Q (haiku): How many patients and samples are in the MSK-CHORD Study?

▶ list_studies
{
 "search": "MSK CHORD",
 "limit": "5"
}

✗ error
<tool_use_error>Error: No such tool available: mcp__navigator__list_studies</tool_use_error>

▶ list_studies
{
 "search": "MSK CHORD",
 "limit": 5
}

◀ result
{"result":[{"cancer_study_identifier":"msk_chord_2024","name":"MSK-CHORD (MSK, Nature 2024)","type_of_cancer_id":"mixed","sample_count":25040,"has_guide":true,"url":"https://www.cbioportal.org/study/summary?id=msk_chord_2024"}]}

▶ clickhouse_run_select_query
{
 "query": "
SELECT 
  COUNT(DISTINCT patient_id) as num_patients,
  COUNT(DISTINCT sample_id) as num_samples
FROM sample
WHERE cancer_study_identifier = 'msk_chord_2024'
"
}

◀ result
{"error_message":"Query execution failed: HTTPDriver for https://dl96orhu96.us-east-1.aws.clickhouse.cloud:8443 received ClickHouse error code 47\n Code: 47. DB::Exception: Unknown expression or function identifier `sample_id` in scope SELECT COUNTDistinct(patient_id) AS num_patients, COUNTDistinct(sample_id) AS num_samples FROM sample WHERE cancer_study_identifier = 'msk_chord_2024'. Maybe you meant: ['stable_id']. (UNKNOWN_IDENTIFIER) (version 26.4.1.2359 (official build))\n"}

▶ clickhouse_list_table_columns
{
 "table": "sample"
}

◀ result
{"columns":[{"name":"internal_id","type":"Int64","comment":"Primary key. Unique internal identifier for the sample."},{"name":"stable_id","type":"String","comment":"Stable identifier for the sample within the study. Combined with cancer_study_identifier forms sample_unique_id."},{"name":"patient_id","type":"Int64","comment":"Foreign key to patient.internal_id. Links sample to its patient."}]}

▶ clickhouse_run_select_query
{
 "query": "
SELECT 
  COUNT(DISTINCT patient_id) as num_patients,
  COUNT(DISTINCT stable_id) as num_samples
FROM sample
WHERE cancer_study_identifier = 'msk_chord_2024'
"
}

◀ result
{"error_message":"Query execution failed: HTTPDriver for https://dl96orhu96.us-east-1.aws.clickhouse.cloud:8443 received ClickHouse error code 47\n Code: 47. DB::Exception: Unknown expression or function identifier `cancer_study_identifier` in scope SELECT COUNTDistinct(patient_id) AS num_patients, COUNTDistinct(stable_id) AS num_samples FROM sample WHERE cancer_study_identifier = 'msk_chord_2024'. (UNKNOWN_IDENTIFIER) (version 26.4.1.2359 (official build))\n"}

▶ clickhouse_list_table_columns
{
 "table": "sample"
}

◀ result
{"columns":[{"name":"internal_id","type":"Int64","comment":"Primary key. Unique internal identifier for the sample."},{"name":"stable_id","type":"String","comment":"Stable identifier for the sample within the study. Combined with cancer_study_identifier forms sample_unique_id."},{"name":"patient_id","type":"Int64","comment":"Foreign key to patient.internal_id. Links sample to its patient."}]}

▶ clickhouse_list_table_columns
{
 "table": "patient"
}

◀ result
{"columns":[{"name":"internal_id","type":"Int64","comment":"Primary key. Unique internal identifier for the patient."},{"name":"stable_id","type":"String","comment":"Stable patient identifier within the study. Combined with cancer_study_identifier forms patient_unique_id."},{"name":"cancer_study_id","type":"Int64","comment":"Foreign key to cancer_study.cancer_study_id. Links patient to their study."}]}

▶ clickhouse_run_select_query
{
 "query": "
SELECT 
  COUNT(DISTINCT p.internal_id) as num_patients,
  COUNT(DISTINCT s.internal_id) as num_samples
FROM sample s
INNER JOIN patient p ON s.patient_id = p.internal_id
INNER JOIN cancer_study cs ON p.cancer_study_id = cs.cancer_study_id
WHERE cs.cancer_study_identifier = 'msk_chord_2024'
"
}

◀ result
{"rows":[{"num_patients":24950,"num_samples":25040}]}

═ answer (success)
## MSK-CHORD Study Cohort Size

The **MSK-CHORD (MSK, Nature 2024)** study contains:

- **24,950 patients**
- **25,040 samples**

This is a large mixed-cancer cohort published in Nature in 2024. You can explore the full study here: [MSK-CHORD Study](https://www.cbioportal.org/study/summary?id=msk_chord_2024)