Betterglob

Three OpenCode plugins that replace the built-in glob, grep and read tools. They register under the same tool IDs and accept the arguments models already use, so prompts and agents keep working unchanged. Behind the call, output stays inside the host budget and says where to continue, search processes cannot hang, and results come back in the same order on every run.

Each plugin is published on its own. Install only the ones you want.

🎯 What you notice in use

• read cuts its output at the host's tool_output budget and ends with the offset to continue from, so the model resumes where it stopped and does not re-read what it already has. A single line larger than the budget is reported by number instead of being dropped.
• Every search process has a deadline and is killed on timeout or cancellation. glob launches rg directly in its own process group on POSIX and signals the group: SIGTERM at the limit, SIGKILL after 250 ms if it has not closed.
• Ordering does not depend on timing or locale. grep breaks mtime ties by raw path bytes, and read sorts directory entries by UTF-16 code units. The same tree gives the same listing on every runtime.
• The GNU grep fallback runs with LC_ALL=C.UTF-8 and an empty LANGUAGE, so its output parses the same on a machine with a translated locale. If ripgrep fails once, the plugin tries it again after 10 minutes instead of staying on GNU grep for the rest of the session.
• Startup is lighter. effect (in read) and which and proper-lockfile (in glob) load on first use. Cold start of read dropped from about 260 ms to about 70 ms.

⏱️ Benchmark against the built-in tools

These are timings of the built-in read, grep and glob from the OpenCode 1.18.32 source and of the three plugins at 1.1.0, measured on one machine over the same files. Times are in milliseconds and lower is better. Per-release notes are on the Releases page.

How it was measured:

• Each tool is called in process with the same arguments, with no model or UI in between, so the numbers cover the tool itself.
• The files are the OpenCode repository (about 6,600 files) and two generated fixtures: a 13 MB log of 200,000 lines and a directory of 5,000 files.
• The machine is a 4-core Arm Neoverse-N1 VM on Ubuntu 24.04 with ripgrep 15.2.0 on PATH and a warm file cache.
• Every case makes 5 to 9 timed calls after a discarded first call, and each run of the suite records their median. The tables show the median across runs: 5 runs for the built-in tools and 4 for the plugins (Bun 1.4.2 and Bun 1.3.14, two runs each). The two Bun versions differ by about 3 ms at most on any row.
• The built-in grep and glob return at most 100 results, and the built-in glob does not sort. The grep and glob tables therefore call the plugins with max_results: 100, and glob also with limit: 100 and sort_by: "none". The read table leaves the plugin on its default budget of 2,000 lines or 50 KiB, the same as the built-in. Output sizes are similar but not identical, and differ by up to 2× on the single 300 KB line.

read

The plugin is faster on every case. The gap is smallest on the 5,000-entry directory (1.1×) and largest when reading 200 lines deep into the 13 MB log.

grep

Both sides run ripgrep. A search that walks the whole repository takes 34 to 42 ms either way, and the plugin is about 1.2× faster there. On searches limited to *.ts it is 1.9× to 2.1× faster, and on the 13 MB log 2.8× to 3.2×.

glob

With the same limit and no sorting, the plugin takes the same time as the built-in tool or slightly less. The plugin defaults to 500 paths sorted by modification time, and that sort is what costs time. In a separate run on the repository, the sort added about 25 ms to **/*.ts and 40 ms to **/*, while raising the limit from 100 to 500 added about 1 ms. Pass sort_by: "none" when order does not matter.

These figures come from one machine and one repository. They leave out the host and the model, which add their own latency in a real session.

🚀 Install

npm install opencode-betterglob opencode-bettergrep opencode-betterread

Then list the plugins in your OpenCode config by package name:

{
  "plugin": [
    "opencode-betterglob",
    "opencode-bettergrep",
    "opencode-betterread"
  ]
}

git clone https://github.com/dhaern/better-opencode-tools.git
cd better-opencode-tools
bun install
bun run build

{
  "plugin": [
    "file:///path/to/better-opencode-tools/packages/opencode-betterglob",
    "file:///path/to/better-opencode-tools/packages/opencode-bettergrep",
    "file:///path/to/better-opencode-tools/packages/opencode-betterread"
  ]
}

⚙️ Output budget

read takes its limits from the tool_output block of your OpenCode config. Raise them if you want larger windows per call:

{
  "tool_output": {
    "max_lines": 4000,
    "max_bytes": 153600
  }
}

Missing or invalid values fall back to 2,000 lines and 51,200 bytes. grep and glob do not read this block. They are limited per call with max_results and limit.

✅ Compatibility

The plugins target the OpenCode 1.x plugin API and are built against @opencode-ai/plugin 1.18.32. Their entry points use the v1 module shape ({ id, server }). Loading them in an OpenCode v2 host has not been tested, because no v2 host was available.

⚠️ Known limitations

• Reading a file inside a subproject does not attach that subproject's nested AGENTS.md. The native tool does, but the plugin API does not expose the host's instruction resolver.
• If several plugins register the same tool ID, OpenCode's plugin load order decides which one wins.
• The first search may download a managed ripgrep binary when none is on PATH, so it needs network access once.
• The plugins replace the agent-facing tool calls only. They do not patch OpenCode internals.

🧪 Development

bun install
bun run check
bun run typecheck
bun test
bun run build

The root scripts run across every package under packages/*. Please run all of them before opening a PR, and keep changes inside the plugins unless a core change has been discussed first.

Bugs, feature requests and questions go through the issue forms. A small workflow adds the plugin label and asks for whatever is missing from an incomplete report.

Thanks to oh-my-opencode-slim for pushing the OpenCode plugin ecosystem forward and inspiring part of the standalone direction taken here. It is worth trying if you want a broader plugin setup.