{"id":"alexwangda-s3-mcp-server-java","name":"s3-mcp-server-java","af_score":35.8,"security_score":41.0,"reliability_score":17.5,"what_it_does":"Provides an MCP (Model Context Protocol) STDIO server (Spring AI based) that exposes S3-style operations (bucket and object management plus presigned URL generation) against Amazon S3 and S3-compatible object storage systems.","best_when":"You want an agent-friendly way to bridge MCP tools to S3-compatible storage using a local STDIO MCP server process.","avoid_when":"You cannot control/limit the IAM permissions of the access keys used by the MCP server, or you need publicly auditable API contracts and operational guarantees beyond basic README-level documentation.","last_evaluated":"2026-04-04T20:00:00.344526+00:00","has_mcp":true,"has_api":false,"auth_methods":["AWS-style access key/secret key for S3 API authentication"],"has_free_tier":false,"known_gotchas":["Credentials are passed as command-line args in the example; agents should avoid logging process arguments and prefer safer secret injection methods (env vars/secret files) when running the server.","Object listing/pagination semantics depend on S3-compatible provider behavior; the README mentions NextMarker but does not describe edge-case handling (e.g., marker correctness across providers/versions).","Download/upload paths are specified in tool calls; agents must ensure correct local filesystem permissions and avoid path traversal/unsafe filenames."],"error_quality":0.0}