Overview
Last 7 days
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.2,657
Nothing to compare with in the 7 days 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.10%
Elevated269 failed calls
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.297ms
median, 1.4s at the 95th
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 Code
30% of calls, 4 other clients
Calls over time
6-hour steps
Show the numbers
| Time | Calls | Errors |
|---|---|---|
| 37 | 2 | |
| 46 | 6 | |
| 31 | 3 | |
| 44 | 5 | |
| 145 | 20 | |
| 160 | 21 | |
| 105 | 12 | |
| 37 | 6 | |
| 135 | 13 | |
| 142 | 14 | |
| 111 | 15 | |
| 35 | 9 | |
| 114 | 13 | |
| 204 | 11 | |
| 98 | 6 | |
| 36 | 1 | |
| 144 | 12 | |
| 145 | 12 | |
| 97 | 9 | |
| 42 | 7 | |
| 167 | 10 | |
| 204 | 4 | |
| 129 | 8 | |
| 23 | 1 | |
| 74 | 15 | |
| 54 | 15 | |
| 71 | 17 | |
| 15 | 0 | |
| 12 | 2 |
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_ | 858 | 11% | 403msp95 1.0s |
| get_ | 415 | 3.1% | 171msp95 439ms |
| book_ | 372 | 22% | 976msp95 2.8s |
| get_ | 345 | 9.9% | 120msp95 874ms |
| seat_ | 300 | 5.3% | 259msp95 701ms |
| list_ | 153 | 3.3% | 76msp95 174ms |
| check_ | 150 | 15% | 477msp95 1.1s |
| cancel_ | 64 | 3.1% | 592msp95 1.4s |
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 | 659 | 7.4% | 242msp95 1.1s | |
| 1.4.0 | 1,156 | 8.9% | 388msp95 1.6s | |
| 1.3.0 | 649 | 13% | 226msp95 1.1s |
And 46 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 910 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_ | 910 | Never0 of 910 | ≈ 810 |
| cancel_ | 910 | 7%64 of 910 | ≈ 160 |
| check_ | 910 | 15%136 of 910 | ≈ 220 |
| list_ | 910 | 17%153 of 910 | ≈ 95 |
| book_ | 910 | 25%227 of 910 | ≈ 605 |
| seat_ | 910 | 33%299 of 910 | ≈ 153 |
| get_ | 910 | 34%309 of 910 | ≈ 130 |
| get_ | 910 | 36%325 of 910 | ≈ 103 |
| search_ | 910 | 51%468 of 910 | ≈ 365 |
Response times
Calls by how long they took
Show the numbers
| Response time | Calls | Share |
|---|---|---|
| Up to 1ms | 6 | 0.2% |
| 1ms to 2ms | 60 | 2.3% |
| 2ms to 3ms | 28 | 1.1% |
| 3ms to 5ms | 20 | 0.8% |
| 5ms to 8ms | 1 | 0.0% |
| 8ms to 12ms | 0 | 0.0% |
| 12ms to 20ms | 0 | 0.0% |
| 20ms to 30ms | 13 | 0.5% |
| 30ms to 45ms | 16 | 0.6% |
| 45ms to 65ms | 88 | 3.3% |
| 65ms to 100ms | 208 | 7.8% |
| 100ms to 150ms | 266 | 10.0% |
| 150ms to 250ms | 467 | 17.6% |
| 250ms to 400ms | 499 | 18.8% |
| 400ms to 600ms | 385 | 14.5% |
| 600ms to 1s | 332 | 12.5% |
| 1s to 1.5s | 159 | 6.0% |
| 1.5s to 2.5s | 84 | 3.2% |
| 2.5s to 4s | 22 | 0.8% |
| 4s to 6s | 3 | 0.1% |
| 6s to 10s | 0 | 0.0% |
Clients
Who called, and when
- Claude Code810 · 30%
- Claude684 · 26%
- Cursor498 · 19%
- ChatGPT370 · 14%
- Other177 · 6.7%
Show the numbers
| Time | Claude Code | Claude | Cursor | ChatGPT | Other | MCP Inspector | Unidentified |
|---|---|---|---|---|---|---|---|
| 13 | 11 | 8 | 0 | 0 | 4 | 1 | |
| 10 | 6 | 14 | 10 | 6 | 0 | 0 | |
| 12 | 11 | 3 | 3 | 0 | 0 | 2 | |
| 18 | 9 | 7 | 6 | 3 | 0 | 1 | |
| 26 | 46 | 39 | 17 | 17 | 0 | 0 | |
| 49 | 43 | 24 | 28 | 11 | 4 | 1 | |
| 30 | 18 | 9 | 24 | 12 | 7 | 5 | |
| 12 | 2 | 13 | 7 | 1 | 0 | 2 | |
| 36 | 46 | 38 | 11 | 3 | 0 | 1 | |
| 48 | 35 | 19 | 28 | 5 | 5 | 2 | |
| 38 | 24 | 22 | 17 | 1 | 5 | 4 | |
| 3 | 9 | 4 | 6 | 8 | 3 | 2 | |
| 35 | 28 | 11 | 20 | 14 | 6 | 0 | |
| 72 | 59 | 33 | 28 | 11 | 0 | 1 | |
| 25 | 25 | 15 | 17 | 10 | 5 | 1 | |
| 16 | 12 | 4 | 0 | 0 | 3 | 1 | |
| 60 | 28 | 26 | 21 | 7 | 0 | 2 | |
| 41 | 40 | 34 | 11 | 15 | 3 | 1 | |
| 26 | 28 | 13 | 19 | 10 | 1 | 0 | |
| 18 | 9 | 6 | 3 | 4 | 0 | 2 | |
| 67 | 37 | 25 | 22 | 14 | 1 | 1 | |
| 61 | 49 | 42 | 29 | 11 | 10 | 2 | |
| 41 | 35 | 33 | 15 | 3 | 0 | 2 | |
| 1 | 1 | 9 | 8 | 0 | 3 | 1 | |
| 29 | 11 | 23 | 8 | 0 | 1 | 2 | |
| 13 | 16 | 13 | 1 | 5 | 3 | 3 | |
| 10 | 30 | 11 | 3 | 6 | 8 | 3 | |
| 0 | 10 | 0 | 3 | 0 | 0 | 2 | |
| 0 | 6 | 0 | 5 | 0 | 0 | 1 |
Claude CodeNew
First seen
81030%
ClaudeNew
First seen
68426%
CursorNew
First seen
49819%
ChatGPTNew
First seen
37014%
OtherNew
First seen
1777%
MCP InspectorNew
First seen
723%
UnidentifiedNew
First seen
462%
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} | 352 | 3.7% | 45ms |
| config://app | 153 | 0% | 8.4ms |
| airports://{code} | 92 | 0% | 47ms |
| 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 | 228 | 6.6% | 11ms |
| summarize_booking | 64 | 0% | 13ms |
Asked for, not on this server
By agents expecting it to exist
- Toolsearch_hotelsFrom Claude 5, Claude Code 5, ChatGPT 2, +3 moreNext: config://app 3, get_flight_status 3, get_weather 3, stopped 317 calls, last
- Toolexport_itineraryOnly from CursorNext: stopped 1414 calls, last
- Toolget_flight_priceFrom Cursor 5, Claude Code 4, ChatGPT 2, +2 moreNext: search_flights 12, asked again 113 calls, last
- ToolseatMapFrom Claude 6, Claude Code 5, ChatGPT 1, +1 moreNext: seat_map 11, asked again 2Closest on this server: seat_map13 calls, last
- ToolsearchFlightsFrom Claude Code 5, ChatGPT 3, Cursor 3, +1 moreNext: search_flights 8, config://app 1, get_flight_status 1, asked again 2Closest on this server: search_flights12 calls, last
- Toolget_visa_requirementsFrom Claude Code 3, Other 2, Cursor 1, +1 moreNext: get_weather 2, search_flights 2, get_flight_status 1, stopped 27 calls, last
- Resourcedb://From Claude Code 11, Claude 6, ChatGPT 4, +3 moreNext: get_flight_status 1, stopped 2930 calls, last
- PrompttranslateFrom Claude 6, Claude Code 6, Cursor 3, +2 moreNext: search_flights 5, get_flight_status 4, trips://{id} 418 calls, last