ONCE — Exactly-Once Reliability for AI Agent Actions vs io.github.imran-siddique/agentos
ONCE — Exactly-Once Reliability for AI Agent Actions is an MCP server published by GSterlingPress. Marketplaces we read that list it: 1 (Official MCP Registry). io.github.imran-siddique/agentos is an MCP server published by imran-siddique. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-19. 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 |  ONCE — Exactly-Once Reliability for AI Agent Actions |  io.github.imran-siddique/agentos |
|---|---|---|
| Official MCP Registry | Listed Version: 0.8.4 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Listed Version: 1.0.1 Downloads/month (npm): 193 Downloads/week (npm): 22 Forks (GitHub): 26 Stars (GitHub): 74 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 | ONCE — Exactly-Once Reliability for AI Agent Actions | io.github.imran-siddique/agentos |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 0 (worse) | 74 (better) |
| Forks (GitHub) (differs) | 0 (worse) | 26 (better) |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (optimistic-compassion-production.up.railway.app/mcp) | On your machine (agentos-mcp-server) |
| Transport (differs) | Streamable HTTP | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | Not published | 2, secrets among them: 0 |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/gsterlingpress/once-api | github.com/imran-siddique/agent-os |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Responded 4 days ago | no remote endpoint we check |
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
ONCE — Exactly-Once Reliability for AI Agent Actions
Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.
io.github.imran-siddique/agentos
Build and manage policy-compliant AI agents with safety enforcement and compliance checking
How to run each
ONCE — Exactly-Once Reliability for AI Agent Actions As a remote MCP server
claude mcp add --transport http once https://optimistic-compassion-production.up.railway.app/mcpio.github.imran-siddique/agentos As a local MCP server: npm package
claude mcp add --transport stdio agentos -- npx -y agentos-mcp-serverCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only ONCE — Exactly-Once Reliability for AI Agent Actions has a remote endpoint we check. How we check endpoints
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 ONCE — Exactly-Once Reliability for AI Agent Actions publish no settings it asks for, so we do not compare settings.
What it can do: ONCE — Exactly-Once Reliability for AI Agent Actions · What it can do: io.github.imran-siddique/agentos · Compare two other plugins
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.