Overview
Last 24 hours
Calls
Tool calls in this window that reached a tool this server has, answered or failed. Calls to tools it lacks, resource reads and prompt gets are counted in their own cards.208
60% fewer than the 24 hours before
Error rate
Failed calls out of all calls: a result the tool marked as an error, an exception it threw, or arguments refused before it ran.20%
Elevated41 failed calls
14.0 pts higher than the 24 hours before
Response time
How long your server took to answer, measured by the SDK inside it, so the network to the client is not included. The median is the typical call; 19 in 20 calls finish within the 95th percentile.252ms
median, 1.6s at the 95th
No change from the 24 hours before
Called from
The client with the most calls, by the name it gives itself when it connects. A client can call itself anything, so the name is as reported.Claude
35% of calls, 4 other clients
Calls over time
1-hour steps
Show the numbers
| Time | Calls | Errors |
|---|---|---|
| 6 | 0 | |
| 11 | 1 | |
| 3 | 0 | |
| 30 | 6 | |
| 6 | 0 | |
| 5 | 1 | |
| 16 | 1 | |
| 7 | 0 | |
| 4 | 0 | |
| 6 | 2 | |
| 16 | 11 | |
| 26 | 14 | |
| 27 | 2 | |
| 9 | 1 | |
| 1 | 0 | |
| 5 | 0 | |
| 3 | 0 | |
| 1 | 0 | |
| 6 | 0 | |
| 3 | 0 | |
| 4 | 0 | |
| 1 | 0 | |
| 0 | 0 | |
| 6 | 1 | |
| 6 | 1 |
Tools
By calls
| Tool | Calls | ErrorsThe share of calls that failed: an error the tool reported, an exception it threw, or arguments the server refused. Calls to names the server does not have are counted apart. | MedianHow long calls took: half of them were faster than the median. p95 under it: 95 in 100 were faster, so it shows the slow tail the median hides. |
|---|---|---|---|
| search_ | 52 | 13% | 371msp95 716ms |
| get_ | 47 | 6.4% | 144msp95 351ms |
| get_ | 45 | 51% | 600msp95 2.2s |
| seat_ | 22 | 18% | 208msp95 495ms |
| book_ | 14 | 7.1% | 950msp95 1.9s |
| check_ | 12 | 25% | 306msp95 563ms |
| list_ | 11 | 0% | 65msp95 97ms |
| cancel_ | 5 | 0% | 350msp95 560ms |
This tableCSV
Versions
Tool calls by the server version that answered them
| Version | First seenWhen mcpspan first saw a call answered by this version, in the data still kept. | Calls | ErrorsThe share of calls that failed: an error the tool reported, an exception it threw, or arguments the server refused. Calls to names the server does not have are counted apart. | MedianHow long calls took: half of them were faster than the median. p95 under it: 95 in 100 were faster, so it shows the slow tail the median hides. |
|---|---|---|---|---|
| 1.4.2 | 147 | 23% | 308msp95 1.6s | |
| 1.4.1 | 50 | 14% | 201msp95 603ms |
And 11 calls from an SDK that reports no version.
What agents are shown
The tools listed to each session, and how many of those sessions used each
Each session starts by reading ≈ 2,640 tokens of tool definitions: 9 tools, 10.6 kB. 1 of them was never called in the 67 sessions shown it.Estimated at four bytes a token from each definition's name, title, description and input schema, as the server lists them. The exact count depends on the model and on how the client presents the tools. Tools left out of mcpspan are not counted.
| Tool | Shown inSessions whose client was sent this tool in the list of tools, whether or not it then called it. | Used inOf the sessions shown the tool, the share that called it at least once. Never: shown in every one of them and not called once. | TokensWhat the tool's definition takes in the model's context, every session, called or not. Estimated at four bytes a token from its name, title, description and input schema. |
|---|---|---|---|
| get_ | 67 | Never0 of 67 | ≈ 810 |
| cancel_ | 67 | 7%5 of 67 | ≈ 160 |
| check_ | 67 | 15%10 of 67 | ≈ 220 |
| list_ | 67 | 16%11 of 67 | ≈ 95 |
| book_ | 67 | 18%12 of 67 | ≈ 605 |
| seat_ | 67 | 33%22 of 67 | ≈ 153 |
| get_ | 67 | 37%25 of 67 | ≈ 103 |
| search_ | 67 | 40%27 of 67 | ≈ 365 |
| get_ | 67 | 43%29 of 67 | ≈ 130 |
Response times
Calls by how long they took
Show the numbers
| Response time | Calls | Share |
|---|---|---|
| Up to 1ms | 0 | 0.0% |
| 1ms to 2ms | 4 | 1.9% |
| 2ms to 3ms | 2 | 1.0% |
| 3ms to 5ms | 3 | 1.4% |
| 5ms to 8ms | 0 | 0.0% |
| 8ms to 12ms | 0 | 0.0% |
| 12ms to 20ms | 0 | 0.0% |
| 20ms to 30ms | 1 | 0.5% |
| 30ms to 45ms | 2 | 1.0% |
| 45ms to 65ms | 12 | 5.8% |
| 65ms to 100ms | 23 | 11.1% |
| 100ms to 150ms | 16 | 7.7% |
| 150ms to 250ms | 40 | 19.2% |
| 250ms to 400ms | 34 | 16.3% |
| 400ms to 600ms | 29 | 13.9% |
| 600ms to 1s | 19 | 9.1% |
| 1s to 1.5s | 11 | 5.3% |
| 1.5s to 2.5s | 11 | 5.3% |
| 2.5s to 4s | 1 | 0.5% |
| 4s to 6s | 0 | 0.0% |
Clients
Who called, and when
- Claude73 · 35%
- Claude Code46 · 22%
- Cursor41 · 20%
- ChatGPT14 · 6.7%
- MCP Inspector12 · 5.8%
Show the numbers
| Time | Claude | Claude Code | Cursor | ChatGPT | MCP Inspector | Other | Unidentified |
|---|---|---|---|---|---|---|---|
| 0 | 5 | 0 | 0 | 1 | 0 | 0 | |
| 0 | 4 | 6 | 1 | 0 | 0 | 0 | |
| 0 | 1 | 1 | 0 | 0 | 0 | 1 | |
| 7 | 12 | 10 | 1 | 0 | 0 | 0 | |
| 4 | 1 | 0 | 0 | 0 | 0 | 1 | |
| 1 | 0 | 3 | 0 | 0 | 0 | 1 | |
| 5 | 0 | 5 | 0 | 3 | 3 | 0 | |
| 0 | 4 | 0 | 1 | 0 | 1 | 1 | |
| 0 | 3 | 0 | 0 | 0 | 0 | 1 | |
| 0 | 0 | 5 | 0 | 0 | 1 | 0 | |
| 10 | 6 | 0 | 0 | 0 | 0 | 0 | |
| 13 | 3 | 0 | 0 | 7 | 3 | 0 | |
| 12 | 3 | 8 | 3 | 1 | 0 | 0 | |
| 5 | 0 | 0 | 0 | 0 | 3 | 1 | |
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | |
| 0 | 4 | 0 | 0 | 0 | 0 | 1 | |
| 0 | 0 | 3 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | |
| 6 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 3 | 0 | 0 | 0 | |
| 4 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 6 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 5 | 0 | 0 | 1 |
Claude
Active
7335%
Claude Code
Last call 9 hours ago
4622%
Cursor
Last call 8 hours ago
4120%
ChatGPT
Active
147%
MCP Inspector
Last call 12 hours ago
126%
Other
Last call 11 hours ago
115%
Unidentified
Active
115%
Resources and prompts
Read and got by agents
| Resource | Calls | ErrorsThe share of calls that failed: an error the tool reported, an exception it threw, or arguments the server refused. Calls to names the server does not have are counted apart. | MedianHow long calls took: half of them were faster than the median. p95 under it: 95 in 100 were faster, so it shows the slow tail the median hides. |
|---|---|---|---|
| trips://{id} | 25 | 0% | 45ms |
| config://app | 11 | 0% | 8.0ms |
| airports://{code} | 7 | 0% | 38ms |
| Prompt | Calls | ErrorsThe share of calls that failed: an error the tool reported, an exception it threw, or arguments the server refused. Calls to names the server does not have are counted apart. | MedianHow long calls took: half of them were faster than the median. p95 under it: 95 in 100 were faster, so it shows the slow tail the median hides. |
|---|---|---|---|
| plan_trip | 13 | 0% | 11ms |
| summarize_booking | 5 | 0% | 10ms |
Asked for, not on this server
By agents expecting it to exist
- Toolexport_itineraryOnly from CursorNext: stopped 22 calls, last
- Toolget_visa_requirementsOnly from MCP InspectorNext: stopped 11 call, last
- ToolsearchFlightsOnly from Claude CodeNext: get_flight_status 1Closest on this server: search_flights1 call, last
- Toolsearch_hotelsOnly from ChatGPTNext: stopped 11 call, last
- ToolseatMapOnly from Claude CodeNext: seat_map 1Closest on this server: seat_map1 call, last
- Resourcedb://Only from OtherNext: stopped 11 call, last