case-sensitive duplicate locations on Windows break instruction init (core/instructions) #47839: same folder opened with different path casing on Windows breaks core/instructions
   • Folder named agents.md in a parent directory blocks all instructions (EISDIR): "Instruction initialization blocked by unavailable sources: core/instructions" #52301: a folder named agents.md in a parent directory causes the same error (fixed in v2.0.22)

   By the way, the B:/~BUN/... paths in the stack trace are Bun's internal paths for the bundled binary, not a real drive, so you can ignore them.

   The bot will close this issue as a duplicate in 1 day unless you reply explaining how your problem is different, for example if it still happens on the latest version.
4. opencodejr

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   triaging

   on Oct 28, 2026
5. opencodejr

   closed this as duplicateon Oct 29, 2026
6. opencodejr commented on Oct 29, 2026

   

   opencodejrBot

   on Oct 29, 2026

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   Closing this as a duplicate of #52874, since there hasn't been a reply in the last day. The core/instructions initialization error on Windows git projects comes from a drive-letter case mismatch. It was fixed in #53349, which first shipped in v2.0.24. Please upgrade with npm install -g @opencode/cli@latest.

   If it still happens on the latest version, please comment here with your version and the log output and we can reopen it. Thanks for the report!