Marrow vs ChemCP
A side-by-side look at the Marrow and ChemCP MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Marrow for biology & bioinformatics work as a local process; choose ChemCP for biology & bioinformatics as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Marrow when
- You need dedicated capabilities in the Biology & Bioinformatics domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You want tools like
health_summary, list_metrics, metric_daily.
Choose ChemCP when
- You need dedicated capabilities in the Biology & Bioinformatics domain.
- You prefer a local stdio subprocess transport.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Biology & Bioinformatics | Biology & Bioinformatics |
| Quality signal | 55/100 · Good | 40/100 · Fair |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | API key required | Not declared |
| Pricing | Free | Not declared |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 3 | 2 |
| Directory activity | 3 views 0 installs 0 upvotes | 1 views 0 installs 0 upvotes |
| Tools | 9 | Not listed |
| Full listing | View Marrow | View ChemCP |
Tools & capabilities
Marrow tools 9
health_summaryRecent days across activity, heart, sleep and nutritionlist_metricsEvery metric in the mirror, with units and coveragemetric_dailyDaily values for any metric, up to 400 daysmetric_samplesRaw records with timestamps and source devicesworkoutsWorkouts from every source: activity, start, end, duration and sourcenutrition_logThe meal diary: every logged food with full nutrient detail, by daystrength_logEvery lifting set with its set type and estimated 1RM, per-exercise progression, and volume per muscle group (warm-ups left out)sleep_logOne night per wake day: bedtime, wake time, hours asleep, minutes per stagesymptoms_and_moodSymptoms with their severity, and State of Mind entries with valence, feelings and what they were about
ChemCP tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Marrow
{
"mcpServers": {
"marrow-4": {
"command": "uvx",
"args": [
"--from",
"marrow-mcp",
"marrow-server"
]
}
}
}
ChemCP
{
"mcpServers": {
"chemcp": {
"command": "npx",
"args": [
"-y",
"cloudflared"
]
}
}
}
Frequently asked questions
Marrow is categorized under Biology & Bioinformatics and uses a local stdio subprocess. ChemCP belongs to Biology & Bioinformatics and uses a local stdio subprocess. Pick Marrow for biology & bioinformatics work and ChemCP for biology & bioinformatics.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Marrow is listed as free. Auth: api key required. ChemCP has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add marrow-4 and chemcp as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Marrow has a quality signal of 55/100 (Good) with 3 views, 0 installs and 3 GitHub stars. ChemCP has 40/100 (Fair) with 1 views, 0 installs and 2 GitHub stars.