feat(embeddings): add embedding model support and related changes

* Introduced EmbeddingModel method in Client and Provider interfaces
* Updated InsertThought and SearchThoughts methods to handle embedding models
* Created embeddings table and updated match_thoughts function for model filtering
* Removed embedding column from thoughts table
* Adjusted permissions for new embeddings table

internal/ai/compat/client.go

@@ -208,6 +208,10 @@ func (c *Client) Name() string {
 	return c.name
 }
 
+func (c *Client) EmbeddingModel() string {
+	return c.embeddingModel
+}
+
 func (c *Client) doJSON(ctx context.Context, path string, requestBody any, dest any) error {
 	body, err := json.Marshal(requestBody)
 	if err != nil {

internal/ai/provider.go

@@ -11,4 +11,5 @@ type Provider interface {
 	ExtractMetadata(ctx context.Context, input string) (thoughttypes.ThoughtMetadata, error)
 	Summarize(ctx context.Context, systemPrompt, userPrompt string) (string, error)
 	Name() string
+	EmbeddingModel() string
 }

internal/app/app.go

@@ -40,7 +40,7 @@ func Run(ctx context.Context, configPath string) error {
 	}
 	defer db.Close()
 
-	if err := db.VerifyRequirements(ctx, cfg.AI.Embeddings.Dimensions); err != nil {
+	if err := db.VerifyRequirements(ctx); err != nil {
 		return err
 	}
 

internal/mcpserver/schema.go

@@ -0,0 +1,47 @@
+package mcpserver
+
+import (
+	"context"
+	"fmt"
+	"reflect"
+
+	"github.com/google/jsonschema-go/jsonschema"
+	"github.com/google/uuid"
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+)
+
+var toolSchemaOptions = &jsonschema.ForOptions{
+	TypeSchemas: map[reflect.Type]*jsonschema.Schema{
+		reflect.TypeFor[uuid.UUID](): {
+			Type:   "string",
+			Format: "uuid",
+		},
+	},
+}
+
+func addTool[In any, Out any](server *mcp.Server, tool *mcp.Tool, handler func(context.Context, *mcp.CallToolRequest, In) (*mcp.CallToolResult, Out, error)) {
+	if err := setToolSchemas[In, Out](tool); err != nil {
+		panic(fmt.Sprintf("configure MCP tool %q schemas: %v", tool.Name, err))
+	}
+	mcp.AddTool(server, tool, handler)
+}
+
+func setToolSchemas[In any, Out any](tool *mcp.Tool) error {
+	if tool.InputSchema == nil {
+		inputSchema, err := jsonschema.For[In](toolSchemaOptions)
+		if err != nil {
+			return fmt.Errorf("infer input schema: %w", err)
+		}
+		tool.InputSchema = inputSchema
+	}
+
+	if tool.OutputSchema == nil {
+		outputSchema, err := jsonschema.For[Out](toolSchemaOptions)
+		if err != nil {
+			return fmt.Errorf("infer output schema: %w", err)
+		}
+		tool.OutputSchema = outputSchema
+	}
+
+	return nil
+}

internal/mcpserver/schema_test.go

@@ -0,0 +1,42 @@
+package mcpserver
+
+import (
+	"testing"
+
+	"github.com/google/jsonschema-go/jsonschema"
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+
+	"git.warky.dev/wdevs/amcs/internal/tools"
+)
+
+func TestSetToolSchemasUsesStringUUIDsInListOutput(t *testing.T) {
+	tool := &mcp.Tool{Name: "list_thoughts"}
+
+	if err := setToolSchemas[tools.ListInput, tools.ListOutput](tool); err != nil {
+		t.Fatalf("set tool schemas: %v", err)
+	}
+
+	schema, ok := tool.OutputSchema.(*jsonschema.Schema)
+	if !ok {
+		t.Fatalf("output schema type = %T, want *jsonschema.Schema", tool.OutputSchema)
+	}
+
+	thoughtsSchema := schema.Properties["thoughts"]
+	if thoughtsSchema == nil {
+		t.Fatal("missing thoughts schema")
+	}
+	if thoughtsSchema.Items == nil {
+		t.Fatal("missing thoughts item schema")
+	}
+
+	idSchema := thoughtsSchema.Items.Properties["id"]
+	if idSchema == nil {
+		t.Fatal("missing id schema")
+	}
+	if idSchema.Type != "string" {
+		t.Fatalf("id schema type = %q, want %q", idSchema.Type, "string")
+	}
+	if idSchema.Format != "uuid" {
+		t.Fatalf("id schema format = %q, want %q", idSchema.Format, "uuid")
+	}
+}

internal/mcpserver/server.go

@@ -32,87 +32,87 @@ func New(cfg config.MCPConfig, toolSet ToolSet) http.Handler {
 		Version: cfg.Version,
 	}, nil)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "capture_thought",
 		Description: "Store a thought with generated embeddings and extracted metadata.",
 	}, toolSet.Capture.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "search_thoughts",
 		Description: "Search stored thoughts by semantic similarity.",
 	}, toolSet.Search.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "list_thoughts",
 		Description: "List recent thoughts with optional metadata filters.",
 	}, toolSet.List.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "thought_stats",
 		Description: "Get counts and top metadata buckets across stored thoughts.",
 	}, toolSet.Stats.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "get_thought",
 		Description: "Retrieve a full thought by id.",
 	}, toolSet.Get.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "update_thought",
 		Description: "Update thought content or merge metadata.",
 	}, toolSet.Update.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "delete_thought",
 		Description: "Hard-delete a thought by id.",
 	}, toolSet.Delete.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "archive_thought",
 		Description: "Archive a thought so it is hidden from default search and listing.",
 	}, toolSet.Archive.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "create_project",
 		Description: "Create a named project container for thoughts.",
 	}, toolSet.Projects.Create)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "list_projects",
 		Description: "List projects and their current thought counts.",
 	}, toolSet.Projects.List)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "set_active_project",
 		Description: "Set the active project for the current MCP session.",
 	}, toolSet.Projects.SetActive)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "get_active_project",
 		Description: "Return the active project for the current MCP session.",
 	}, toolSet.Projects.GetActive)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "get_project_context",
 		Description: "Get recent and semantic context for a project.",
 	}, toolSet.Context.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "recall_context",
 		Description: "Recall semantically relevant and recent context.",
 	}, toolSet.Recall.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "summarize_thoughts",
 		Description: "Summarize a filtered or searched set of thoughts.",
 	}, toolSet.Summarize.Handle)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "link_thoughts",
 		Description: "Create a typed relationship between two thoughts.",
 	}, toolSet.Links.Link)
 
-	mcp.AddTool(server, &mcp.Tool{
+	addTool(server, &mcp.Tool{
 		Name:        "related_thoughts",
 		Description: "Retrieve explicit links and semantic neighbors for a thought.",
 	}, toolSet.Links.Related)

internal/store/db.go

@@ -3,7 +3,6 @@ package store
 import (
 	"context"
 	"fmt"
-	"regexp"
 	"time"
 
 	"github.com/jackc/pgx/v5"
@@ -68,7 +67,7 @@ func (db *DB) Ready(ctx context.Context) error {
 	return db.Ping(readyCtx)
 }
 
-func (db *DB) VerifyRequirements(ctx context.Context, dimensions int) error {
+func (db *DB) VerifyRequirements(ctx context.Context) error {
 	var hasVector bool
 	if err := db.pool.QueryRow(ctx, `select exists(select 1 from pg_extension where extname = 'vector')`).Scan(&hasVector); err != nil {
 		return fmt.Errorf("verify vector extension: %w", err)
@@ -85,33 +84,12 @@ func (db *DB) VerifyRequirements(ctx context.Context, dimensions int) error {
 		return fmt.Errorf("match_thoughts function is missing")
 	}
 
-	var embeddingType string
+	var hasEmbeddings bool
-	err := db.pool.QueryRow(ctx, `
+	if err := db.pool.QueryRow(ctx, `select exists(select 1 from pg_tables where schemaname = 'public' and tablename = 'embeddings')`).Scan(&hasEmbeddings); err != nil {
-		select format_type(a.atttypid, a.atttypmod)
+		return fmt.Errorf("verify embeddings table: %w", err)
-		from pg_attribute a
-		join pg_class c on c.oid = a.attrelid
-		join pg_namespace n on n.oid = c.relnamespace
-		where n.nspname = 'public'
-		  and c.relname = 'thoughts'
-		  and a.attname = 'embedding'
-		  and not a.attisdropped
-	`).Scan(&embeddingType)
-	if err != nil {
-		return fmt.Errorf("verify thoughts.embedding type: %w", err)
 	}
-
+	if !hasEmbeddings {
-	re := regexp.MustCompile(`vector\((\d+)\)`)
+		return fmt.Errorf("embeddings table is missing — run migrations")
-	matches := re.FindStringSubmatch(embeddingType)
-	if len(matches) != 2 {
-		return fmt.Errorf("unexpected embedding type %q", embeddingType)
-	}
-
-	var actualDimensions int
-	if _, err := fmt.Sscanf(matches[1], "%d", &actualDimensions); err != nil {
-		return fmt.Errorf("parse embedding dimensions from %q: %w", embeddingType, err)
-	}
-	if actualDimensions != dimensions {
-		return fmt.Errorf("embedding dimension mismatch: config=%d db=%d", dimensions, actualDimensions)
 	}
 
 	return nil

internal/store/thoughts.go

@@ -15,27 +15,51 @@ import (
 	thoughttypes "git.warky.dev/wdevs/amcs/internal/types"
 )
 
-func (db *DB) InsertThought(ctx context.Context, thought thoughttypes.Thought) (thoughttypes.Thought, error) {
+func (db *DB) InsertThought(ctx context.Context, thought thoughttypes.Thought, embeddingModel string) (thoughttypes.Thought, error) {
 	metadata, err := json.Marshal(thought.Metadata)
 	if err != nil {
 		return thoughttypes.Thought{}, fmt.Errorf("marshal metadata: %w", err)
 	}
 
-	row := db.pool.QueryRow(ctx, `
+	tx, err := db.pool.Begin(ctx)
-		insert into thoughts (content, embedding, metadata, project_id)
+	if err != nil {
-		values ($1, $2, $3::jsonb, $4)
+		return thoughttypes.Thought{}, fmt.Errorf("begin transaction: %w", err)
+	}
+	defer tx.Rollback(ctx)
+
+	row := tx.QueryRow(ctx, `
+		insert into thoughts (content, metadata, project_id)
+		values ($1, $2::jsonb, $3)
 		returning id, created_at, updated_at
-	`, thought.Content, pgvector.NewVector(thought.Embedding), metadata, thought.ProjectID)
+	`, thought.Content, metadata, thought.ProjectID)
 
 	created := thought
+	created.Embedding = nil
 	if err := row.Scan(&created.ID, &created.CreatedAt, &created.UpdatedAt); err != nil {
 		return thoughttypes.Thought{}, fmt.Errorf("insert thought: %w", err)
 	}
 
+	if len(thought.Embedding) > 0 && embeddingModel != "" {
+		if _, err := tx.Exec(ctx, `
+			insert into embeddings (thought_id, model, dim, embedding)
+			values ($1, $2, $3, $4)
+			on conflict (thought_id, model) do update
+				set embedding = excluded.embedding,
+				    dim = excluded.dim,
+				    updated_at = now()
+		`, created.ID, embeddingModel, len(thought.Embedding), pgvector.NewVector(thought.Embedding)); err != nil {
+			return thoughttypes.Thought{}, fmt.Errorf("insert embedding: %w", err)
+		}
+	}
+
+	if err := tx.Commit(ctx); err != nil {
+		return thoughttypes.Thought{}, fmt.Errorf("commit thought insert: %w", err)
+	}
+
 	return created, nil
 }
 
-func (db *DB) SearchThoughts(ctx context.Context, embedding []float32, threshold float64, limit int, filter map[string]any) ([]thoughttypes.SearchResult, error) {
+func (db *DB) SearchThoughts(ctx context.Context, embedding []float32, embeddingModel string, threshold float64, limit int, filter map[string]any) ([]thoughttypes.SearchResult, error) {
 	filterJSON, err := json.Marshal(filter)
 	if err != nil {
 		return nil, fmt.Errorf("marshal search filter: %w", err)
@@ -43,8 +67,8 @@ func (db *DB) SearchThoughts(ctx context.Context, embedding []float32, threshold
 
 	rows, err := db.pool.Query(ctx, `
 		select id, content, metadata, similarity, created_at
-		from match_thoughts($1, $2, $3, $4::jsonb)
+		from match_thoughts($1, $2, $3, $4::jsonb, $5)
-	`, pgvector.NewVector(embedding), threshold, limit, filterJSON)
+	`, pgvector.NewVector(embedding), threshold, limit, filterJSON, embeddingModel)
 	if err != nil {
 		return nil, fmt.Errorf("search thoughts: %w", err)
 	}
@@ -185,15 +209,14 @@ func (db *DB) Stats(ctx context.Context) (thoughttypes.ThoughtStats, error) {
 
 func (db *DB) GetThought(ctx context.Context, id uuid.UUID) (thoughttypes.Thought, error) {
 	row := db.pool.QueryRow(ctx, `
-		select id, content, embedding, metadata, project_id, archived_at, created_at, updated_at
+		select id, content, metadata, project_id, archived_at, created_at, updated_at
 		from thoughts
 		where id = $1
 	`, id)
 
 	var thought thoughttypes.Thought
-	var embedding pgvector.Vector
 	var metadataBytes []byte
-	if err := row.Scan(&thought.ID, &thought.Content, &embedding, &metadataBytes, &thought.ProjectID, &thought.ArchivedAt, &thought.CreatedAt, &thought.UpdatedAt); err != nil {
+	if err := row.Scan(&thought.ID, &thought.Content, &metadataBytes, &thought.ProjectID, &thought.ArchivedAt, &thought.CreatedAt, &thought.UpdatedAt); err != nil {
 		if err == pgx.ErrNoRows {
 			return thoughttypes.Thought{}, err
 		}
@@ -203,26 +226,30 @@ func (db *DB) GetThought(ctx context.Context, id uuid.UUID) (thoughttypes.Though
 	if err := json.Unmarshal(metadataBytes, &thought.Metadata); err != nil {
 		return thoughttypes.Thought{}, fmt.Errorf("decode thought metadata: %w", err)
 	}
-	thought.Embedding = embedding.Slice()
 
 	return thought, nil
 }
 
-func (db *DB) UpdateThought(ctx context.Context, id uuid.UUID, content string, embedding []float32, metadata thoughttypes.ThoughtMetadata, projectID *uuid.UUID) (thoughttypes.Thought, error) {
+func (db *DB) UpdateThought(ctx context.Context, id uuid.UUID, content string, embedding []float32, embeddingModel string, metadata thoughttypes.ThoughtMetadata, projectID *uuid.UUID) (thoughttypes.Thought, error) {
 	metadataBytes, err := json.Marshal(metadata)
 	if err != nil {
 		return thoughttypes.Thought{}, fmt.Errorf("marshal updated metadata: %w", err)
 	}
 
-	tag, err := db.pool.Exec(ctx, `
+	tx, err := db.pool.Begin(ctx)
+	if err != nil {
+		return thoughttypes.Thought{}, fmt.Errorf("begin transaction: %w", err)
+	}
+	defer tx.Rollback(ctx)
+
+	tag, err := tx.Exec(ctx, `
 		update thoughts
 		set content    = $2,
-		    embedding = $3,
+		    metadata   = $3::jsonb,
-		    metadata = $4::jsonb,
+		    project_id = $4,
-		    project_id = $5,
 		    updated_at = now()
 		where id = $1
-	`, id, content, pgvector.NewVector(embedding), metadataBytes, projectID)
+	`, id, content, metadataBytes, projectID)
 	if err != nil {
 		return thoughttypes.Thought{}, fmt.Errorf("update thought: %w", err)
 	}
@@ -230,6 +257,23 @@ func (db *DB) UpdateThought(ctx context.Context, id uuid.UUID, content string, e
 		return thoughttypes.Thought{}, pgx.ErrNoRows
 	}
 
+	if len(embedding) > 0 && embeddingModel != "" {
+		if _, err := tx.Exec(ctx, `
+			insert into embeddings (thought_id, model, dim, embedding)
+			values ($1, $2, $3, $4)
+			on conflict (thought_id, model) do update
+				set embedding = excluded.embedding,
+				    dim = excluded.dim,
+				    updated_at = now()
+		`, id, embeddingModel, len(embedding), pgvector.NewVector(embedding)); err != nil {
+			return thoughttypes.Thought{}, fmt.Errorf("upsert embedding: %w", err)
+		}
+	}
+
+	if err := tx.Commit(ctx); err != nil {
+		return thoughttypes.Thought{}, fmt.Errorf("commit thought update: %w", err)
+	}
+
 	return db.GetThought(ctx, id)
 }
 
@@ -265,27 +309,29 @@ func (db *DB) RecentThoughts(ctx context.Context, projectID *uuid.UUID, limit in
 	return db.ListThoughts(ctx, filter)
 }
 
-func (db *DB) SearchSimilarThoughts(ctx context.Context, embedding []float32, threshold float64, limit int, projectID *uuid.UUID, excludeID *uuid.UUID) ([]thoughttypes.SearchResult, error) {
+func (db *DB) SearchSimilarThoughts(ctx context.Context, embedding []float32, embeddingModel string, threshold float64, limit int, projectID *uuid.UUID, excludeID *uuid.UUID) ([]thoughttypes.SearchResult, error) {
-	args := []any{pgvector.NewVector(embedding), threshold}
+	args := []any{pgvector.NewVector(embedding), threshold, embeddingModel}
 	conditions := []string{
-		"archived_at is null",
+		"t.archived_at is null",
-		"1 - (embedding <=> $1) > $2",
+		"1 - (e.embedding <=> $1) > $2",
+		"e.model = $3",
 	}
 	if projectID != nil {
 		args = append(args, *projectID)
-		conditions = append(conditions, fmt.Sprintf("project_id = $%d", len(args)))
+		conditions = append(conditions, fmt.Sprintf("t.project_id = $%d", len(args)))
 	}
 	if excludeID != nil {
 		args = append(args, *excludeID)
-		conditions = append(conditions, fmt.Sprintf("id <> $%d", len(args)))
+		conditions = append(conditions, fmt.Sprintf("t.id <> $%d", len(args)))
 	}
 	args = append(args, limit)
 
 	query := `
-		select id, content, metadata, 1 - (embedding <=> $1) as similarity, created_at
+		select t.id, t.content, t.metadata, 1 - (e.embedding <=> $1) as similarity, t.created_at
-		from thoughts
+		from thoughts t
+		join embeddings e on e.thought_id = t.id
 		where ` + strings.Join(conditions, " and ") + fmt.Sprintf(`
-		order by embedding <=> $1
+		order by e.embedding <=> $1
 		limit $%d`, len(args))
 
 	rows, err := db.pool.Query(ctx, query, args...)

internal/tools/capture.go

@@ -83,7 +83,7 @@ func (t *CaptureTool) Handle(ctx context.Context, req *mcp.CallToolRequest, in C
 		thought.ProjectID = &project.ID
 	}
 
-	created, err := t.store.InsertThought(ctx, thought)
+	created, err := t.store.InsertThought(ctx, thought, t.provider.EmbeddingModel())
 	if err != nil {
 		return nil, CaptureOutput{}, err
 	}

internal/tools/context.go

@@ -76,7 +76,7 @@ func (t *ContextTool) Handle(ctx context.Context, req *mcp.CallToolRequest, in P
 		if err != nil {
 			return nil, ProjectContextOutput{}, err
 		}
-		semantic, err := t.store.SearchSimilarThoughts(ctx, embedding, t.search.DefaultThreshold, limit, &project.ID, nil)
+		semantic, err := t.store.SearchSimilarThoughts(ctx, embedding, t.provider.EmbeddingModel(), t.search.DefaultThreshold, limit, &project.ID, nil)
 		if err != nil {
 			return nil, ProjectContextOutput{}, err
 		}

internal/tools/links.go

@@ -121,7 +121,7 @@ func (t *LinksTool) Related(ctx context.Context, _ *mcp.CallToolRequest, in Rela
 		if err != nil {
 			return nil, RelatedOutput{}, err
 		}
-		semantic, err := t.store.SearchSimilarThoughts(ctx, embedding, t.search.DefaultThreshold, t.search.DefaultLimit, thought.ProjectID, &thought.ID)
+		semantic, err := t.store.SearchSimilarThoughts(ctx, embedding, t.provider.EmbeddingModel(), t.search.DefaultThreshold, t.search.DefaultLimit, thought.ProjectID, &thought.ID)
 		if err != nil {
 			return nil, RelatedOutput{}, err
 		}

internal/tools/recall.go

@@ -58,7 +58,7 @@ func (t *RecallTool) Handle(ctx context.Context, req *mcp.CallToolRequest, in Re
 		projectID = &project.ID
 	}
 
-	semantic, err := t.store.SearchSimilarThoughts(ctx, embedding, t.search.DefaultThreshold, limit, projectID, nil)
+	semantic, err := t.store.SearchSimilarThoughts(ctx, embedding, t.provider.EmbeddingModel(), t.search.DefaultThreshold, limit, projectID, nil)
 	if err != nil {
 		return nil, RecallOutput{}, err
 	}

internal/tools/search.go

@@ -54,12 +54,13 @@ func (t *SearchTool) Handle(ctx context.Context, req *mcp.CallToolRequest, in Se
 		return nil, SearchOutput{}, err
 	}
 
+	model := t.provider.EmbeddingModel()
 	var results []thoughttypes.SearchResult
 	if project != nil {
-		results, err = t.store.SearchSimilarThoughts(ctx, embedding, threshold, limit, &project.ID, nil)
+		results, err = t.store.SearchSimilarThoughts(ctx, embedding, model, threshold, limit, &project.ID, nil)
 		_ = t.store.TouchProject(ctx, project.ID)
 	} else {
-		results, err = t.store.SearchThoughts(ctx, embedding, threshold, limit, map[string]any{})
+		results, err = t.store.SearchThoughts(ctx, embedding, model, threshold, limit, map[string]any{})
 	}
 	if err != nil {
 		return nil, SearchOutput{}, err

internal/tools/summarize.go

@@ -56,7 +56,7 @@ func (t *SummarizeTool) Handle(ctx context.Context, req *mcp.CallToolRequest, in
 		if project != nil {
 			projectID = &project.ID
 		}
-		results, err := t.store.SearchSimilarThoughts(ctx, embedding, t.search.DefaultThreshold, limit, projectID, nil)
+		results, err := t.store.SearchSimilarThoughts(ctx, embedding, t.provider.EmbeddingModel(), t.search.DefaultThreshold, limit, projectID, nil)
 		if err != nil {
 			return nil, SummarizeOutput{}, err
 		}

internal/tools/update.go

@@ -48,7 +48,7 @@ func (t *UpdateTool) Handle(ctx context.Context, _ *mcp.CallToolRequest, in Upda
 	}
 
 	content := current.Content
-	embedding := current.Embedding
+	var embedding []float32
 	mergedMetadata := current.Metadata
 	projectID := current.ProjectID
 
@@ -79,7 +79,7 @@ func (t *UpdateTool) Handle(ctx context.Context, _ *mcp.CallToolRequest, in Upda
 		projectID = &project.ID
 	}
 
-	updated, err := t.store.UpdateThought(ctx, id, content, embedding, mergedMetadata, projectID)
+	updated, err := t.store.UpdateThought(ctx, id, content, embedding, t.provider.EmbeddingModel(), mergedMetadata, projectID)
 	if err != nil {
 		return nil, UpdateOutput{}, err
 	}

migrations/006_rls_and_grants.sql

@@ -1,5 +0,0 @@
--- Grant these permissions to the database role used by the application.
--- Replace amcs_user with the actual role in your deployment before applying.
-grant select, insert, update, delete on table public.thoughts to amcs_user;
-grant select, insert, update, delete on table public.projects to amcs_user;
-grant select, insert, update, delete on table public.thought_links to amcs_user;

migrations/007_embeddings_table.sql

@@ -0,0 +1,16 @@
+create table if not exists embeddings (
+  id        bigserial   primary key,
+  guid      uuid        not null default gen_random_uuid(),
+  thought_id uuid       not null references thoughts(id) on delete cascade,
+  model     text        not null,
+  dim       int         not null,
+  embedding vector      not null,
+  created_at timestamptz default now(),
+  updated_at timestamptz default now(),
+  constraint embeddings_guid_unique          unique (guid),
+  constraint embeddings_thought_model_unique unique (thought_id, model)
+);
+
+create index if not exists embeddings_thought_id_idx on embeddings (thought_id);
+
+alter table thoughts drop column if exists embedding;

migrations/008_update_match_thoughts.sql

@@ -0,0 +1,34 @@
+create or replace function match_thoughts(
+  query_embedding  vector,
+  match_threshold  float   default 0.7,
+  match_count      int     default 10,
+  filter           jsonb   default '{}'::jsonb,
+  embedding_model  text    default ''
+)
+returns table (
+  id          uuid,
+  content     text,
+  metadata    jsonb,
+  similarity  float,
+  created_at  timestamptz
+)
+language plpgsql
+as $$
+begin
+  return query
+  select
+    t.id,
+    t.content,
+    t.metadata,
+    1 - (e.embedding <=> query_embedding) as similarity,
+    t.created_at
+  from thoughts t
+  join embeddings e on e.thought_id = t.id
+  where 1 - (e.embedding <=> query_embedding) > match_threshold
+    and t.archived_at is null
+    and (embedding_model = '' or e.model = embedding_model)
+    and (filter = '{}'::jsonb or t.metadata @> filter)
+  order by e.embedding <=> query_embedding
+  limit match_count;
+end;
+$$;

migrations/009_rls_and_grants.sql

@@ -0,0 +1,7 @@
+-- Grant these permissions to the database role used by the application.
+-- Replace amcs_user with the actual role in your deployment before applying.
+grant ALL ON TABLE public.thoughts to amcs;
+grant ALL ON TABLE public.projects to amcs;
+grant ALL ON TABLE public.thought_links to amcs;
+grant ALL ON TABLE public.embeddings to amcs;
+GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO amcs;