io.github.sadri-dridi/agent-first-listing
Agent First Listing
Agent-first product listing: JSON catalog, agent card, MCP door, hops, measured landings.
alive probed 2026-10-05 · HTTP 200
31tools
13ktokens in Claude Opus 5.5
13ktokens in Claude Code
6.6 %of a 200k context window
7.5ko200k_base estimate
63 msto initialize
47 msto list tools
- Endpoint
- https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/agent-first-listing/mcp (streamable-http)
- Host
- agent-observatory-sensor.nolimit-observatory.workers.dev
- Protocol
- 2025-03-26
- Reports itself as
- Agent First Listing 3.0.0
- Capabilities
- tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-05. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/sadri-dridi/named-mcp-utilities
- Website
- https://agent-ads-production-9f45.up.railway.app/
- Registry
- active, updated 2026-09-23 · registry entry
- Reachable
- 6 of the last 6 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| agent-ads-index | 295 | 4 % |
| agent-first-listing | 284 | 4 % |
| agent-tool-index | 277 | 4 % |
| people-search-index | 272 | 4 % |
| normalize-url | 240 | 3 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-05 15:37 | alive | 63 ms | 31 | 13k | 7.5k |
| 2026-10-05 00:46 | alive | 21 ms | 31 | 7.5k | |
| 2026-10-04 10:07 | alive | 28 ms | 31 | 7.5k | |
| 2026-10-04 08:00 | alive | 21 ms | 31 | 7.5k | |
| 2026-10-03 20:39 | alive | 109 ms | 31 | 7.5k | |
| 2026-10-03 17:55 | alive | 88 ms | 31 | 7.5k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.sadri-dridi/agent-first-listing)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.