io.github.ofershap/s3

mcp-server-s3

Is the io.github.ofershap/s3 MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

AWS S3 MCP — list buckets, browse objects, upload/download, presigned URLs.

alive probed 2026-11-14 · unchanged since 2026-10-30

7tools

1.1ktokens in Claude Opus 5.5

0.6 %of Claude's 200k window

0.5×the median server

555 msto initialize

15 msto list tools

Run it: npx -y mcp-server-s3@1.0.1 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: mcp-server-s3 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: 0.1 % of a 1M context window
Count: 1.1k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 1.2k. The o200k_base estimate is 616. Counted again when the tool definitions change. Method.
Repository: https://github.com/ofershap/mcp-server-s3
Registry: active, updated 2026-03-10 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.87×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
presigned_url	222	119	19 %
list_objects	220	118	19 %
put_object	209	112	18 %
get_object	151	81	13 %
delete_object	144	77	13 %

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

Servers that mention ofershap.

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.