chore: import upstream snapshot with attribution

internal/tools/cloudsqlpg/vectorassistimprovequeryrecall/vectorassistimprovequeryrecall.go

@@ -0,0 +1,196 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package vectorassistimprovequeryrecall
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/googleapis/mcp-toolbox/internal/tools"
+	"github.com/googleapis/mcp-toolbox/internal/util"
+	"github.com/googleapis/mcp-toolbox/internal/util/parameters"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+const resourceType string = "vector-assist-improve-query-recall"
+
+// Query to check if the index exists and if it is an HNSW index.
+const checkIndexQuery = `
+	SELECT 
+		(COUNT(1) > 0) AS index_present,
+		COALESCE(BOOL_OR(indexdef ILIKE '%USING hnsw%'), false) AS is_hnsw
+	FROM pg_indexes 
+	WHERE schemaname = @schema_name::TEXT
+		AND tablename = @table_name::TEXT
+		AND indexname = @index_name::TEXT
+		AND indexdef ILIKE '%' || @vector_column_name::TEXT || '%';
+`
+
+// Query to find the optimal index parameters
+const improveRecallQuery = `
+  SELECT output_ef_search AS ef_search
+  FROM vector_assist.find_ef_search_for_target_recall(
+    table_name => @table_name::TEXT,
+    schema_name => @schema_name::TEXT,
+    column_name => @vector_column_name::TEXT,
+    top_k => @top_k::INT,
+    target_recall => @target_recall::FLOAT,
+    distance_func => @distance_func::TEXT
+  );
+`
+
+func init() {
+	if !tools.Register(resourceType, newConfig) {
+		panic(fmt.Sprintf("tool type %q already registered", resourceType))
+	}
+}
+
+func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
+	actual := Config{ConfigBase: tools.ConfigBase{Name: name}}
+	if err := decoder.DecodeContext(ctx, &actual); err != nil {
+		return nil, err
+	}
+	return actual, nil
+}
+
+type compatibleSource interface {
+	PostgresPool() *pgxpool.Pool
+	RunSQL(context.Context, string, []any) (any, error)
+}
+
+type Config struct {
+	tools.ConfigBase `yaml:",inline"`
+	Type             string                 `yaml:"type" validate:"required"`
+	Source           string                 `yaml:"source" validate:"required"`
+	Annotations      *tools.ToolAnnotations `yaml:"annotations,omitempty"`
+}
+
+var _ tools.ToolConfig = Config{}
+
+func (cfg Config) ToolConfigType() string {
+	return resourceType
+}
+
+func (cfg Config) Initialize(context.Context) (tools.Tool, error) {
+	allParameters := parameters.Parameters{
+		parameters.NewStringParameter("schema_name", "Optional parameter: Schema name of the table.", parameters.WithStringDefault("public")),
+		parameters.NewStringParameter("table_name", "Table name experiencing degraded vector search recall.", parameters.WithStringRequired(true)),
+		parameters.NewStringParameter("vector_column_name", "Column name containing the vector embeddings.", parameters.WithStringRequired(true)),
+		parameters.NewStringParameter("index_name", "Name of the vector index to tune.", parameters.WithStringRequired(true)),
+		parameters.NewIntParameter("top_k", "Optional parameter: Top k value for the vector search.", parameters.WithIntDefault(10)),
+		parameters.NewFloatParameter("target_recall", "Optional parameter: Target recall value for search results.", parameters.WithFloatDefault(0.95)),
+		parameters.NewStringParameter("distance_func", "Optional parameter: Distance function used for the vector search similarity.", parameters.WithStringDefault("cosine")),
+	}
+	paramManifest := allParameters.Manifest()
+
+	if cfg.Description == "" {
+		cfg.Description = "Use this tool to troubleshoot and optimize existing vector search workloads when a user reports irrelevant results, poor accuracy, or degraded recall. It determines the optimal tuning parameter (such as ef_search) for an active vector index to improve the search results. The tool outputs an actionable SQL query recommendation to be executed as a next action using the 'execute_sql' tool."
+	}
+
+	return Tool{
+		BaseTool: tools.NewBaseTool(
+			cfg,
+			tools.GetAnnotationsOrDefault(cfg.Annotations, tools.NewDestructiveAnnotations),
+			tools.Manifest{Description: cfg.Description, Parameters: paramManifest, AuthRequired: cfg.AuthRequired},
+			allParameters,
+		),
+	}, nil
+}
+
+var _ tools.Tool = Tool{}
+
+type Tool struct {
+	tools.BaseTool[Config]
+}
+
+func (t Tool) ToConfig() tools.ToolConfig {
+	return t.Cfg
+}
+
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
+	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Cfg.Source, t.Cfg.Name, t.Cfg.Type)
+	if err != nil {
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
+	}
+	paramsMap := params.AsMap()
+
+	namedArgs := pgx.NamedArgs{}
+	for key, value := range paramsMap {
+		namedArgs[key] = value
+	}
+
+	// Check if the index exists and if it is an HNSW index.
+	checkResp, err := source.RunSQL(ctx, checkIndexQuery, []any{namedArgs})
+	if err != nil {
+		return nil, util.ProcessGeneralError(err)
+	}
+
+	checkBytes, marshalErr := json.Marshal(checkResp)
+	if marshalErr != nil {
+		return nil, util.NewClientServerError("failed to process index check response", http.StatusInternalServerError, marshalErr)
+	}
+
+	var checkRows []map[string]interface{}
+	if unmarshalErr := json.Unmarshal(checkBytes, &checkRows); unmarshalErr != nil || len(checkRows) == 0 {
+		return nil, util.NewClientServerError("unexpected empty response from database", http.StatusInternalServerError, unmarshalErr)
+	}
+
+	row := checkRows[0]
+	indexPresent, ok := row["index_present"].(bool)
+	if !ok {
+		// If the key is missing or isn't a boolean, it's likely a server-side/query issue.
+		return nil, util.NewClientServerError("Internal error: 'index_present' is missing or has an invalid type.", http.StatusInternalServerError, nil)
+	}
+	if !indexPresent {
+		return nil, util.NewClientServerError("Index not found for the given table and vector column. If the table lacks an existing vector setup, use the 'define_spec' tool to configure the database.", http.StatusBadRequest, nil)
+	}
+
+	isHnsw, ok := row["is_hnsw"].(bool)
+	if !ok {
+		return nil, util.NewClientServerError("Internal error: 'is_hnsw' is missing or has an invalid type.", http.StatusInternalServerError, nil)
+	}
+	if !isHnsw {
+		return nil, util.NewClientServerError("Unsupported index type for recall optimization. Only HNSW index is supported.", http.StatusBadRequest, nil)
+	}
+
+	// Calculate the optimal index parameters to achieve the target recall.
+	tuningResp, err := source.RunSQL(ctx, improveRecallQuery, []any{namedArgs})
+	if err != nil {
+		return nil, util.ProcessGeneralError(err)
+	}
+
+	tuningBytes, marshalErr := json.Marshal(tuningResp)
+	if marshalErr != nil {
+		return nil, util.NewClientServerError("failed to process tuning response", http.StatusInternalServerError, marshalErr)
+	}
+
+	var tuningRows []map[string]interface{}
+	if unmarshalErr := json.Unmarshal(tuningBytes, &tuningRows); unmarshalErr != nil || len(tuningRows) == 0 {
+		return nil, util.NewClientServerError("unexpected empty tuning response from database", http.StatusInternalServerError, unmarshalErr)
+	}
+
+	// Extract ef_search (JSON decoder defaults numbers to float64)
+	efSearchVal, ok := tuningRows[0]["ef_search"].(float64)
+	if !ok {
+		return nil, util.NewClientServerError("Failed to calculate appropriate efSearch value", http.StatusInternalServerError, nil)
+	}
+
+	queryRecommendation := fmt.Sprintf("SET hnsw.ef_search = %d;", int(efSearchVal))
+	return queryRecommendation, nil
+}

internal/tools/cloudsqlpg/vectorassistimprovequeryrecall/vectorassistimprovequeryrecall_test.go

@@ -0,0 +1,70 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package vectorassistimprovequeryrecall_test
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/mcp-toolbox/internal/server"
+	"github.com/googleapis/mcp-toolbox/internal/testutils"
+	"github.com/googleapis/mcp-toolbox/internal/tools"
+	"github.com/googleapis/mcp-toolbox/internal/tools/cloudsqlpg/vectorassistimprovequeryrecall"
+)
+
+func TestParseFromYaml(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		want server.ToolConfigs
+	}{
+		{
+			desc: "basic example",
+			in: `
+      kind: tool
+      name: improve-query-recall-tool
+      type: vector-assist-improve-query-recall
+      description: a test description
+      source: a-source
+      `,
+			want: server.ToolConfigs{
+				"improve-query-recall-tool": vectorassistimprovequeryrecall.Config{
+					ConfigBase: tools.ConfigBase{
+						Name:         "improve-query-recall-tool",
+						Description:  "a test description",
+						AuthRequired: []string{},
+					},
+					Type:   "vector-assist-improve-query-recall",
+					Source: "a-source",
+				},
+			},
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			_, _, _, got, _, _, err := server.UnmarshalResourceConfig(ctx, testutils.FormatYaml(tc.in))
+			if err != nil {
+				t.Fatalf("unable to unmarshal: %s", err)
+			}
+			if diff := cmp.Diff(tc.want, got); diff != "" {
+				t.Fatalf("incorrect parse: diff %v", diff)
+			}
+		})
+	}
+}