io.github.rcsb/rcsb-mcp
RCSB PDB
Is the RCSB PDB MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.
MCP server to search, inspect, and cross-reference RCSB Protein Data Bank structures
alive probed 2026-11-14 · unchanged since 2026-10-31
- Run it
- uvx rcsb-mcp@0.23.0 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- rcsb_mcp 0.23.0
- Capabilities
- experimental, prompts, resources, tools
- Instructions
- 910 characters
- Of a 1M window
- 2.7 % of a 1M context window
- Count
- 27k tokens in Claude Opus 5.5, exact, measured 2026-10-31. With the Claude Code prefix mcp__…__ on each tool name: 28k. The o200k_base estimate is 16k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/rcsb/rcsb-mcp
- Website
- https://github.com/rcsb/rcsb-mcp
- Registry
- active, updated 2026-10-23 · registry entry
- Changes
- 3 recorded, reachable in 3 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.69×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| rcsb_search_request | 2 826 | 1 676 | 10 % |
| rcsb_render_report | 2 308 | 1 369 | 8 % |
| rcsb_query_attribute | 2 094 | 1 242 | 8 % |
| rcsb_describe_data_object | 1 792 | 1 063 | 7 % |
| rcsb_query_strucmotif | 1 121 | 665 | 4 % |
Compare this server with others.
More servers
Other registry entries on pypi.org, the ones next to this name; all of them.
- state-trace io.github.razroo/state-trace · needs network
- Scherlok io.github.rbmuller/scherlok · crashed on start
- io.github.rcgiri-physics/physverify · alive
- kasm-use io.github.rchurro/kasm-use · alive
- SQL Benchmarks Lab io.github.rctruta/sqlbenchdag · needs args
- ReadyAgents io.github.readyagentsdev/readyagents · crashed on start
- FirstAGI Arena io.github.realbtr/firstagi-arena · alive
- io.github.recordant/recordant · needs args
Servers that mention rcsb.
- Rcsb Pdb io.github.pipeworx-io/rcsb-pdb · alive
- io.github.mrfentmen/rcsb-pdb-mcp · alive
- io.github.mrfentmen/pdb-mcp · alive
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-31 07:38 | alive | 1.7 s | 36 | 27k | 16k |
| 2026-10-24 06:34 | alive | 2.3 s | 36 | 16k | |
| 2026-10-17 06:18 | alive | 3.2 s | 36 | 28k | 17k |
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
- This server is in the heaviest 10 % of the registry. Its 5 most expensive tools are 37 % of the cost. Shorter descriptions, fewer optional parameters and fewer tools cut the cost. The command npx mcpcost --url <endpoint> --tools 50 lists every tool with its cost.