diff --git a/internal/agent/controller/spec/controller.go b/internal/agent/controller/spec/controller.go
index 2d64942..1553536 100644
--- a/internal/agent/controller/spec/controller.go
+++ b/internal/agent/controller/spec/controller.go
@@ -45,17 +45,29 @@ func (c *Controller) reconcileAgent(ctx context.Context, client *client.Client,
 		return nil
 	}
 
-	specs, err := client.GetAgentSpecs(ctx, agent.ID)
+	specHeaders, err := client.QueryAgentSpecs(ctx, agent.ID)
 	if err != nil {
 		err = errors.WithStack(err)
-		logger.Error(ctx, "could not retrieve agent specs", logger.CapturedE(err))
+		logger.Error(ctx, "could not query agent specs", logger.CapturedE(err))
 
 		return nil
 	}
 
 	state.ClearSpecs()
 
-	for _, spec := range specs {
+	for _, sh := range specHeaders {
+		spec, err := client.GetAgentSpec(ctx, agent.ID, sh.DefinitionName, sh.DefinitionVersion)
+		if err != nil {
+			logger.Error(
+				ctx, "could not retrieve agent spec",
+				logger.F("specName", sh.DefinitionName),
+				logger.F("specVersion", sh.DefinitionVersion),
+				logger.CapturedE(errors.WithStack(err)),
+			)
+
+			continue
+		}
+
 		state.SetSpec(spec)
 	}
 
diff --git a/internal/command/client/agent/spec/get.go b/internal/command/client/agent/spec/get.go
index 7dc0aa0..03723a2 100644
--- a/internal/command/client/agent/spec/get.go
+++ b/internal/command/client/agent/spec/get.go
@@ -15,8 +15,18 @@ import (
 func GetCommand() *cli.Command {
 	return &cli.Command{
 		Name:  "get",
-		Usage: "Get agent specifications",
-		Flags: agentFlag.WithAgentFlags(),
+		Usage: "Get agent specification",
+		Flags: agentFlag.WithAgentFlags(
+			&cli.StringFlag{
+				Name:  "spec-name",
+				Usage: "use `NAME` as specification's name",
+			},
+			&cli.StringFlag{
+				Name:  "spec-version",
+				Usage: "use `VERSION` as specification's version",
+				Value: "0.0.0",
+			},
+		),
 		Action: func(ctx *cli.Context) error {
 			baseFlags := clientFlag.GetBaseFlags(ctx)
 			agentID, err := agentFlag.AssertAgentID(ctx)
@@ -29,16 +39,26 @@ func GetCommand() *cli.Command {
 				return errors.WithStack(apierr.Wrap(err))
 			}
 
+			specDefName, err := assertSpecDefName(ctx)
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			specDefVersion, err := assertSpecDefVersion(ctx)
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
 			client := client.New(baseFlags.ServerURL, client.WithToken(token))
 
-			specs, err := client.GetAgentSpecs(ctx.Context, agentID)
+			spec, err := client.GetAgentSpec(ctx.Context, agentID, specDefName, specDefVersion)
 			if err != nil {
 				return errors.WithStack(apierr.Wrap(err))
 			}
 
 			hints := specHints(baseFlags.OutputMode)
 
-			if err := format.Write(baseFlags.Format, os.Stdout, hints, clientFlag.AsAnySlice(specs)...); err != nil {
+			if err := format.Write(baseFlags.Format, os.Stdout, hints, spec); err != nil {
 				return errors.WithStack(err)
 			}
 
diff --git a/internal/command/client/agent/spec/hints.go b/internal/command/client/agent/spec/hints.go
index 3b47ef9..062d023 100644
--- a/internal/command/client/agent/spec/hints.go
+++ b/internal/command/client/agent/spec/hints.go
@@ -5,14 +5,28 @@ import (
 	"gitlab.com/wpetit/goweb/cli/format/table"
 )
 
+func specHeaderHints(outputMode format.OutputMode) format.Hints {
+	return format.Hints{
+		OutputMode: outputMode,
+		Props: []format.Prop{
+			format.NewProp("ID", "ID"),
+			format.NewProp("DefinitionName", "Def. Name"),
+			format.NewProp("DefinitionVersion", "Def. Version"),
+			format.NewProp("Revision", "Revision"),
+			format.NewProp("CreatedAt", "CreatedAt", table.WithCompactModeMaxColumnWidth(20)),
+			format.NewProp("UpdatedAt", "UpdatedAt", table.WithCompactModeMaxColumnWidth(20)),
+		},
+	}
+}
+
 func specHints(outputMode format.OutputMode) format.Hints {
 	return format.Hints{
 		OutputMode: outputMode,
 		Props: []format.Prop{
 			format.NewProp("ID", "ID"),
-			format.NewProp("Revision", "Revision"),
 			format.NewProp("DefinitionName", "Def. Name"),
 			format.NewProp("DefinitionVersion", "Def. Version"),
+			format.NewProp("Revision", "Revision"),
 			format.NewProp("Data", "Data"),
 			format.NewProp("CreatedAt", "CreatedAt", table.WithCompactModeMaxColumnWidth(20)),
 			format.NewProp("UpdatedAt", "UpdatedAt", table.WithCompactModeMaxColumnWidth(20)),
diff --git a/internal/command/client/agent/spec/query.go b/internal/command/client/agent/spec/query.go
new file mode 100644
index 0000000..a43c81a
--- /dev/null
+++ b/internal/command/client/agent/spec/query.go
@@ -0,0 +1,48 @@
+package spec
+
+import (
+	"os"
+
+	agentFlag "forge.cadoles.com/Cadoles/emissary/internal/command/client/agent/flag"
+	"forge.cadoles.com/Cadoles/emissary/internal/command/client/apierr"
+	clientFlag "forge.cadoles.com/Cadoles/emissary/internal/command/client/flag"
+	"forge.cadoles.com/Cadoles/emissary/pkg/client"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli/v2"
+	"gitlab.com/wpetit/goweb/cli/format"
+)
+
+func QueryCommand() *cli.Command {
+	return &cli.Command{
+		Name:  "query",
+		Usage: "Query agent specifications",
+		Flags: agentFlag.WithAgentFlags(),
+		Action: func(ctx *cli.Context) error {
+			baseFlags := clientFlag.GetBaseFlags(ctx)
+			agentID, err := agentFlag.AssertAgentID(ctx)
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			token, err := clientFlag.GetToken(baseFlags)
+			if err != nil {
+				return errors.WithStack(apierr.Wrap(err))
+			}
+
+			client := client.New(baseFlags.ServerURL, client.WithToken(token))
+
+			specs, err := client.QueryAgentSpecs(ctx.Context, agentID)
+			if err != nil {
+				return errors.WithStack(apierr.Wrap(err))
+			}
+
+			hints := specHeaderHints(baseFlags.OutputMode)
+
+			if err := format.Write(baseFlags.Format, os.Stdout, hints, clientFlag.AsAnySlice(specs)...); err != nil {
+				return errors.WithStack(err)
+			}
+
+			return nil
+		},
+	}
+}
diff --git a/internal/command/client/agent/spec/root.go b/internal/command/client/agent/spec/root.go
index 1f0c386..d31c494 100644
--- a/internal/command/client/agent/spec/root.go
+++ b/internal/command/client/agent/spec/root.go
@@ -10,6 +10,7 @@ func Root() *cli.Command {
 		Usage: "Specifications related commands",
 		Subcommands: []*cli.Command{
 			GetCommand(),
+			QueryCommand(),
 			UpdateCommand(),
 			DeleteCommand(),
 		},
diff --git a/internal/command/client/agent/spec/update.go b/internal/command/client/agent/spec/update.go
index 026cc57..d27402b 100644
--- a/internal/command/client/agent/spec/update.go
+++ b/internal/command/client/agent/spec/update.go
@@ -12,6 +12,7 @@ import (
 	jsonpatch "github.com/evanphx/json-patch/v5"
 	"github.com/pkg/errors"
 	"github.com/urfave/cli/v2"
+	"gitlab.com/wpetit/goweb/api"
 	"gitlab.com/wpetit/goweb/cli/format"
 )
 
@@ -73,21 +74,12 @@ func UpdateCommand() *cli.Command {
 
 			client := client.New(baseFlags.ServerURL, client.WithToken(token))
 
-			specs, err := client.GetAgentSpecs(ctx.Context, agentID)
+			existingSpec, err := client.GetAgentSpec(ctx.Context, agentID, specDefName, specDefVersion)
 			if err != nil {
-				return errors.WithStack(apierr.Wrap(err))
-			}
-
-			var existingSpec spec.Spec
-
-			for _, s := range specs {
-				if s.SpecDefinitionName() != specDefName || s.SpecDefinitionVersion() != specDefVersion {
-					continue
+				var apiErr api.Error
+				if !errors.As(err, &apiErr) || apiErr.Code != api.ErrCodeNotFound {
+					return errors.WithStack(apierr.Wrap(err))
 				}
-
-				existingSpec = s
-
-				break
 			}
 
 			revision := 0
diff --git a/internal/datastore/agent_repository.go b/internal/datastore/agent_repository.go
index 59c943e..5cb6525 100644
--- a/internal/datastore/agent_repository.go
+++ b/internal/datastore/agent_repository.go
@@ -19,7 +19,8 @@ type AgentRepository interface {
 	Delete(ctx context.Context, id AgentID) error
 
 	UpdateSpec(ctx context.Context, id AgentID, name string, version string, revision int, data map[string]any) (*Spec, error)
-	GetSpecs(ctx context.Context, id AgentID) ([]*Spec, error)
+	QuerySpecs(ctx context.Context, id AgentID) ([]*SpecHeader, error)
+	GetSpec(ctx context.Context, id AgentID, name string, version string) (*Spec, error)
 	DeleteSpec(ctx context.Context, id AgentID, name string, version string) error
 }
 
diff --git a/internal/datastore/spec.go b/internal/datastore/spec.go
index c04c426..bd3468e 100644
--- a/internal/datastore/spec.go
+++ b/internal/datastore/spec.go
@@ -6,16 +6,21 @@ import (
 
 type SpecID int64
 
+type SpecHeader struct {
+	ID                SpecID    `json:"id"`
+	DefinitionName    string    `json:"name"`
+	DefinitionVersion string    `json:"version"`
+	Revision          int       `json:"revision"`
+	CreatedAt         time.Time `json:"createdAt"`
+	UpdatedAt         time.Time `json:"updatedAt"`
+	TenantID          TenantID  `json:"tenantId"`
+	AgentID           AgentID   `json:"agentId"`
+}
+
 type Spec struct {
-	ID                SpecID         `json:"id"`
-	DefinitionName    string         `json:"name"`
-	DefinitionVersion string         `json:"version"`
-	Data              map[string]any `json:"data"`
-	Revision          int            `json:"revision"`
-	CreatedAt         time.Time      `json:"createdAt"`
-	UpdatedAt         time.Time      `json:"updatedAt"`
-	TenantID          TenantID       `json:"tenantId"`
-	AgentID           AgentID        `json:"agentId"`
+	SpecHeader
+
+	Data map[string]any `json:"data"`
 }
 
 func (s *Spec) SpecDefinitionName() string {
diff --git a/internal/datastore/sqlite/agent_repository.go b/internal/datastore/sqlite/agent_repository.go
index 73e9407..ca0d243 100644
--- a/internal/datastore/sqlite/agent_repository.go
+++ b/internal/datastore/sqlite/agent_repository.go
@@ -154,9 +154,44 @@ func (r *AgentRepository) DeleteSpec(ctx context.Context, agentID datastore.Agen
 	return nil
 }
 
+// GetSpec implements datastore.AgentRepository.
+func (r *AgentRepository) GetSpec(ctx context.Context, agentID datastore.AgentID, name string, version string) (*datastore.Spec, error) {
+	var spec datastore.Spec
+
+	err := r.withTxRetry(ctx, func(tx *sql.Tx) error {
+		exists, err := r.agentExists(ctx, tx, agentID)
+		if err != nil {
+			return errors.WithStack(err)
+		}
+
+		if !exists {
+			return errors.WithStack(datastore.ErrNotFound)
+		}
+
+		query := `SELECT id, name, version, revision, data, created_at, updated_at, agent_id, tenant_id FROM specs WHERE agent_id = $1 AND name = $2 AND version = $3`
+
+		row := tx.QueryRowContext(ctx, query, agentID, name, version)
+
+		var data JSONMap
+
+		if err := row.Scan(&spec.ID, &spec.DefinitionName, &spec.DefinitionVersion, &spec.Revision, &data, &spec.CreatedAt, &spec.UpdatedAt, &spec.AgentID, &spec.TenantID); err != nil {
+			return errors.WithStack(err)
+		}
+
+		spec.Data = data
+
+		return nil
+	})
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	return &spec, nil
+}
+
 // GetSpecs implements datastore.AgentRepository.
-func (r *AgentRepository) GetSpecs(ctx context.Context, agentID datastore.AgentID) ([]*datastore.Spec, error) {
-	specs := make([]*datastore.Spec, 0)
+func (r *AgentRepository) QuerySpecs(ctx context.Context, agentID datastore.AgentID) ([]*datastore.SpecHeader, error) {
+	specs := make([]*datastore.SpecHeader, 0)
 
 	err := r.withTxRetry(ctx, func(tx *sql.Tx) error {
 		exists, err := r.agentExists(ctx, tx, agentID)
@@ -169,7 +204,7 @@ func (r *AgentRepository) GetSpecs(ctx context.Context, agentID datastore.AgentI
 		}
 
 		query := `
-		SELECT id, name, version, revision, data, created_at, updated_at, agent_id, tenant_id
+		SELECT id, name, version, revision, created_at, updated_at, agent_id, tenant_id
 		FROM specs
 		WHERE agent_id = $1
 		`
@@ -187,19 +222,16 @@ func (r *AgentRepository) GetSpecs(ctx context.Context, agentID datastore.AgentI
 		}()
 
 		for rows.Next() {
-			spec := &datastore.Spec{}
-
-			data := JSONMap{}
+			spec := &datastore.SpecHeader{}
 
 			var tenantID sql.NullString
-			if err := rows.Scan(&spec.ID, &spec.DefinitionName, &spec.DefinitionVersion, &spec.Revision, &data, &spec.CreatedAt, &spec.UpdatedAt, &spec.AgentID, &tenantID); err != nil {
+			if err := rows.Scan(&spec.ID, &spec.DefinitionName, &spec.DefinitionVersion, &spec.Revision, &spec.CreatedAt, &spec.UpdatedAt, &spec.AgentID, &tenantID); err != nil {
 				return errors.WithStack(err)
 			}
 
 			if tenantID.Valid {
 				spec.TenantID = datastore.TenantID(tenantID.String)
 			}
-			spec.Data = data
 
 			specs = append(specs, spec)
 		}
diff --git a/internal/datastore/testsuite/agent_repository_cases.go b/internal/datastore/testsuite/agent_repository_cases.go
index 0364542..703345f 100644
--- a/internal/datastore/testsuite/agent_repository_cases.go
+++ b/internal/datastore/testsuite/agent_repository_cases.go
@@ -84,11 +84,11 @@ var agentRepositoryTestCases = []agentRepositoryTestCase{
 		},
 	},
 	{
-		Name: "Try to get specs of an unexistant agent",
+		Name: "Try to query specs of an unexistant agent",
 		Run: func(ctx context.Context, repo datastore.AgentRepository) error {
 			var unexistantAgentID datastore.AgentID = 9999
 
-			specs, err := repo.GetSpecs(ctx, unexistantAgentID)
+			specs, err := repo.QuerySpecs(ctx, unexistantAgentID)
 			if err == nil {
 				return errors.New("error should not be nil")
 			}
diff --git a/internal/server/api/get_agent_specs.go b/internal/server/api/get_agent_spec.go
similarity index 67%
rename from internal/server/api/get_agent_specs.go
rename to internal/server/api/get_agent_spec.go
index fce7a56..e7f3a51 100644
--- a/internal/server/api/get_agent_specs.go
+++ b/internal/server/api/get_agent_spec.go
@@ -4,20 +4,24 @@ import (
 	"net/http"
 
 	"forge.cadoles.com/Cadoles/emissary/internal/datastore"
+	"github.com/go-chi/chi/v5"
 	"github.com/pkg/errors"
 	"gitlab.com/wpetit/goweb/api"
 	"gitlab.com/wpetit/goweb/logger"
 )
 
-func (m *Mount) getAgentSpecs(w http.ResponseWriter, r *http.Request) {
+func (m *Mount) getAgentSpec(w http.ResponseWriter, r *http.Request) {
 	agentID, ok := getAgentID(w, r)
 	if !ok {
 		return
 	}
 
+	specName := chi.URLParam(r, "specName")
+	specVersion := chi.URLParam(r, "specVersion")
+
 	ctx := r.Context()
 
-	specs, err := m.agentRepo.GetSpecs(ctx, agentID)
+	spec, err := m.agentRepo.GetSpec(ctx, agentID, specName, specVersion)
 	if err != nil {
 		if errors.Is(err, datastore.ErrNotFound) {
 			api.ErrorResponse(w, http.StatusNotFound, ErrCodeNotFound, nil)
@@ -34,8 +38,8 @@ func (m *Mount) getAgentSpecs(w http.ResponseWriter, r *http.Request) {
 	}
 
 	api.DataResponse(w, http.StatusOK, struct {
-		Specs []*datastore.Spec `json:"specs"`
+		Spec *datastore.Spec `json:"spec"`
 	}{
-		Specs: specs,
+		Spec: spec,
 	})
 }
diff --git a/internal/server/api/mount.go b/internal/server/api/mount.go
index 178fcf7..3610ab4 100644
--- a/internal/server/api/mount.go
+++ b/internal/server/api/mount.go
@@ -35,7 +35,8 @@ func (m *Mount) Mount(r chi.Router) {
 			r.With(assertAgentOrUserWithWriteAccess).Put("/{agentID}", m.updateAgent)
 			r.With(assertUserWithWriteAccess).Delete("/{agentID}", m.deleteAgent)
 
-			r.With(assertAgentOrUserWithReadAccess).Get("/{agentID}/specs", m.getAgentSpecs)
+			r.With(assertAgentOrUserWithReadAccess).Get("/{agentID}/specs", m.queryAgentSpec)
+			r.With(assertAgentOrUserWithReadAccess).Get("/{agentID}/specs/{specName}/{specVersion}", m.getAgentSpec)
 			r.With(assertUserWithWriteAccess).Post("/{agentID}/specs", m.updateAgentSpec)
 			r.With(assertUserWithWriteAccess).Delete("/{agentID}/specs", m.deleteAgentSpec)
 		})
diff --git a/internal/server/api/query_agent_specs.go b/internal/server/api/query_agent_specs.go
new file mode 100644
index 0000000..d4282a2
--- /dev/null
+++ b/internal/server/api/query_agent_specs.go
@@ -0,0 +1,55 @@
+package api
+
+import (
+	"net/http"
+
+	"forge.cadoles.com/Cadoles/emissary/internal/datastore"
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/api"
+	"gitlab.com/wpetit/goweb/logger"
+)
+
+func (m *Mount) queryAgentSpec(w http.ResponseWriter, r *http.Request) {
+	agentID, ok := getAgentID(w, r)
+	if !ok {
+		return
+	}
+
+	ctx := r.Context()
+
+	specHeaders, err := m.agentRepo.QuerySpecs(ctx, agentID)
+	if err != nil {
+		if errors.Is(err, datastore.ErrNotFound) {
+			api.ErrorResponse(w, http.StatusNotFound, ErrCodeNotFound, nil)
+
+			return
+		}
+
+		err = errors.WithStack(err)
+		logger.Error(ctx, "could not query specs", logger.CapturedE(err))
+
+		api.ErrorResponse(w, http.StatusInternalServerError, ErrCodeUnknownError, nil)
+
+		return
+	}
+
+	// Retro-compatibility mode: return full specs temporarily
+	specs := make([]*datastore.Spec, 0, len(specHeaders))
+	for _, sh := range specHeaders {
+		spec, err := m.agentRepo.GetSpec(ctx, agentID, sh.DefinitionName, sh.DefinitionVersion)
+		if err != nil {
+			err = errors.WithStack(err)
+			logger.Error(ctx, "could not query specs", logger.CapturedE(err))
+
+			api.ErrorResponse(w, http.StatusInternalServerError, ErrCodeUnknownError, nil)
+		}
+
+		specs = append(specs, spec)
+	}
+
+	api.DataResponse(w, http.StatusOK, struct {
+		Specs []*datastore.Spec `json:"specs"`
+	}{
+		Specs: specs,
+	})
+}
diff --git a/pkg/client/get_agent_spec.go b/pkg/client/get_agent_spec.go
new file mode 100644
index 0000000..c97b038
--- /dev/null
+++ b/pkg/client/get_agent_spec.go
@@ -0,0 +1,27 @@
+package client
+
+import (
+	"context"
+	"fmt"
+
+	"forge.cadoles.com/Cadoles/emissary/internal/datastore"
+	"github.com/pkg/errors"
+)
+
+func (c *Client) GetAgentSpec(ctx context.Context, agentID AgentID, specName string, specVersion string, funcs ...OptionFunc) (*datastore.Spec, error) {
+	response := withResponse[struct {
+		Spec *datastore.Spec `json:"spec"`
+	}]()
+
+	path := fmt.Sprintf("/api/v1/agents/%d/specs/%s/%s", agentID, specName, specVersion)
+
+	if err := c.apiGet(ctx, path, &response, funcs...); err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	if response.Error != nil {
+		return nil, errors.WithStack(response.Error)
+	}
+
+	return response.Data.Spec, nil
+}
diff --git a/pkg/client/get_agent_specs.go b/pkg/client/query_agent_specs.go
similarity index 53%
rename from pkg/client/get_agent_specs.go
rename to pkg/client/query_agent_specs.go
index a855375..b29797c 100644
--- a/pkg/client/get_agent_specs.go
+++ b/pkg/client/query_agent_specs.go
@@ -5,13 +5,12 @@ import (
 	"fmt"
 
 	"forge.cadoles.com/Cadoles/emissary/internal/datastore"
-	"forge.cadoles.com/Cadoles/emissary/internal/spec"
 	"github.com/pkg/errors"
 )
 
-func (c *Client) GetAgentSpecs(ctx context.Context, agentID AgentID, funcs ...OptionFunc) ([]Spec, error) {
+func (c *Client) QueryAgentSpecs(ctx context.Context, agentID AgentID, funcs ...OptionFunc) ([]*datastore.SpecHeader, error) {
 	response := withResponse[struct {
-		Specs []*datastore.Spec `json:"specs"`
+		Specs []*datastore.SpecHeader `json:"specs"`
 	}]()
 
 	path := fmt.Sprintf("/api/v1/agents/%d/specs", agentID)
@@ -24,10 +23,5 @@ func (c *Client) GetAgentSpecs(ctx context.Context, agentID AgentID, funcs ...Op
 		return nil, errors.WithStack(response.Error)
 	}
 
-	specs := make([]spec.Spec, 0, len(response.Data.Specs))
-	for _, s := range response.Data.Specs {
-		specs = append(specs, spec.Spec(s))
-	}
-
-	return specs, nil
+	return response.Data.Specs, nil
 }