Measure You.com MCP you-search callTool result size: 100 jittered calls (~25 min) + clickhouse-local analysis + hash-batch content confirmation

analyze.sql

-- ClickHouse-local analysis for the You.com MCP you-search size probe.
--
-- Run with the clickhouse-local binary (v26.9 tested):
--
--   clickhouse local --multiquery < analyze.sql
--   clickhouse local --multiquery --queries-file=analyze.sql
--
--   # or, with clickhousectl:
--   clickhousectl local use latest
--   "$(clickhousectl local which --json | jq -r .binary_path)" local --multiquery < analyze.sql
--
-- Expects these files in the working directory:
--   results.jsonl      -- 100-call timed run (search-size.ts)      [one JSON line per call]
--   hash-batch.jsonl    -- 30-call hash confirmation (hash-batch.ts) [one JSON line per call]
--
-- See the gist for the scripts that produced them.

SET format = 'PrettyCompact';
SET max_block_size = 1;

-- ---------------------------------------------------------------------------
-- 1. Timed run overview (results.jsonl)
-- ---------------------------------------------------------------------------
SELECT
    count()                                                       AS n,
    countIf(isError)                                              AS errors,
    min(bytes)                                                    AS min_bytes,
    max(bytes)                                                    AS max_bytes,
    max(bytes) - min(bytes)                                       AS byte_range,
    round(avg(bytes), 2)                                          AS avg_bytes,
    round(stddevPop(bytes), 4)                                    AS sd_bytes,
    round(quantile(0.5)(bytes), 0)                                AS p50_bytes,
    round(quantile(0.9)(bytes), 0)                                AS p90_bytes,
    round(quantile(0.99)(bytes), 0)                               AS p99_bytes,
    round(min(actualOffsetMs) / 60000, 2)                         AS first_min,
    round(max(actualOffsetMs) / 60000, 2)                         AS last_min,
    round((max(actualOffsetMs) - min(actualOffsetMs)) / 60000, 2) AS span_min,
    round(avg(durationMs), 0)                                      AS avg_duration_ms,
    max(durationMs)                                                AS max_duration_ms
FROM file('results.jsonl', JSONEachRow)
;

-- ---------------------------------------------------------------------------
-- 2. Per-field byte distribution (which field wobbles, which is constant)
-- ---------------------------------------------------------------------------
SELECT
    perField.content            AS content_bytes,
    perField.structuredContent  AS sc_bytes,
    perField._meta              AS meta_bytes,
    count()                     AS n
FROM file('results.jsonl', JSONEachRow)
GROUP BY content_bytes, sc_bytes, meta_bytes
ORDER BY content_bytes, sc_bytes
;

-- ---------------------------------------------------------------------------
-- 3. Timing / spacing correlation with size (does the gap matter?)
-- ---------------------------------------------------------------------------
SELECT
    round(corr(actualOffsetMs, bytes), 4)      AS corr_time_bytes,
    round(corr(actualOffsetMs, durationMs), 4) AS corr_time_dur,
    round(corr(delayBeforeMs, durationMs), 4)  AS corr_gap_dur,
    round(corr(delayBeforeMs, bytes), 4)       AS corr_gap_bytes,
    round(corr(index, bytes), 4)               AS corr_index_bytes
FROM file('results.jsonl', JSONEachRow)
;

-- ---------------------------------------------------------------------------
-- 4. Gap histogram (minutes between successive calls) — jitter check
-- ---------------------------------------------------------------------------
SELECT
    round(gap_min, 2) AS gap_min,
    count()           AS n
FROM (
    SELECT
        (actualOffsetMs - lagInFrame(actualOffsetMs) OVER (ORDER BY index)) / 60000 AS gap_min
    FROM file('results.jsonl', JSONEachRow)
)
WHERE gap_min >= 0
GROUP BY gap_min
ORDER BY gap_min
;

-- ---------------------------------------------------------------------------
-- 5. Definitive 'same data?' answer (hash-batch.jsonl)
--    1 distinct webResultsHash => the actual search results are identical
--    every call; only per-request metadata (search_uuid, latency) changes.
-- ---------------------------------------------------------------------------
SELECT
    count()                                    AS n,
    uniqExact(webResultsHash)                  AS distinct_web_hashes,
    uniqExact(textHash)                        AS distinct_text_hashes,
    uniqExact(searchUuid)                       AS distinct_uuids,
    uniqExact(latency)                          AS distinct_latencies,
    uniqExact(webHitCount)                     AS distinct_hit_counts,
    any(webHitCount)                            AS hits_per_call,
    min(bytes)                                 AS min_bytes,
    max(bytes)                                 AS max_bytes
FROM file('hash-batch.jsonl', JSONEachRow)
;

-- ---------------------------------------------------------------------------
-- 6. The single web-results hash that every call produced
-- ---------------------------------------------------------------------------
SELECT webResultsHash, count() AS n
FROM file('hash-batch.jsonl', JSONEachRow)
GROUP BY webResultsHash
ORDER BY n DESC
;

-- ---------------------------------------------------------------------------
-- 7. Why textHash varies while webResultsHash doesn't: the only
--    per-request variance inside the text payload is the latency float's
--    serialized length (the search_uuid is a fixed-length UUID).
-- ---------------------------------------------------------------------------
SELECT
    count()                          AS n,
    uniqExact(webBytes)              AS distinct_webBytes,
    min(webBytes)                    AS min_webBytes,
    max(webBytes)                    AS max_webBytes,
    uniqExact(textBytes)            AS distinct_textBytes,
    min(textBytes)                   AS min_textBytes,
    max(textBytes)                   AS max_textBytes
FROM file('hash-batch.jsonl', JSONEachRow)
;

hash-batch.jsonl

{"index":0,"iso":"2026-09-11T17:07:11.308Z","durationMs":1697,"bytes":62449,"textHash":"b1e326360d294714","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"96c80730-e4b0-486c-b346-c2a379b1dd2b","latency":0.001692911027930677,"textBytes":30641,"webBytes":30399}
{"index":1,"iso":"2026-09-11T17:07:11.735Z","durationMs":425,"bytes":62451,"textHash":"03992a0521ed670d","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"30165275-063a-4d90-813c-77071f2b2253","latency":0.0015743750846013427,"textBytes":30642,"webBytes":30399}
{"index":2,"iso":"2026-09-11T17:07:12.238Z","durationMs":503,"bytes":62451,"textHash":"3b1bbbb1e30fd668","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"c24ac149-1ac6-4655-9dba-3532b977f86d","latency":0.0014118379913270473,"textBytes":30642,"webBytes":30399}
{"index":3,"iso":"2026-09-11T17:07:12.640Z","durationMs":401,"bytes":62451,"textHash":"c1d7d53239c3e255","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"d20a8dea-1099-4f33-960b-e2b3265453bc","latency":0.0015834909863770008,"textBytes":30642,"webBytes":30399}
{"index":4,"iso":"2026-09-11T17:07:13.060Z","durationMs":420,"bytes":62449,"textHash":"c817f968230bb258","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"b01d9006-f33a-4a47-bc0a-1ffd340e0f5d","latency":0.002005817979807034,"textBytes":30641,"webBytes":30399}
{"index":5,"iso":"2026-09-11T17:07:13.445Z","durationMs":385,"bytes":62451,"textHash":"6c0b6e4166d5fd98","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"89c454bd-d633-4eef-b366-668dafcd3e1b","latency":0.0011766139650717378,"textBytes":30642,"webBytes":30399}
{"index":6,"iso":"2026-09-11T17:07:13.832Z","durationMs":386,"bytes":62451,"textHash":"905d698208ba5c9a","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"491bea03-3d76-44d3-9467-cf7c7cabdb19","latency":0.0017678949516266584,"textBytes":30642,"webBytes":30399}
{"index":7,"iso":"2026-09-11T17:07:14.229Z","durationMs":396,"bytes":62451,"textHash":"9f9d6a9341412a27","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"b029df20-f98b-4a06-a774-1f05cf1a1887","latency":0.0014917760854586959,"textBytes":30642,"webBytes":30399}
{"index":8,"iso":"2026-09-11T17:07:14.585Z","durationMs":356,"bytes":62451,"textHash":"6619c090bae360dd","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"b8f7dee2-f5c9-4551-99de-49b2b5d625cb","latency":0.0017554599326103926,"textBytes":30642,"webBytes":30399}
{"index":9,"iso":"2026-09-11T17:07:15.022Z","durationMs":436,"bytes":62451,"textHash":"2979f09fb6990189","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"ce088de9-e4f5-44d1-8072-6aa8a360caf5","latency":0.0015400709817185998,"textBytes":30642,"webBytes":30399}
{"index":10,"iso":"2026-09-11T17:07:15.430Z","durationMs":406,"bytes":62449,"textHash":"392fe7fc93235e61","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"b0f3c8fc-7a38-4684-85a5-f11efccb7dc2","latency":0.001549395965412259,"textBytes":30641,"webBytes":30399}
{"index":11,"iso":"2026-09-11T17:07:15.776Z","durationMs":345,"bytes":62451,"textHash":"8881315e90a90aed","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"eda46713-1e18-46f5-b872-6f4ad7a20db7","latency":0.0014544569421559572,"textBytes":30642,"webBytes":30399}
{"index":12,"iso":"2026-09-11T17:07:16.146Z","durationMs":369,"bytes":62451,"textHash":"716ff4fccc342027","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"9d802fc5-a569-4b6d-94eb-3ce418c53c52","latency":0.0011207719799131155,"textBytes":30642,"webBytes":30399}
{"index":13,"iso":"2026-09-11T17:07:16.482Z","durationMs":336,"bytes":62451,"textHash":"1cb1efa838a1ed2d","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"2c93a252-0f78-4e49-97c9-01c48ee6f20c","latency":0.0015484309988096356,"textBytes":30642,"webBytes":30399}
{"index":14,"iso":"2026-09-11T17:07:16.886Z","durationMs":403,"bytes":62451,"textHash":"172cb8614e2bb6da","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"44b97129-d9c9-45f3-9f6f-d8e850178027","latency":0.0011315519222989678,"textBytes":30642,"webBytes":30399}
{"index":15,"iso":"2026-09-11T17:07:17.315Z","durationMs":428,"bytes":62451,"textHash":"1f9a9f99b54415df","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"10a772d5-6a76-4766-9151-87d437123e48","latency":0.0016508489934494719,"textBytes":30642,"webBytes":30399}
{"index":16,"iso":"2026-09-11T17:07:17.750Z","durationMs":434,"bytes":62451,"textHash":"28f06e21a72af22f","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"083f8a55-10c7-46d4-8686-81884fee739f","latency":0.0015790869947522879,"textBytes":30642,"webBytes":30399}
{"index":17,"iso":"2026-09-11T17:07:18.114Z","durationMs":363,"bytes":62449,"textHash":"d6e5a252b1154a64","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"4a44687f-ecfe-4d77-a89c-fb329baf3b49","latency":0.001198271056637168,"textBytes":30641,"webBytes":30399}
{"index":18,"iso":"2026-09-11T17:07:18.524Z","durationMs":409,"bytes":62451,"textHash":"3756aa37c084e53b","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"4296caee-6e22-4298-aa3e-5d360ec16fc7","latency":0.0017938660457730293,"textBytes":30642,"webBytes":30399}
{"index":19,"iso":"2026-09-11T17:07:18.897Z","durationMs":373,"bytes":62449,"textHash":"b4c1c6d180e1452b","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"87498986-b7b1-4ace-9ebe-0874949fa23f","latency":0.001545920968055725,"textBytes":30641,"webBytes":30399}
{"index":20,"iso":"2026-09-11T17:07:19.308Z","durationMs":409,"bytes":62451,"textHash":"b0a1fb399600d209","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"e73ff65a-6d5c-4a0e-a5d7-6d37e3b1eb0d","latency":0.0017303430940955877,"textBytes":30642,"webBytes":30399}
{"index":21,"iso":"2026-09-11T17:07:19.758Z","durationMs":449,"bytes":62451,"textHash":"eca25e62f2641334","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"7de136ce-810f-4a16-8086-e32b280f48c7","latency":0.0015693489694967866,"textBytes":30642,"webBytes":30399}
{"index":22,"iso":"2026-09-11T17:07:20.177Z","durationMs":417,"bytes":62449,"textHash":"f11833da998304b6","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"a22954f4-195f-4549-b9b6-2a2b051964b1","latency":0.001969838049262762,"textBytes":30641,"webBytes":30399}
{"index":23,"iso":"2026-09-11T17:07:20.508Z","durationMs":331,"bytes":62451,"textHash":"a36fba5670231ba7","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"2daecdbe-88bb-4fa5-9658-1b10feee9493","latency":0.0015628819819539785,"textBytes":30642,"webBytes":30399}
{"index":24,"iso":"2026-09-11T17:07:20.832Z","durationMs":323,"bytes":62449,"textHash":"b4464c64256626fa","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"70a4e733-9a42-4628-8ae9-d9b3a597fdeb","latency":0.001594342989847064,"textBytes":30641,"webBytes":30399}
{"index":25,"iso":"2026-09-11T17:07:21.137Z","durationMs":304,"bytes":62449,"textHash":"aeeacfe3085a5e39","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"51e04cb0-7d37-485c-99cd-86b3215807bd","latency":0.001038353075273335,"textBytes":30641,"webBytes":30399}
{"index":26,"iso":"2026-09-11T17:07:21.495Z","durationMs":358,"bytes":62451,"textHash":"c23e4c76757f2957","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"b8cc5355-9757-41aa-ac1c-15fde5e40d9b","latency":0.0010949739953503013,"textBytes":30642,"webBytes":30399}
{"index":27,"iso":"2026-09-11T17:07:21.856Z","durationMs":360,"bytes":62451,"textHash":"3f0542eacc531608","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"3d36ebed-6536-401d-8e88-8047c170ee5d","latency":0.0010992190800607204,"textBytes":30642,"webBytes":30399}
{"index":28,"iso":"2026-09-11T17:07:22.215Z","durationMs":359,"bytes":62451,"textHash":"3db4f640af8ec652","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"f01033e3-0b58-406a-b8fb-4d806dd46638","latency":0.0019189330050721765,"textBytes":30642,"webBytes":30399}
{"index":29,"iso":"2026-09-11T17:07:22.609Z","durationMs":394,"bytes":62451,"textHash":"077a132314f07d67","webResultsHash":"d52941ed4617f205","webHitCount":13,"searchUuid":"8a7b59c0-50a0-4ebb-ba49-6f563241205a","latency":0.0019348030909895897,"textBytes":30642,"webBytes":30399}

hash-batch.ts

import { Client, StreamableHTTPClientTransport } from '@modelcontextprotocol/client'
import { createHash } from 'node:crypto'
const SERVER_URL = process.env.YDC_API_URL ?? 'https://api.you.com/mcp'
const API_KEY = process.env.YDC_API_KEY!
const QUERY = 'What is the top story on Hacker News right now? You must use the search tool. Answer with the exact title and URL.'
const N = Number(process.env.HB_N ?? 30)

const call = async () => {
  const t = new StreamableHTTPClientTransport(new URL(SERVER_URL), {
    requestInit: { headers: { Authorization: `Bearer ${API_KEY}` } },
  })
  const c = new Client({ name: 'hash-batch', version: '1.0.0' })
  try {
    await c.connect(t)
    return await c.callTool({ name: 'you-search', arguments: { query: QUERY } })
  } finally { await c.close().catch(()=>{}); await t.close().catch(()=>{}) }
}

const sha = (s: string) => createHash('sha256').update(s).digest('hex').slice(0,16)
const textOf = (r:any) => r.content?.find((b:any)=>b.type==='text')?.text ?? ''
const scOf = (r:any) => r.structuredContent ?? {}
const webOf = (r:any) => JSON.stringify(r.structuredContent?.results?.web ?? [])
const metaOf = (r:any) => r.structuredContent?.metadata ?? {}

const lines: string[] = []
for (let i=0;i<N;i++){
  const t0=Date.now()
  try {
    const r:any = await call()
    const dur=Date.now()-t0
    const txt=textOf(r)
    const web=webOf(r)
    const meta=metaOf(r)
    lines.push(JSON.stringify({
      index:i, iso:new Date().toISOString(), durationMs:dur,
      bytes:Buffer.byteLength(JSON.stringify(r),'utf8'),
      textHash:sha(txt),
      webResultsHash:sha(web),
      webHitCount:(r.structuredContent?.results?.web??[]).length,
      searchUuid:meta.search_uuid ?? null,
      latency:meta.latency ?? null,
      textBytes:Buffer.byteLength(txt,'utf8'),
      webBytes:Buffer.byteLength(web,'utf8'),
    }))
  } catch(e){
    lines.push(JSON.stringify({index:i,iso:new Date().toISOString(),durationMs:Date.now()-t0,error:e instanceof Error?e.message:String(e)}))
  }
  if((i+1)%5===0) console.error(`hash-batch ${i+1}/${N}`)
}
await Bun.write('hash-batch.jsonl', lines.join('\n')+'\n')
console.log(`wrote ${lines.length} records to hash-batch.jsonl`)

results.jsonl

{"index":0,"scheduledOffsetMs":0,"actualOffsetMs":1075,"delayBeforeMs":0,"iso":"2026-09-11T16:18:15.114Z","durationMs":1071,"bytes":62443,"chars":62195,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31680,"structuredContent":30638}}
{"index":1,"scheduledOffsetMs":10145,"actualOffsetMs":10312,"delayBeforeMs":9069,"iso":"2026-09-11T16:18:24.352Z","durationMs":165,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":2,"scheduledOffsetMs":25880,"actualOffsetMs":26077,"delayBeforeMs":15568,"iso":"2026-09-11T16:18:40.117Z","durationMs":194,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":3,"scheduledOffsetMs":40998,"actualOffsetMs":41175,"delayBeforeMs":14921,"iso":"2026-09-11T16:18:55.215Z","durationMs":175,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":4,"scheduledOffsetMs":48299,"actualOffsetMs":48469,"delayBeforeMs":7123,"iso":"2026-09-11T16:19:02.508Z","durationMs":168,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":5,"scheduledOffsetMs":67335,"actualOffsetMs":67514,"delayBeforeMs":18866,"iso":"2026-09-11T16:19:21.554Z","durationMs":178,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":6,"scheduledOffsetMs":81111,"actualOffsetMs":81284,"delayBeforeMs":13596,"iso":"2026-09-11T16:19:35.323Z","durationMs":171,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":7,"scheduledOffsetMs":91159,"actualOffsetMs":91334,"delayBeforeMs":9874,"iso":"2026-09-11T16:19:45.374Z","durationMs":173,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":8,"scheduledOffsetMs":112293,"actualOffsetMs":112467,"delayBeforeMs":20959,"iso":"2026-09-11T16:20:06.507Z","durationMs":172,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":9,"scheduledOffsetMs":122469,"actualOffsetMs":122631,"delayBeforeMs":10001,"iso":"2026-09-11T16:20:16.670Z","durationMs":160,"bytes":62447,"chars":62199,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31682,"structuredContent":30640}}
{"index":10,"scheduledOffsetMs":140407,"actualOffsetMs":140571,"delayBeforeMs":17776,"iso":"2026-09-11T16:20:34.610Z","durationMs":162,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":11,"scheduledOffsetMs":160578,"actualOffsetMs":160735,"delayBeforeMs":20007,"iso":"2026-09-11T16:20:54.775Z","durationMs":155,"bytes":62449,"chars":62201,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31683,"structuredContent":30641}}
{"index":12,"scheduledOffsetMs":178980,"actualOffsetMs":179187,"delayBeforeMs":18245,"iso":"2026-09-11T16:21:13.227Z","durationMs":205,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":13,"scheduledOffsetMs":188100,"actualOffsetMs":188275,"delayBeforeMs":8912,"iso":"2026-09-11T16:21:22.314Z","durationMs":172,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":14,"scheduledOffsetMs":197028,"actualOffsetMs":197205,"delayBeforeMs":8753,"iso":"2026-09-11T16:21:31.245Z","durationMs":175,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":15,"scheduledOffsetMs":219734,"actualOffsetMs":219897,"delayBeforeMs":22527,"iso":"2026-09-11T16:21:53.937Z","durationMs":161,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":16,"scheduledOffsetMs":229395,"actualOffsetMs":229630,"delayBeforeMs":9498,"iso":"2026-09-11T16:22:03.670Z","durationMs":232,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":17,"scheduledOffsetMs":247892,"actualOffsetMs":248271,"delayBeforeMs":18261,"iso":"2026-09-11T16:22:22.311Z","durationMs":378,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":18,"scheduledOffsetMs":255436,"actualOffsetMs":255597,"delayBeforeMs":7164,"iso":"2026-09-11T16:22:29.637Z","durationMs":159,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
{"index":19,"scheduledOffsetMs":274747,"actualOffsetMs":274955,"delayBeforeMs":19150,"iso":"2026-09-11T16:22:48.993Z","durationMs":204,"bytes":62451,"chars":62203,"contentBlocks":1,"isError":false,"error":null,"perField":{"_meta":83,"content":31684,"structuredContent":30642}}
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search-size.ts

/**
 * Calls the You.com MCP `you-search` tool via the TypeScript MCP client SDK
 * v2 (`@modelcontextprotocol/client`) repeatedly and records the size of each
 * tool-call response to a JSONL file.
 *
 * ## Setup
 *
 * ```bash
 * bun install @modelcontextprotocol/client
 * ```
 *
 * ## Run
 *
 * ```bash
 * YDC_API_KEY=your-key-here bun run search-size.ts
 *
 * # Optional overrides
 * YDC_API_URL=https://api-staging.you.com/mcp YDC_API_KEY=... bun run search-size.ts
 * YDC_NUM_QUERIES=100 YDC_WINDOW_MIN=25 YDC_OUT=results.jsonl bun run search-size.ts
 * ```
 *
 * ## What it does
 *
 * Runs `YDC_NUM_QUERIES` (default 100) `you-search` calls spread across a
 * `YDC_WINDOW_MIN`-minute (default 25) window. Each call is placed at a
 * jittered time slot so the gaps between calls vary while the total span stays
 * close to the requested window. For every call one JSON line is appended to
 * `YDC_OUT` (default `results.jsonl`):
 *
 *   { index, scheduledOffsetMs, actualOffsetMs, delayBeforeMs, iso, durationMs,
 *     bytes, chars, contentBlocks, isError, error, perField }
 *
 * `perField` is a UTF-8 JSON byte breakdown of each top-level field of the
 * `CallToolResult` so you can see what contributes to the total.
 *
 * Auth is sent as `Authorization: Bearer <YDC_API_KEY>`, matching the You.com
 * hosted MCP server's API-key auth path. A fresh transport + client is created
 * per call, matching the server's per-request lifecycle.
 */

import { Client, StreamableHTTPClientTransport } from '@modelcontextprotocol/client'
import { appendFile } from 'node:fs/promises'

const SERVER_URL = process.env.YDC_API_URL ?? 'https://api.you.com/mcp'
const API_KEY = process.env.YDC_API_KEY
const NUM_QUERIES = Number(process.env.YDC_NUM_QUERIES ?? 100)
const WINDOW_MIN = Number(process.env.YDC_WINDOW_MIN ?? 25)
const OUT = process.env.YDC_OUT ?? 'results.jsonl'

const QUERY =
  'What is the top story on Hacker News right now? You must use the search tool. Answer with the exact title and URL.'

if (!API_KEY) {
  console.error('Error: YDC_API_KEY env var is required')
  process.exit(1)
}

const byteSize = (v: unknown): number => Buffer.byteLength(JSON.stringify(v), 'utf8')

const sleep = (ms: number): Promise<void> => new Promise((r) => setTimeout(r, ms))

/**
 * Build `n` jittered offsets in [0, windowMs) that sum to ~windowMs and are
 * monotonically increasing. Gaps vary uniformly in [base*0.4, base*1.6].
 */
function buildSchedule(n: number, windowMs: number): number[] {
  const base = windowMs / n
  const raw: number[] = []
  let acc = 0
  for (let i = 0; i < n; i++) {
    const gap = i === 0 ? 0 : base * (0.4 + Math.random() * 1.2)
    acc += gap
    raw.push(acc)
  }
  // Normalize so the last slot lands exactly at windowMs (minus a hair so the
  // final call still has time to complete within the window).
  const scale = (windowMs - base * 0.5) / raw[raw.length - 1]
  return raw.map((t) => Math.round(t * scale))
}

interface CallRecord {
  index: number
  scheduledOffsetMs: number
  actualOffsetMs: number
  delayBeforeMs: number
  iso: string
  durationMs: number
  bytes: number
  chars: number
  contentBlocks: number
  isError: boolean
  error: string | null
  perField: Record<string, number>
}

const runOnce = async (index: number): Promise<CallRecord> => {
  const t0 = Date.now()
  const transport = new StreamableHTTPClientTransport(new URL(SERVER_URL), {
    requestInit: { headers: { Authorization: `Bearer ${API_KEY}` } },
  })
  const client = new Client({ name: 'search-size-script', version: '1.0.0' })
  try {
    await client.connect(transport)
    const result = await client.callTool({ name: 'you-search', arguments: { query: QUERY } })
    const durationMs = Date.now() - t0
    const perField: Record<string, number> = {}
    for (const [key, value] of Object.entries(result)) {
      perField[key] = value === undefined ? 0 : byteSize(value)
    }
    return {
      index,
      scheduledOffsetMs: 0,
      actualOffsetMs: 0,
      delayBeforeMs: 0,
      iso: new Date().toISOString(),
      durationMs,
      bytes: byteSize(result),
      chars: JSON.stringify(result).length,
      contentBlocks: result.content?.length ?? 0,
      isError: result.isError ?? false,
      error: null,
      perField,
    }
  } catch (err) {
    return {
      index,
      scheduledOffsetMs: 0,
      actualOffsetMs: 0,
      delayBeforeMs: 0,
      iso: new Date().toISOString(),
      durationMs: Date.now() - t0,
      bytes: 0,
      chars: 0,
      contentBlocks: 0,
      isError: true,
      error: err instanceof Error ? `${err.name}: ${err.message}` : String(err),
      perField: {},
    }
  } finally {
    await client.close().catch(() => {})
    await transport.close().catch(() => {})
  }
}

const main = async (): Promise<void> => {
  const windowMs = WINDOW_MIN * 60_000
  const schedule = buildSchedule(NUM_QUERIES, windowMs)
  const spanMin = (schedule[schedule.length - 1] / 60_000).toFixed(2)
  console.log(
    `Running ${NUM_QUERIES} queries over ~${spanMin} min (${WINDOW_MIN} min window) -> ${OUT}`,
  )

  const startWall = Date.now()
  let prev = 0
  for (let i = 0; i < NUM_QUERIES; i++) {
    const target = startWall + schedule[i]
    const now = Date.now()
    const delayBeforeMs = Math.max(0, target - now)
    await sleep(delayBeforeMs)

    const rec = await runOnce(i)
    rec.scheduledOffsetMs = schedule[i]
    rec.actualOffsetMs = Date.now() - startWall
    rec.delayBeforeMs = delayBeforeMs

    const line = JSON.stringify(rec)
    await appendFile(OUT, line + '\n', 'utf8')

    const pct = ((i + 1) / NUM_QUERIES * 100).toFixed(0)
    console.log(
      `[${pct.padStart(3)}%] #${(i + 1).toString().padStart(3)}/${NUM_QUERIES} ` +
        `bytes=${rec.bytes} blocks=${rec.contentBlocks} err=${rec.error ?? '-'} ` +
        `(${(rec.actualOffsetMs / 60_000).toFixed(2)}m)`,
    )
    prev = rec.actualOffsetMs
  }
  void prev
  console.log(`Done. Wrote ${NUM_QUERIES} records to ${OUT}`)
}

await main()