Sigil vs Aga MCP Server
A side-by-side look at the Sigil and Aga 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 Sigil for cryptography work; choose Aga MCP Server for cryptography as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Sigil when
- You need dedicated capabilities in the Cryptography domain.
- You have the keys it needs:
SIGIL_HOME, SIGIL_CONTROL_DIR.
Choose Aga MCP Server when
- You need dedicated capabilities in the Cryptography domain.
- You prefer a local stdio subprocess transport.
- You want tools like
get_server_info, get_portal_state, init_chain.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Cryptography | Cryptography |
| Quality signal | 35/100 · Fair | 61/100 · Good |
| Install command | Not confirmed yet | Confirmed |
| Transport | — | Local subprocess (stdio) |
| Auth | Not declared | Not declared |
| Pricing | Not declared | Not declared |
| Required env vars | SIGIL_HOMESIGIL_CONTROL_DIR | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 3 | 0 |
| Directory activity | 1 views 0 installs 0 upvotes | 1 views 0 installs 0 upvotes |
| Tools | Not listed | 15 |
| Full listing | View Sigil | View Aga MCP Server |
Tools & capabilities
Sigil tools
No tool names declared yet. Check the project README from the listing page.
Aga MCP Server tools 15
get_server_infoGet AGA server info, public keys, and portal state.get_portal_stateGet current portal state, loaded artifact info, and enforcement status.init_chainInitialize continuity chain with genesis event.attest_subjectAttest subject, generate sealed Policy Artifact. Auto-loads into portal.measure_integrityMeasure subject state, compare to sealed reference. Generates signed receipt for every measurement.revoke_artifactRevoke an active policy artifact mid-session. Portal terminates on next measurement. (NCCoE Phase 3b)verify_chainVerify continuity chain integrity.generate_evidence_bundleExport the canonical SEP evidence bundle: signed PERMITTED/DENIED tool-call receipts + Merkle proofs + a mandatory signed checkpoint, for offline third-party verification (verify_bundle_offline, aga-verify, or aga-receipt-spec/verify/verify-sep.mjs). Pin gateway_public_key to prove provenance.verify_bundle_offlineVerify a canonical SEP evidence bundle offline (full §6 algorithm: structural floor, receipt signatures, chain+ordering, leaf-recompute + Merkle bijection, signed checkpoint). Pass pinned_public_key to also prove provenance.request_claimRequest disclosure of a claim. Auto-substitutes if denied.list_claimsList available claims with sensitivity levels.delegate_to_subagentDerive a constrained policy artifact for a sub-agent. Scope can only diminish, never expand. (NCCoE constrained delegation)- +3 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.
Sigil
No confirmed install command for Sigil yet — follow the setup steps linked from its listing page rather than a guessed package name.
Aga MCP Server
{
"mcpServers": {
"aga-mcp-server": {
"command": "npx",
"args": [
"-y",
"@attested-intelligence/aga-mcp-server@3.6.6"
]
}
}
}
Frequently asked questions
Sigil is categorized under Cryptography and uses an install path we have not confirmed yet. Aga MCP Server belongs to Cryptography and uses a local stdio subprocess. Pick Sigil for cryptography work and Aga MCP Server for cryptography.
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. Sigil has no confirmed install command yet — follow its own setup instructions.
Sigil has no declared pricing — check the project's own site. Aga MCP Server 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 sigil-2 and aga-mcp-server as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Sigil has a quality signal of 35/100 (Fair) with 1 views, 0 installs and 3 GitHub stars. Aga MCP Server has 61/100 (Good) with 1 views, 0 installs and 0 GitHub stars.