500+ typed UI atoms an agent composes into real rendered interfaces. Free, no API key.
- Passed: Handshake
- Passed: Tools listed
- Passed: Latency
Median latency 91 ms · Last checked
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Evidence for your next connection.
Independent measurements of remote MCP servers. Every observation has a timestamp.
Read-only probesMCP server · Code & DevOps
Feature flags for coding agents: create flags, roll them out gradually and write the flag code.
3 failed · 8 not measured
Median of successful probes over 7 days
Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.
Tool definitions returned by this server
Independent monitoring
Responded
The server completed its last measured handshake. This is an observation, not a guarantee.
Last checked . Not enough checks yet| Test area | Passed | Failed | Unmeasured |
|---|---|---|---|
ConnectionCan a client connect and discover tools? | 5 | 0 | 0 |
Reliability & speedDoes it respond consistently and quickly? | 0 | 0 | 4 |
Access & authenticationWhat is required to use this server? | 1 | 0 | 2 |
Tool qualityAre the tool definitions usable by an agent? | 2 | 2 | 0 |
Publisher identityCan the publisher be traced to its source? | 3 | 1 | 2 |
Unmeasured means there is not enough evidence to decide. How these checks work
Start using Flagbearer
Choose your client, copy the configuration, then enable the server in your client’s MCP settings.
Run this command in your terminal, then restart Claude Code.
Claude Code
claude mcp add --transport http flagbearer https://mcp.flagbearer.devCapabilities
What looks wrong with how an application's SDKs are set up, per environment, from what they sent in the last day: flags the code checks that don't exist, wrong or leaked keys, old SDK versions, and environments nothing has connected to. Call this when flags aren't behaving as expected, and after adding flag code and running the app.
DiscoveredCreate a feature flag in an application. It starts off in every environment; use set_flag to turn it on. The key is what code checks, like new-checkout.
DiscoveredThe text of a TypeScript file listing an application's flag keys, so a misspelled key is a type error and editors autocomplete keys. Write the returned text to the path exactly as it is, and commit it. Only for TypeScript projects using @flagbearer/web (React and browser apps), @flagbearer/node or @flagbearer/react-native. Call it when setting up flags in such a project, and again after creating a flag.
DiscoveredThe current Flagbearer SDK docs for a platform (react, react-native, ios, android, browser, node, python, go, java, dotnet, ruby, rust, cpp or php), plus one environment's SDK address and public client key. Call this before writing code that checks a flag, and follow it.
DiscoveredWhat a user should have got for every flag in one environment, by email or user key, with the reason (off, tester or rollout and their bucket), what their SDK reported that UTC day (seen), and any changes that day that flipped their result. Use it when a bug report says a feature stopped working, or works for some users and not others. times is a list of ISO timestamps to show side by side, like before and after a report; leave it out for now. An email the SDK saw with several user keys gives one entry per key.
DiscoveredList the applications in an organization. Flags belong to an application.
DiscoveredList an application's feature flags with whether each is on, and its rollout percent, in every environment.
DiscoveredList the Flagbearer organizations you belong to. Start here to find an organization's ID. This connection only covers the organizations listed. If the project's application isn't in any of them, tell the user before writing flag code, and ask them to reconnect and approve the right organization.
DiscoveredTurn a flag on or off in one environment, by flag key and environment key. When turning a flag on, rolloutPercent says who gets it: 100 for everyone, or a percentage of users. Ask the user whether it should be on for everyone. Without rolloutPercent it's 0, which turns it on only for the environment's testers. Changing production needs confirmProduction: true. Only send that after the user has confirmed the change.
DiscoveredRecent measurements
| Checked | Result | Response | Tools |
|---|---|---|---|
| Connected | 513 ms | 9 |