concordia-protocol vs sigelo
concordia-protocol is a plugin bundle for AI coding tools published by eriknewton. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). sigelo is an MCP server published by csigelo. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-16. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  concordia-protocol |  sigelo |
|---|---|---|
| Claude Code: claude-plugins-community | Listed Version: 0.1.0 Forks (GitHub): 0 Stars (GitHub): 6 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.1.7 Downloads/month (npm): 227 Downloads/week (npm): 61 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | concordia-protocol | sigelo |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 6 (better) | 0 (worse) |
| Forks (GitHub) | 0 | 0 |
| Last release (differs) | Not published | 2026-10-15 |
| Where it runs (differs) | Installs as a plugin bundle | Remote server (sigelo.io/mcp) |
| Transport (differs) | Not stated | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | Not published | 3, secrets among them: 1 |
| Parts of the bundle (differs) | 2 | Not a bundle |
| Licence (differs) | Apache-2.0 | Not stated |
| Repository (differs) | github.com/eriknewton/concordia-protocol | github.com/csigelo/sigelo |
| Changes in the last 7 days (differs) | 0 | 6 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | no remote endpoint we check | not checked yet |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
concordia-protocol
Structured negotiation protocol for autonomous agents. Gives your agent binding commitments, multi-attribute offers (basic, partial, conditional, bundle), session receipts, portable reputation, and agent discovery — all as MCP tools. Supports a six-state session lifecycle with Ed25519-signed, hash-chained message transcripts.
sigelo
Portable, offline-verifiable identity for AI agents: DID, challenges, attestations, bundles.
How to run each
concordia-protocol As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install concordia-protocol@claude-communitysigelo As a remote MCP server
claude mcp add --transport http sigelo https://sigelo.io/mcpRequires: SIGELO_WALLET_TOKEN (secret)
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
The marketplaces of concordia-protocol publish no settings it asks for, so we do not compare settings.
What it can do: concordia-protocol · What it can do: sigelo · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.