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Commit 430f427

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feat(explain): Add support for custom verbosity to the explain plan tool (#573)
1 parent d1d26e6 commit 430f427

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2 files changed

+71
-13
lines changed

2 files changed

+71
-13
lines changed

‎src/tools/mongodb/metadata/explain.ts‎

Lines changed: 12 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,6 @@ import type { ToolArgs, OperationType } from "../../tool.js";
44
import { formatUntrustedData } from "../../tool.js";
55
import { z } from "zod";
66
import type { Document } from "mongodb";
7-
import { ExplainVerbosity } from "mongodb";
87
import { AggregateArgs } from "../read/aggregate.js";
98
import { FindArgs } from "../read/find.js";
109
import { CountArgs } from "../read/count.js";
@@ -34,16 +33,22 @@ export class ExplainTool extends MongoDBToolBase {
3433
])
3534
)
3635
.describe("The method and its arguments to run"),
36+
verbosity: z
37+
.enum(["queryPlanner", "queryPlannerExtended", "executionStats", "allPlansExecution"])
38+
.optional()
39+
.default("queryPlanner")
40+
.describe(
41+
"The verbosity of the explain plan, defaults to queryPlanner. If the user wants to know how fast is a query in execution time, use executionStats. It supports all verbosities as defined in the MongoDB Driver."
42+
),
3743
};
3844

3945
public operationType: OperationType = "metadata";
4046

41-
static readonly defaultVerbosity = ExplainVerbosity.queryPlanner;
42-
4347
protected async execute({
4448
database,
4549
collection,
4650
method: methods,
51+
verbosity,
4752
}: ToolArgs<typeof this.argsShape>): Promise<CallToolResult> {
4853
const provider = await this.ensureConnected();
4954
const method = methods[0];
@@ -66,14 +71,12 @@ export class ExplainTool extends MongoDBToolBase {
6671
writeConcern: undefined,
6772
}
6873
)
69-
.explain(ExplainTool.defaultVerbosity);
74+
.explain(verbosity);
7075
break;
7176
}
7277
case "find": {
7378
const { filter, ...rest } = method.arguments;
74-
result = await provider
75-
.find(database, collection, filter as Document, { ...rest })
76-
.explain(ExplainTool.defaultVerbosity);
79+
result = await provider.find(database, collection, filter as Document, { ...rest }).explain(verbosity);
7780
break;
7881
}
7982
case "count": {
@@ -83,15 +86,15 @@ export class ExplainTool extends MongoDBToolBase {
8386
count: collection,
8487
query,
8588
},
86-
verbosity: ExplainTool.defaultVerbosity,
89+
verbosity,
8790
});
8891
break;
8992
}
9093
}
9194

9295
return {
9396
content: formatUntrustedData(
94-
`Here is some information about the winning plan chosen by the query optimizer for running the given \`${method.name}\` operation in "${database}.${collection}". This information can be used to understand how the query was executed and to optimize the query performance.`,
97+
`Here is some information about the winning plan chosen by the query optimizer for running the given \`${method.name}\` operation in "${database}.${collection}". The execution plan was run with the following verbosity: "${verbosity}". This information can be used to understand how the query was executed and to optimize the query performance.`,
9598
JSON.stringify(result)
9699
),
97100
};

‎tests/integration/tools/mongodb/metadata/explain.test.ts‎

Lines changed: 59 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -21,6 +21,13 @@ describeWithMongoDB("explain tool", (integration) => {
2121
type: "array",
2222
required: true,
2323
},
24+
{
25+
name: "verbosity",
26+
description:
27+
"The verbosity of the explain plan, defaults to queryPlanner. If the user wants to know how fast is a query in execution time, use executionStats. It supports all verbosities as defined in the MongoDB Driver.",
28+
type: "string",
29+
required: false,
30+
},
2431
]
2532
);
2633

@@ -53,7 +60,53 @@ describeWithMongoDB("explain tool", (integration) => {
5360
for (const testType of ["database", "collection"] as const) {
5461
describe(`with non-existing ${testType}`, () => {
5562
for (const testCase of testCases) {
56-
it(`should return the explain plan for ${testCase.method}`, async () => {
63+
it(`should return the explain plan for "queryPlanner" verbosity for ${testCase.method}`, async () => {
64+
if (testType === "database") {
65+
const { databases } = await integration.mongoClient().db("").admin().listDatabases();
66+
expect(databases.find((db) => db.name === integration.randomDbName())).toBeUndefined();
67+
} else if (testType === "collection") {
68+
await integration
69+
.mongoClient()
70+
.db(integration.randomDbName())
71+
.createCollection("some-collection");
72+
73+
const collections = await integration
74+
.mongoClient()
75+
.db(integration.randomDbName())
76+
.listCollections()
77+
.toArray();
78+
79+
expect(collections.find((collection) => collection.name === "coll1")).toBeUndefined();
80+
}
81+
82+
await integration.connectMcpClient();
83+
84+
const response = await integration.mcpClient().callTool({
85+
name: "explain",
86+
arguments: {
87+
database: integration.randomDbName(),
88+
collection: "coll1",
89+
method: [
90+
{
91+
name: testCase.method,
92+
arguments: testCase.arguments,
93+
},
94+
],
95+
},
96+
});
97+
98+
const content = getResponseElements(response.content);
99+
expect(content).toHaveLength(2);
100+
expect(content[0]?.text).toEqual(
101+
`Here is some information about the winning plan chosen by the query optimizer for running the given \`${testCase.method}\` operation in "${integration.randomDbName()}.coll1". The execution plan was run with the following verbosity: "queryPlanner". This information can be used to understand how the query was executed and to optimize the query performance.`
102+
);
103+
104+
expect(content[1]?.text).toContain("queryPlanner");
105+
expect(content[1]?.text).toContain("winningPlan");
106+
expect(content[1]?.text).not.toContain("executionStats");
107+
});
108+
109+
it(`should return the explain plan for "executionStats" verbosity for ${testCase.method}`, async () => {
57110
if (testType === "database") {
58111
const { databases } = await integration.mongoClient().db("").admin().listDatabases();
59112
expect(databases.find((db) => db.name === integration.randomDbName())).toBeUndefined();
@@ -85,17 +138,19 @@ describeWithMongoDB("explain tool", (integration) => {
85138
arguments: testCase.arguments,
86139
},
87140
],
141+
verbosity: "executionStats",
88142
},
89143
});
90144

91145
const content = getResponseElements(response.content);
92146
expect(content).toHaveLength(2);
93147
expect(content[0]?.text).toEqual(
94-
`Here is some information about the winning plan chosen by the query optimizer for running the given \`${testCase.method}\` operation in "${integration.randomDbName()}.coll1". This information can be used to understand how the query was executed and to optimize the query performance.`
148+
`Here is some information about the winning plan chosen by the query optimizer for running the given \`${testCase.method}\` operation in "${integration.randomDbName()}.coll1". The execution plan was run with the following verbosity: "executionStats". This information can be used to understand how the query was executed and to optimize the query performance.`
95149
);
96150

97151
expect(content[1]?.text).toContain("queryPlanner");
98152
expect(content[1]?.text).toContain("winningPlan");
153+
expect(content[1]?.text).toContain("executionStats");
99154
});
100155
}
101156
});
@@ -121,7 +176,7 @@ describeWithMongoDB("explain tool", (integration) => {
121176
});
122177

123178
for (const testCase of testCases) {
124-
it(`should return the explain plan for ${testCase.method}`, async () => {
179+
it(`should return the explain plan with verbosity "queryPlanner" for ${testCase.method}`, async () => {
125180
await integration.connectMcpClient();
126181

127182
const response = await integration.mcpClient().callTool({
@@ -141,7 +196,7 @@ describeWithMongoDB("explain tool", (integration) => {
141196
const content = getResponseElements(response.content);
142197
expect(content).toHaveLength(2);
143198
expect(content[0]?.text).toEqual(
144-
`Here is some information about the winning plan chosen by the query optimizer for running the given \`${testCase.method}\` operation in "${integration.randomDbName()}.people". This information can be used to understand how the query was executed and to optimize the query performance.`
199+
`Here is some information about the winning plan chosen by the query optimizer for running the given \`${testCase.method}\` operation in "${integration.randomDbName()}.people". The execution plan was run with the following verbosity: "queryPlanner". This information can be used to understand how the query was executed and to optimize the query performance.`
145200
);
146201

147202
expect(content[1]?.text).toContain("queryPlanner");

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