MCP server

HTTP 428 precondition-required

io.github.sadri-dridi/http-428

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Meaning of HTTP 428.

Working at last checkAbout 9,807 tokens per request once connected31 tools

Source

https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 31
Token cost: About 9,807 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to Cursor Add to VS Code VS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http http-428 https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.http-428]
url = "https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp"

Gemini CLI

{"mcpServers":{"http-428":{"httpUrl":"https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp"}}}

Cursor

{"mcpServers":{"http-428":{"url":"https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp"}}}

VS Code

{"servers":{"http-428":{"type":"http","url":"https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp"}}}

Antigravity

agy mcp add http-428 https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"http-428","server_url":"https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"http-428","server_url":"https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-428/mcp"}

Tools

http-428 ~301 tokens
Meaning of HTTP 428.

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