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[MCP] Add mcp tools to explore databases' built context #86

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Merged
gasparian merged 6 commits into from
Mar 31, 2026
Merged

[MCP] Add mcp tools to explore databases' built context #86

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723d690
Refact: Use ProjectLayout directly in the McpContext
JulienArzul Mar 30, 2026
6ef5a51
Add MCP tools to explore context generated for a database in the Data…
JulienArzul Mar 30, 2026
c3170c8
Do not show the banner asking to upgrade the FastMCP version when run…
JulienArzul Mar 30, 2026
ef8532f
Remove mentions of running SQL from the tools' descriptions since it …
JulienArzul Mar 30, 2026
18705db
Update end2end expected output contexts
JulienArzul Mar 31, 2026
1615b35
Upgrade databao-context-engine to a stable version
JulienArzul Mar 31, 2026
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383 changes: 0 additions & 383 deletions e2e-tests/tests/resources/bigquery_introspections.yaml
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@JulienArzul JulienArzul Mar 31, 2026

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There was some changes in DCE, where the YAML output doesn't write null values anymore and samples are always formatted as a string (that gets truncated)

=> those test files reflect those changes

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148 changes: 6 additions & 142 deletions e2e-tests/tests/resources/duckdb_introspections.yaml
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
# ===== test_duckdb_conn.yaml =====
datasource_id: test_duckdb_conn.yaml
datasource_type: duckdb
context_built_at: 2026-02-27 16:38:36.999625
context:
catalogs:
- name: test_db
Expand All @@ -13,206 +12,90 @@ context:
- name: id
type: INTEGER
nullable: false
description: null
default_expression: null
generated: null
checks: []
- name: tinyint_col
type: TINYINT
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: smallint_col
type: SMALLINT
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: int_col
type: INTEGER
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: bigint_col
type: BIGINT
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: hugeint_col
type: HUGEINT
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: utinyint_col
type: UTINYINT
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: usmallint_col
type: USMALLINT
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: uinteger_col
type: UINTEGER
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: ubigint_col
type: UBIGINT
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: real_col
type: FLOAT
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: double_col
type: DOUBLE
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: decimal_col
type: DECIMAL(10,2)
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: boolean_col
type: BOOLEAN
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: char_col
type: VARCHAR
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: varchar_col
type: VARCHAR
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: text_col
type: VARCHAR
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: blob_col
type: BLOB
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: date_col
type: DATE
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: time_col
type: TIME
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: timestamp_col
type: TIMESTAMP
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: timestamptz_col
type: TIMESTAMP WITH TIME ZONE
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: interval_col
type: INTERVAL
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: uuid_col
type: UUID
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: json_col
type: JSON
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: int_array_col
type: INTEGER[]
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: varchar_array_col
type: VARCHAR[]
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: struct_col
type: STRUCT("name" VARCHAR, age INTEGER)
nullable: true
description: null
default_expression: null
generated: null
checks: []
- name: map_col
type: MAP(VARCHAR, INTEGER)
nullable: true
description: null
default_expression: null
generated: null
checks: []
samples:
- id: 1
tinyint_col: 10
Expand All @@ -231,40 +114,21 @@ context:
char_col: ABCDE
varchar_col: Hello DuckDB
text_col: This is a text column
blob_col: !!binary |
REVBREJFRUY=
blob_col: <bytes, 8 bytes>
date_col: 2025-01-01
time_col: '12:30:00'
timestamp_col: 2025-01-01 12:30:00
timestamptz_col: 2025-01-01 11:30:00+01:00
timestamptz_col: 2025-01-01 10:30:00+00:00
interval_col: 2 days, 0:00:00
uuid_col: 550e8400-e29b-41d4-a716-446655440000
json_col: '{"key": "value"}'
int_array_col:
- 1
- 2
- 3
varchar_array_col:
- a
- b
- c
struct_col:
name: Alice
age: 30
map_col:
a: 1
b: 2
partition_info: null
description: null
int_array_col: '[1, 2, 3]'
varchar_array_col: '["a", "b", "c"]'
struct_col: '{"name": "Alice", "age": 30}'
map_col: '{"a": 1, "b": 2}'
kind: table
primary_key:
name: all_types_demo_id_pkey
columns:
- id
validated: true
unique_constraints: []
checks: []
indexes: []
foreign_keys: []
description: null
description: null
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