Summary

/sync-gbrain --code-only (and ~/.claude/skills/gstack/bin/gstack-gbrain-sync.ts) generates a source-id that gbrain v0.20+ rejects:

ERR  code  source registration failed: gbrain sources add gstack-code-github.com-<org>-<repo> failed:
Invalid source id "gstack-code-github.com-<org>-<repo>".
Must be 1-32 lowercase alnum chars with optional interior hyphens (e.g. "wiki", "yc-media").

Reproduction

• gstack: v1.26.3.0
• gbrain: v0.26.7 (from master tip, schema v34)
• Steps:
  1. cd into a git repo whose origin URL is a typical GitHub HTTPS or SSH URL (github.com/<org>/<repo>.git — contains dots)
  2. Run ~/.claude/skills/gstack/bin/gstack-gbrain-sync.ts --code-only --incremental
  3. Sync errors out at the sources add step

The generated id gstack-code-github.com-<org>-<repo> contains:

• dots (from github.com)
• often > 32 chars for normal repo names

Both violate gbrain's source-id rule (^[a-z0-9](?:[a-z0-9-]{0,30}[a-z0-9])?$).

Expected

Generator produces a valid source-id that fits gbrain's contract.

Suggested fix

Either:

• Drop the gstack-code- prefix (saves 12 chars) and slugify only the repo basename, e.g. <repo> or <org>-<repo> truncated.
• Or hash the canonical remote URL (e.g. first 12 chars of sha1) and prepend a short literal: gs-<hash>.
• Or accept input via --source-id <id> so users can override.

The current implementation appears to use the canonicalized remote URL verbatim with - instead of /.:. Replacing . with - makes it valid char-wise but doesn't address the length cap.

Workaround

For now, calling gbrain import .codesight/wiki directly (the legacy markdown-import path) bypasses the source-id validation entirely. /sync-gbrain is unusable until this is fixed.

Environment

• macOS 26.3 (Darwin 25.4.0)
• bun 1.3.11
• Postgres 18.3 (Homebrew)