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docs(mcp-relay): list the memory each launch command costs - #127
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npx -y swarmail-mcp keeps about 180 MiB running per client, mostly the npm exec process. bunx --bun runs the same script under Bun in about 46 MiB; bunx alone still runs Node because of the script's shebang. Measured on one Linux machine with the relay idle after a first request.
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Priority: ⬇️ Low Merge Risk: ⚪ Minimal · up to The documentation distinguishes the Bun launch command from the Node-only checked-in tests. No issue identified here prevents merging. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 2 systems. Changed systems: Architecture concerns Review details
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| Check name | Status | Explanation |
|---|---|---|
| Description check |  |
The description clearly explains the documentation change, memory measurements, test results, scope, and measurement limits. It does not reproduce the template checklist, but it provides the required … |
| Title check | |
The title clearly and concisely describes the main change: documenting memory usage for each MCP relay launch command. |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
| Suppressions Explained | |
The pull request changes only CHANGELOG.md and packages/mcp-relay/README.md. The added lines contain documentation only and add no lint, type-check, formatter, or configuration suppression directive. |
| Interface Changes Documented | |
The pull request changes only CHANGELOG.md and packages/mcp-relay/README.md. The diff adds memory documentation and mentions existing launch commands and --bun; it does not add, remove, or renam… |
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Inline comments:
Review comments at @packages/mcp-relay/README.md:
- Around line 23-35: Update the runtime test claim in the README to state that
the checked-in relay tests run the relay under Node and do not exercise Bun;
remove the claim that both runtimes pass the same tests.
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The
swarmail-mcpREADME now says what each launch command costs in memory, and thatbunx --bun swarmail-mcpruns the relay under Bun for about a quarter of thenpxfigure.Whole process tree, relay idle after one request, one Linux machine, published
swarmail-mcp0.5.1 against a stub server:npx -y swarmail-mcpnpm exec110.1, shell 2.1, Node 67.7bunx swarmail-mcpbunx14.6, Node 67.7bunx --bun swarmail-mcpbunx14.5, Bun 31.9bunxwithout--bunstill runs Node because the script's#!/usr/bin/env nodeline wins. The unchangedindex.mjspasses the five relay tests under Node (the repository's harness) and, run through a copy of that harness, under Bun; the README says only that the checked-in tests use Node. No code changes;bun run checkpasses.The numbers are one machine and one run each, so the README says "about". The package version and the plugin copies of the relay are untouched.
Summary by CodeRabbit
npx -y swarmail-mcp, 82 MiB withbunx swarmail-mcp, and 46 MiB withbunx --bun swarmail-mcp.bunxruns the relay under Node by default, while--bunruns it under Bun and requires Bun to be installed. The relay works unchanged under either runtime; repository tests run under Node.