dev.flagbearer/flagbearer
Flagbearer
Is the Flagbearer MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-13.
Feature flags for coding agents: create flags, roll them out gradually and write the flag code.
alive probed 2026-11-14 · unchanged since 2026-11-13 · HTTP 200
- Endpoint
- https://mcp.flagbearer.dev (streamable-http)
- Host
- mcp.flagbearer.dev
- Protocol
- 2025-06-18
- Reports itself as
- flagbearer 1.0.0
- Capabilities
- tools
- Instructions
- 1 526 characters
- Of a 1M window
- 0.2 % of a 1M context window
- Count
- 2.5k tokens in Claude Opus 5.5, exact, measured 2026-11-13. With the Claude Code prefix mcp__…__ on each tool name: 2.6k. The o200k_base estimate is 1.5k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/flagbearer-dev/sdks
- Website
- https://docs.flagbearer.dev/sdks/mcp
- Registry
- active, updated 2026-11-12 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.70×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| set_flag | 447 | 263 | 18 % |
| get_user_flags | 442 | 260 | 18 % |
| get_sdk_docs | 352 | 207 | 14 % |
| generate_flag_types | 347 | 204 | 14 % |
| create_flag | 299 | 176 | 12 % |
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Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.
Fixed something? Probe it now, with the same steps as the daily run. This page updates with the next daily run.