Scriptbox

A closed-world registry of reusable agent utility scripts for OpenCode. Scripts run via shell — this plugin exposes them, never executes.

Built on the OpenCode 2.x plugin API only. No 1.x support.

Every session rediscovers the same helpers — the PNG diff, the log census, the report shaper — and each time they come back slightly different, living in /tmp or inlined into a heredoc that vanishes with the turn. Past sessions evaporate, so agents reinvent instead of reuse. Scriptbox gives those helpers one canonical home: a user-level directory where each script carries a header contract, gets indexed on every read, and shows up on demand as a single purpose line. Nothing enters context by merely being on disk — only scripts with a valid name and header are visible, and everything else in the directory stays private by default.

Filenames are lowercase alphanumeric-and-hyphens with a .py or .sh suffix, descriptive enough to read (png-compare.py, never tmp-1.py). The leading header carries a purpose: one-liner of at most 140 characters plus an optional usage: line:

"""purpose: Compare baseline vs verify screenshots, print bbox diff.
usage: python3 png-compare.py BASE VERIFY [--json]
reads: two PNG files. writes: stdout only.
"""

Shell scripts say the same with # purpose: and # usage: comment lines. Anything without a valid name or header is ignored by the indexer, silently and completely.

Three tools in the scriptbox namespace work the registry. save takes a filename and content, validates both against the contract, and stores the script in one step — rejection happens before anything touches disk. list returns the compact catalog of name plus purpose from a live disk scan, which is the check to run before reaching for an ad-hoc heredoc. show gives back usage, path, and last-used for one script. Alongside them, a tool.execute.before hook watches shell invocations that reference registry scripts and bumps their lastUsed, quietly feeding future pruning. It never blocks or alters a call.

{ "package": "opencode-scriptbox@0.1.0", "options": {} }

Two options exist: { "dir": "/custom/registry/dir" } (the default home is ~/.config/opencode/scripts) and { "metrics": true }, which keeps session-aggregated counters — save, list and show calls, per-script uses and shell matches — in the registry's usage.json, capped at twenty sessions with cumulative totals. Only counts, never commands or contents, and it defaults to off.

Development

npm install --no-audit --no-fund
npm test
npm run typecheck

License

MIT.