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preflight

preflight is a MCP server by preflight-dev that catch vague Claude Code prompts before they waste tokens: prompt scorecards, session history search, cross-service contract awareness and cost estimation.

Updated 2026-03-20

What is preflight?

preflight is a MCP server by preflight-dev that catch vague Claude Code prompts before they waste tokens: prompt scorecards, session history search, cross-service contract awareness and cost estimation. It is listed under Developer tools and has 13 GitHub stars.

TypeMcp server
Authorpreflight-dev
Repositorypreflight-dev/preflight
Popularity13 GitHub stars
CategoryDeveloper tools
SecurityLow risk (80/100)
Rank#1,545 of 4,418 MCP servers; #351 in Developer tools
LicenseMIT
Last commit2026-03-20
RunsLocally
LanguageTypeScript
PlatformsmacOS, Windows, Linux

Is preflight safe to install?

preflight scores 80/100 on the MCPMods security check: Low risk. Things to review: executes code or shell commands. It passed 3 of 6 checks.

MCP server results come from listing signals: who publishes it, where your data goes and what it can do. The code itself is not scanned yet.

CheckResult
Community-built serverNote
Runs on your machine onlyPass
Needs an API key or account loginNote
Read-only by descriptionPass
Executes code or shell commandsReview
Source on GitHubPass

How do I install preflight?

  1. Find the launch command. The README says how the server starts (npx, uvx, docker or a remote URL) and which API keys it needs.
    https://github.com/preflight-dev/preflight
  2. Add it to Claude Code. Replace the part after -- with the command from the README. Remote servers use --transport http with a URL.
    claude mcp add preflight -- <command from README>
claude mcp add --transport http preflight <server-url>
  3. Check it connected. This lists your MCP servers and their status.
    claude mcp list

Or ask Claude to set it up

Paste this into Claude Code and it installs preflight for you:

Add the "preflight" MCP server from https://github.com/preflight-dev/preflight to Claude Code. Read its README for the launch command and any API keys I need, run claude mcp add, then check that it connects.