OpenTUI is a library for building terminal user interfaces with TypeScript, React, or Solid, using a Zig-based native core. Developers use it to create keyboard- and mouse-driven terminal applications with elements such as text, inputs, selections, images, and scrollable areas. Catalogue add-ons provide documentation and guidance for working with OpenTUI.
Borrowing it
Nothing to install: this file belongs to anomalyco/opentui. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/anomalyco/opentui/main/AGENTS.mdgit clone --depth 1 https://github.com/anomalyco/opentuiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/anomalyco/opentui/agents-md)<a href="https://agentmods.dev/instructions/anomalyco/opentui/agents-md"><img src="https://agentmods.dev/badge/instructions/anomalyco/opentui/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/anomalyco/opentui/agents-md"><img src="https://agentmods.dev/badge/instructions/anomalyco/opentui/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.01100 | $0.01100 |
| Opus 5.5 | $0.00440 | $0.00440 |
| Sonnet 5.5 | $0.00220 | $0.00220 |
| Haiku 4.5 | $0.00110 | $0.00110 |
Grade A, and why
opentui AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OpenTUI Agent Guide
Engineering
- Reuse existing seams; do not duplicate policy, ownership, or state across TypeScript, Zig, and framework layers.
- For bug fixes, first add a focused regression test of observable behavior or invariants. If automation is impossible, record the evidence and remaining manual verification; do not substitute contract sketches or guesses.
- Make native ownership explicit; clean up handles, callbacks, buffers, and listeners on every exit path. Bound input-driven work and test lifecycle failures.
- Do not interchange byte lengths, code points, graphemes, and terminal display-cell widths.
oxfmtis the formatting source of truth (semi: false,printWidth: 120); avoid unrelated formatting churn.- In delegated tasks, name the local rendering behavior, owned files, and required checks. Describe ordinary renderer work as correctness and compatibility testing; reserve security terminology for actual security work. Use concrete scopes such as frame parity, callback ordering, resource cleanup, or loopback SSH output tests. Request an independent correctness review and a separate reproduction check of actionable findings.
Tooling And Runtimes
- Use Bun for dependency management and development commands:
bun install,bun run <script>,bun test, andbun <file>. - Run package scripts from the package directory unless the script is defined at the repository root.
- Shared runtime code must preserve the supported Bun and Node paths. Keep runtime-specific behavior behind existing
platform/runtime/build seams; do not introduce Bun-only APIs into shared modules. Node checks use the minimum
version enforced by
scripts/node26.mjs.
Verification
- Run the narrowest relevant test first, then the affected package suite.
- Ordinary TypeScript source changes do not require the root build. Use the affected package's
test,typecheck,build, or validation scripts as applicable. - Run
bun run buildfrom the repository root after native or cross-package build/output changes, or when tests report a missing/stale native artifact. It does not build web or examples; use their package scripts. - For native changes, run
bun run test:nativefrompackages/core. Filter withbun run test:native -Dtest-filter="test name"while iterating. - For runtime, FFI, build, or export changes, run the relevant Node and packed-distribution scripts from that package
(such as
test:js:nodeortest:dist) when present. - Use root
bun run fmt:checkandbun run lintfor final static checks when relevant.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed · +4 lines · +75 tokens per session dd067433d8de
- 2mo ago Changed · +3 lines · +67 tokens per session e52c6236a1cf
- 2mo ago First seen · 56 lines · 958 tokens per session scan A 506ce119580e
opentui AGENTS.md is an instructions file published in the GitHub repository anomalyco/opentui (13,714 stars, last pushed yesterday), licensed MIT. It adds 1,100 tokens to every session, about $0.0044 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
opentui AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| opentui AGENTS.mdanomalyco/opentui | Instructions file | 14k | yesterday | MIT | A | 1,100 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |