io.github.basitalisandhu/mcp-jwt-tools

JWT Tools

Is the JWT Tools MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-29.

Decode JWTs without verifying, flag risky algorithms and claims, verify HS256 or RS256 with a key.

alive probed 2026-11-15 · unchanged since 2026-10-29

3tools

1.7ktokens in Claude Opus 5.5

0.8 %of Claude's 200k window

0.7×the median server

1.7 sto initialize

11 msto list tools

Run it: docker run -i --rm ghcr.io/basitalisandhu/mcp-jwt-tools:0.3.0 (stdio, probed in a container with the network off)
Host: ghcr.io
Reports itself as: jwt-tools 0.3.0
Capabilities: tools
Instructions: 521 characters
Of a 1M window: 0.2 % of a 1M context window
Count: 1.7k tokens in Claude Opus 5.5, exact, measured 2026-10-29. With the Claude Code prefix mcp__…__ on each tool name: 1.7k. The o200k_base estimate is 969. Counted again when the tool definitions change. Method.
Repository: https://github.com/basitalisandhu/dev-mcp-servers
Website: https://basitalisandhu.github.io/dev-mcp-servers/
Registry: active, updated 2026-10-28 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.75×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
verify_jwt	711	407	42 %
sign_test_jwt	506	290	30 %
decode_jwt	475	272	28 %

Other registry entries on ghcr.io, the ones next to this name; all of them.

Servers that mention algorithms or verifying.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.