AGENTS.mdA
AGENTS.md from platonai/browser4 is an AGENTS.md file: the standing instructions coding agents read in that repo.
mdr add platonai/browser4/AGENTS.md@git:20261007.d600238Pins git:20261007.d600238 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 14 of 14 checks passed
- Kind
- AGENTS.md file
- Repository
- platonai/browser4
- Path
AGENTS.md- Versions recorded
- 5
- Latest version
- git:20261007.d600238, committed Oct 7, 2026
- First version recorded
- Sep 23, 2026
- Size
- 24,115 bytes
- Repository stars
- 1,164
- License
- Apache-2.0
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Repository Guidelines
Repo: https://github.com/platonai/Browser4
## Architecture
```
browser4-cli (Rust) ──MCP over HTTP──▶ browser4-rest (Kotlin/Spring) ──▶ PulsarWebDriver (Kotlin/CDP)
▲ │
│ ▼
└──── e2e tests ────▶ Fixture HTTP server (Rust test harness)
```
- **CLI:** `cli/browser4-cli/` — Rust binary, MCP tool calls over HTTP
- **Backend:** `browser4-rest/` — Spring Boot, `MCPToolController` dispatches tools
- **Browser driver:** `browser4-core/browser4-browser/` — `PulsarWebDriver` wraps CDP
- **Agent tools:** `browser4-agentic/` — `AgentToolManager` maps MCP tool names → driver methods
### Dispatch chain (CLI → browser)
1. CLI builds MCP tool call: `{tool: "browser_type", arguments: {ref: "#el", text: "hi"}}`
2. `MCPToolController.callTool()` → `dispatchToToolExecutor()`
3. `normalizeFrontendToolCall()` applies `FRONTEND_TOOL_NAME_ALIASES` (e.g., `browser_type` → `fill`)
4. `DefaultArgumentNormalizer` maps `ref` → `selector`, strips `sessionId`, converts snake_case
5. `resolveMcpToolCall()` → `ToolCall("tab", "fill", args)`
…Read the whole file at its exact version.
How to install
mdr add platonai/browser4/AGENTS.md@sha256:dcdfafb57fdfc93dThe line at the top of this page pins the label git:20261007.d600238, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_u6wpfnl5aqr66rei)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 23, 2026 and Oct 7, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261007.d600238 latest | 2026-10-07 | d600238 | 24,115 B | A | view · diff |
| git:20261002.ee4eeee | 2026-10-02 | ee4eeee | 24,002 B | A | view · diff |
| git:20260924.110dddc | 2026-09-24 | 110dddc | 23,289 B | A | view · diff |
| git:20260924.106c80b | 2026-09-24 | 106c80b | 16,320 B | A | view · diff |
| git:20260923.d8dbc36 | 2026-09-23 | d8dbc36 | 23,223 B | A | view |
Audit of the latest version
- pass: Size between 200 bytes and 200 KB (24115 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
platonai/browser4 · 1,164 stars · license Apache-2.0 · pushed 2026-10-18 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_u6wpfnl5aqr66rei GET https://markdownregistry.com/api/v1/resolve?ref=platonai/browser4/AGENTS.md GET https://markdownregistry.com/api/v1/blob/dcdfafb57fdfc93d30868196d0ec0f4e8abe27de88142bd952b95de41c5b9d19
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Guides: how to write a good AGENTS.md · AGENTS.md vs CLAUDE.md · which agent file does what.
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