Graft vs Rotifer MCP Server
A side-by-side look at the Graft and Rotifer MCP Server MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Graft for coding agents work as a local process; choose Rotifer MCP Server for coding agents as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Graft when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You have the keys it needs:
GRAFT_ROOT_PATH. - You want tools like
safe_read, graft_edit, file_outline.
Choose Rotifer MCP Server when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
search_genes, get_gene_detail, get_arena_rankings.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Coding Agents | Coding Agents |
| Quality signal | 65/100 · Great | 63/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | No auth required | No auth required |
| Pricing | Free | Free |
| Required env vars | GRAFT_ROOT_PATH | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 17 | 1 |
| Directory activity | 1 views 0 installs 0 upvotes | 1 views 0 installs 0 upvotes |
| Tools | 34 | 31 |
| Full listing | View Graft | View Rotifer MCP Server |
Tools & capabilities
Graft tools 34
safe_readPolicy-enforced file read. Returns full content for small files, structural outline with jump table for large files, or refusal with reason code for banned files. Detects re-reads and returns cached outlines or structural diffs.graft_editPerform one governed exact string replacement in a repo file. Requires path, old_string, and new_string. Refuses missing or ambiguous old_string matches and policy-denied paths.file_outlineStructural skeleton of a file — function signatures, class shapes, exports. Includes a jump table mapping each symbol to its line range for targeted read_range follow-ups.read_rangeRead a bounded range of lines from a file. Maximum 250 lines. Use jump table entries from file_outline or safe_read to target specific symbols.changed_sinceCheck if a file changed since it was last read. Returns structural diff (added/removed/changed symbols) or 'unchanged'. Peek mode by default; pass consume: true to update the observation cache.graft_diffStructural diff between two git refs. Shows added, removed, and changed symbols per file — not line hunks. Defaults to working tree vs HEAD.run_captureExecute a shell command and return the last N lines of output (default 60). Responses include an explicit policy boundary. Persisted logs can be disabled and obvious secrets are redacted before writing to .graft/logs/capture.log.state_saveSave session working state (max 8 KB). Use for session bookmarks: current task, files modified, next planned actions.state_loadLoad previously saved session state. Returns null if no state has been saved.doctorRuntime health check. Shows project root, parser status, active thresholds, session depth, message count, and burden summary.activity_viewInspect recent bounded local artifact history for the active workspace, anchored to the current commit when possible.causal_statusInspect the active causal workspace and persisted local-history posture.- +22 more on the listing page
Rotifer MCP Server tools 31
search_genesSearch the Rotifer Gene ecosystem. Returns a list of Genes matching the query, filterable by domain and fidelity.get_gene_detailGet detailed information about a specific Gene by its ID or content_hash, including phenotype, fitness, and metadata. At least one of gene_id or content_hash must be provided.get_arena_rankingsGet Arena rankings for a domain. Each row carries a tier — `verified` (measured in a sandbox, with enough independent callers to stand), `under_evaluation` (measured, not yet corroborated), `not_evaluated` (disqualified, or a number that was estimated rather than measured) — and `rank` is null wherever the tier grants no rank. Prefer `verified` when picking a Gene for a capability; an estimated or disqualified number is not a measurement of anything. Also returns F(g) before and after the fidelity discount, safety, success_rate, latency, resource_efficiency, sample size and unique callers.compare_genesCompare two or more Genes by their F(g) fitness metrics. Returns side-by-side fitness breakdown.get_gene_statsGet download statistics for a Gene, broken down by time period (total, last 7 days, 30 days, 90 days).get_leaderboardGet the creator reputation leaderboard. Shows top creators ranked by reputation score, including their published gene count, total downloads, and arena wins.get_developer_profileGet a creator's public profile and reputation data by username.list_local_genesList Genes installed in the local project workspace. Scans the genes/ directory for phenotype.json files and returns metadata, compile status, and cloud origin for each Gene.list_local_agentsList Agents registered in the local project workspace. Returns each Agent's name, state, genome composition, strategy, and reputation. Agents are local constructs that compose multiple Genes into pipelines.install_geneInstall a Gene from the Rotifer Cloud Registry into the local project. Downloads phenotype, metadata, and the compiled WASM artifact (verified against declared size and sha256) when the gene has one. Requires a valid gene_id from search_genes or get_gene_detail.rollback_geneUndo the last overwrite of a locally installed Gene, restoring the copy that install_gene replaced. Call without gene_name to list what can currently be rolled back. A rollback consumes its snapshot: it undoes one step, not a history.arena_submitMeasure a local Gene in the sandbox and submit the measured result to the Arena. Requires authentication (rotifer login) and a Gene that exists locally — use list_local_genes to see them, install_gene to fetch one. The fitness scores are produced by running the Gene, not supplied by the caller: passing fitness_value, safety_score, success_rate, latency_score or resource_efficiency is refused. Runs `rotifer arena submit <gene> --cloud`.- +19 more on 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.
Graft
{
"mcpServers": {
"flyingrobots-graft": {
"command": "npx",
"args": [
"-y",
"@flyingrobots/graft"
],
"env": {
"GRAFT_ROOT_PATH": "YOUR_GRAFT_ROOT_PATH_HERE"
}
}
}
}
Rotifer MCP Server
{
"mcpServers": {
"mcp-server-157": {
"command": "npx",
"args": [
"@rotifer/mcp-server"
]
}
}
}
Frequently asked questions
Graft is categorized under Coding Agents and uses a local stdio subprocess. Rotifer MCP Server belongs to Coding Agents and uses a local stdio subprocess. Pick Graft for coding agents work and Rotifer MCP Server for coding agents.
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.
Graft is listed as free. Auth: no auth required. Rotifer MCP Server is listed as free. Auth: no auth required. 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 flyingrobots-graft and mcp-server-157 as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Graft has a quality signal of 65/100 (Great) with 1 views, 0 installs and 17 GitHub stars. Rotifer MCP Server has 63/100 (Good) with 1 views, 0 installs and 1 GitHub stars.