FaultKey · CausalLayer vs Melta UI
A side-by-side look at the FaultKey · CausalLayer and Melta UI MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose FaultKey · CausalLayer for legal work as a local process; choose Melta UI for legal as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose FaultKey · CausalLayer when
- You need dedicated capabilities in the Legal domain.
- You prefer a local stdio subprocess transport.
- You want tools like
submit_incident, verify_certificate, get_anchor_status.
Choose Melta UI when
- You need dedicated capabilities in the Legal domain.
- You prefer a local stdio subprocess transport.
- You want tools like
get_token, get_component, check_rule.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Legal | Legal |
| Quality signal | 53/100 · Good | 69/100 · Great |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | Not declared |
| Pricing | Not declared | Not declared |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 2 | 202 |
| Directory activity | 2 views 0 installs 0 upvotes | 4 views 0 installs 0 upvotes |
| Tools | 4 | 6 |
| Full listing | View FaultKey · CausalLayer | View Melta UI |
Tools & capabilities
FaultKey · CausalLayer tools 4
submit_incidentSubmit an AI incident for deterministic liability attribution. Returns a signed `CausalCertificateV1` with per-agent fault allocation, evidence-chain completeness, and Bitcoin-anchored proof.verify_certificateIndependently verify a certificate (signature, Merkle integrity, issuer status) without calling FaultKey.get_anchor_statusReturn the index of all Tessera anchor batches or one batch's full JSON (signed Merkle root, OpenTimestamps proof reference).query_issuer_registryList all trusted CausalLayer issuer public-key fingerprints, status, and validity windows.
Melta UI tools 6
get_tokenGet a design token by dot-path. Returns the token object with its value and class mapping.get_componentGet component metadata including variants, sizes, accessibility requirements, HTML sample, per-state specs (stateSpecs: disabled/loading/open/empty etc. — each with delta class strings + aria changes), and anatomy parts (overlay/container/th etc. with element/roles/class). Prefer these structured fields over inferring states from the HTML sample.check_ruleCheck class strings against this design system's prohibition rules. Returns violations with reasons and alternatives.check_htmlLint a full HTML/JSX source against melta-ui rules — the same checks as CI and the PostToolUse hook (class rules + html-attr rules + composition rules for HTML). Use this AFTER generating UI code to self-verify before presenting it. Response always includes coverage info (manual rules cannot be auto-checked).searchSearch across tokens and components by keyword. Matches against names, values, class strings, and descriptions. Returns up to 20 results (truncated flag when more matched).get_rulesGet melta-ui prohibition rules from rules.json (107 total). Use this to retrieve manual/contextual rules that check_rule cannot auto-detect. Supports filtering by category, severity, or detector.
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.
FaultKey · CausalLayer
{
"mcpServers": {
"faultkey-causallayer": {
"command": "npx",
"args": [
"-y",
"causallayer-mcp"
]
}
}
}
Melta UI
{
"mcpServers": {
"melta-ui": {
"command": "npx",
"args": [
"-y",
"melta-ds-mcp"
]
}
}
}
Frequently asked questions
FaultKey · CausalLayer is categorized under Legal and uses a local stdio subprocess. Melta UI belongs to Legal and uses a local stdio subprocess. Pick FaultKey · CausalLayer for legal work and Melta UI for legal.
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.
FaultKey · CausalLayer has no declared pricing — check the project's own site. Melta UI 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 faultkey-causallayer and melta-ui as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, FaultKey · CausalLayer has a quality signal of 53/100 (Good) with 2 views, 0 installs and 2 GitHub stars. Melta UI has 69/100 (Great) with 4 views, 0 installs and 202 GitHub stars.