for-annie.diff

diff --git a/command/registry.go b/command/registry.go
index f3e0011b7..db81cc626 100644
--- a/command/registry.go
+++ b/command/registry.go
@@ -178,7 +178,12 @@ func (r *commandRegistry) renderCommands(commandInfo model.PluginCommandConf,
 		}
 
 		cmd := factory()
-		if err = cmd.ParseParams(c.Params); err != nil {
+		params, err := c.Params.Resolve()
+		if err != nil {
+			errs = append(errs, err)
+		}
+
+		if err = cmd.ParseParams(params); err != nil {
 			errs = append(errs, errors.Wrapf(err, "problem parsing input of %s (%s)", c.Command, c.DisplayName).Error())
 			continue
 		}
diff --git a/model/project.go b/model/project.go
index 6a041567d..9171c4c6f 100644
--- a/model/project.go
+++ b/model/project.go
@@ -1,6 +1,7 @@
 package model
 
 import (
+	"encoding/json"
 	"fmt"
 	"reflect"
 	"regexp"
@@ -260,7 +261,7 @@ type PluginCommandConf struct {
 	TimeoutSecs int `yaml:"timeout_secs,omitempty" bson:"timeout_secs"`
 
 	// Params are used to supply configuratiion specific information.
-	Params map[string]interface{} `yaml:"params,omitempty" bson:"params"`
+	Params string `yaml:"params,omitempty" bson:"params"`
 
 	// Vars defines variables that can be used within commands.
 	Vars map[string]string `yaml:"vars,omitempty" bson:"vars"`
@@ -268,6 +269,11 @@ type PluginCommandConf struct {
 	Loggers *LoggerConfig `yaml:"loggers,omitempty" bson:"loggers,omitempty"`
 }
 
+func (p *PluginCommandConf) Resolve() (map[string]interface{}, error) {
+	out := map[string]interface{}{}
+	return json.Unmarshal(&out, []byte(p.Params))
+}
+
 type ArtifactInstructions struct {
 	Include      []string `yaml:"include,omitempty" bson:"include"`
 	ExcludeFiles []string `yaml:"excludefiles,omitempty" bson:"exclude_files"`
@@ -1241,7 +1247,7 @@ func (p *Project) TasksThatCallCommand(find string) map[string]int {
 
 // IsGenerateTask indicates that the task generates other tasks, which the
 // scheduler will use to prioritize this task.
-func (p *Project) IsGenerateTask(taskName string) bool {
+func (p *Project) IsGyenerateTask(taskName string) bool {
 	_, ok := p.TasksThatCallCommand(evergreen.GenerateTasksCommandName)[taskName]
 	return ok
 }