diff --git a/.ameba.yml b/.ameba.yml
index 9319b70..ee790b8 100644
--- a/.ameba.yml
+++ b/.ameba.yml
@@ -1,9 +1,9 @@
 # This configuration file was generated by `ameba --gen-config`
-# on 2023-04-27 15:07:08 UTC using Ameba version 1.4.2.
+# on 2023-07-17 18:42:36 UTC using Ameba version 1.4.3.
 # The point is for the user to remove these configuration records
 # one by one as the reported problems are removed from the code base.
 
-# Problems found: 14
+# Problems found: 23
 # Run `ameba --only Layout/TrailingWhitespace` for details
 Layout/TrailingWhitespace:
   Description: Disallows trailing whitespace
@@ -13,10 +13,11 @@ Layout/TrailingWhitespace:
   - spec/cb/role_spec.cr
   - spec/cb/cluster_list_spec.cr
   - spec/cb/team_spec.cr
+  - spec/cb/config_param_spec.cr
   Enabled: true
   Severity: Convention
 
-# Problems found: 10
+# Problems found: 11
 # Run `ameba --only Style/QueryBoolMethods` for details
 Style/QueryBoolMethods:
   Description: Reports boolean properties without the `?` suffix
@@ -26,6 +27,7 @@ Style/QueryBoolMethods:
   - src/cb/cluster_list.cr
   - src/cb/cluster_upgrade.cr
   - src/cb/detach.cr
+  - src/cb/config_param.cr
   - src/cb/cluster_destroy.cr
   - src/cb/network.cr
   - src/cb/program.cr
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a03938..8019315 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- `cb config-param` command to manage supported cluster configuration
+  parameters. Supports `get`, `list-supported`, `reset` and `set`.
 
 ## [3.3.3] - 2023-05-18
 ### Added
diff --git a/spec/cb/completion_spec.cr b/spec/cb/completion_spec.cr
index 6a7dc98..a93a35b 100644
--- a/spec/cb/completion_spec.cr
+++ b/spec/cb/completion_spec.cr
@@ -261,6 +261,68 @@ Spectator.describe CB::Completion do
     expect(result).to_not have_option "-v"
   end
 
+  it "config-param" do
+    result = parse("cb config-param ")
+    expect(result).to have_option "get"
+    expect(result).to have_option "list-supported"
+    expect(result).to have_option "set"
+    expect(result).to have_option "reset"
+
+    # cb config-param get
+    result = parse("cb config-param get ")
+    expect(result).to have_option "--cluster"
+    expect(result).to have_option "--format"
+
+    result = parse("cb config-param get --cluster ")
+    expect(result).to eq expected_cluster_suggestion
+
+    result = parse("cb config-param get --cluster abc ")
+    expect(result).to have_option "--format"
+
+    result = parse("cb config-param get --format ")
+    expect(result).to eq ["json", "table"]
+
+    # cb config-param list-supported
+    result = parse("cb config-param list-supported ")
+    expect(result).to have_option "--format"
+
+    result = parse("cb config-param list-supported --format ")
+    expect(result).to eq ["json", "table"]
+
+    # cb config-param reset
+    result = parse("cb config-param reset ")
+    expect(result).to have_option "--allow-restart"
+    expect(result).to have_option "--cluster"
+    expect(result).to have_option "--format"
+
+    result = parse("cb config-param reset --cluster ")
+    expect(result).to eq expected_cluster_suggestion
+
+    result = parse("cb config-param reset --cluster abc ")
+    expect(result).to have_option "--format"
+
+    result = parse("cb config-param reset --allow-restart ")
+    expect(result).to eq ["false", "true"]
+
+    result = parse("cb config-param reset --format ")
+    expect(result).to eq ["json", "table"]
+
+    # cb config-param set
+    result = parse("cb config-param set ")
+    expect(result).to have_option "--allow-restart"
+    expect(result).to have_option "--cluster"
+    expect(result).to have_option "--format"
+
+    result = parse("cb config-param set --cluster ")
+    expect(result).to eq expected_cluster_suggestion
+
+    result = parse("cb config-param set --cluster abc ")
+    expect(result).to have_option "--allow-restart"
+
+    result = parse("cb config-param set --allow-restart ")
+    expect(result).to eq ["false", "true"]
+  end
+
   it "destroy" do
     result = parse("cb destroy ")
     expect(result).to eq expected_cluster_suggestion
diff --git a/spec/cb/config_param_spec.cr b/spec/cb/config_param_spec.cr
new file mode 100644
index 0000000..f624cd7
--- /dev/null
+++ b/spec/cb/config_param_spec.cr
@@ -0,0 +1,254 @@
+require "../spec_helper"
+
+Spectator.describe ConfigurationParameterGet do
+  subject(action) { described_class.new client: client, output: IO::Memory.new }
+
+  let(client) { Client.new TEST_TOKEN }
+  let(cluster) { Factory.cluster }
+
+  mock_client
+
+  describe "#validate" do
+    it "validates that required arguments are present" do
+      expect(&.validate).to raise_error Program::Error, /Missing required argument/
+
+      action.cluster_id = cluster.id
+
+      expect(&.validate).to be_true
+    end
+  end
+
+  describe "#call" do
+    before_each {
+      action.cluster_id = cluster.id
+    }
+
+    it "gets by name" do
+      action.args = ["postgres:max_connections"]
+
+      expect(client).to receive(:get_configuration_parameter).and_return(Factory.configuration_parameter)
+
+      action.call
+
+      expected = <<-EXPECTED
+        Component   Name              Value  
+        postgres    max_connections   100    \n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+
+    it "lists no parameters when none are set" do
+      expect(client).to receive(:list_configuration_parameters).and_return([] of CB::Model::ConfigurationParameter)
+
+      action.call
+
+      expected = <<-EXPECTED
+        Component   Name   Value  \n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+
+    it "outputs default format" do
+      expect(client).to receive(:list_configuration_parameters).and_return([Factory.configuration_parameter, Factory.configuration_parameter])
+
+      action.call
+
+      expected = <<-EXPECTED
+        Component   Name              Value  
+        postgres    max_connections   100    
+        postgres    max_connections   100    \n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+
+    it "outputs json format" do
+      action.format = Format::JSON
+
+      expect(client).to receive(:list_configuration_parameters).and_return([Factory.configuration_parameter])
+
+      action.call
+
+      expected = <<-EXPECTED
+      {
+        "parameters": [
+          {
+            "component": "postgres",
+            "name": "postgres:max_connections",
+            "parameter_name": "max_connections",
+            "requires_restart": false,
+            "value": "100"
+          }
+        ]
+      }\n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+  end
+end
+
+Spectator.describe ConfigurationParameterListSupported do
+  subject(action) { described_class.new client: client, output: IO::Memory.new }
+
+  let(client) { Client.new TEST_TOKEN }
+  let(cluster) { Factory.cluster }
+
+  mock_client
+
+  describe "#call" do
+    before_each {
+      expect(client).to receive(:list_supported_configuration_parameters).and_return [
+        Factory.configuration_parameter(value: nil),
+        Factory.configuration_parameter(
+          component: "pgbouncer",
+          name: "pgbouncer:default_pool_size",
+          parameter_name: "default_pool_size",
+          value: nil
+        ),
+      ]
+    }
+
+    it "outputs all" do
+      action.call
+
+      expected = <<-EXPECTED
+        Component   Name                Requires Restart  
+        postgres    max_connections     no                
+        pgbouncer   default_pool_size   no                \n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+
+    it "outputs specific component" do
+      action.args = ["postgres"]
+      action.call
+
+      expected = <<-EXPECTED
+        Component   Name              Requires Restart  
+        postgres    max_connections   no                \n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+  end
+end
+
+Spectator.describe ConfigurationParameterSet do
+  subject(action) { described_class.new client: client, output: IO::Memory.new }
+
+  let(client) { Client.new TEST_TOKEN }
+  let(cluster) { Factory.cluster }
+
+  mock_client
+
+  describe "#call" do
+    before_each {
+      action.args = ["postgres:max_connections=100"]
+      action.cluster_id = cluster.id
+    }
+
+    it "outputs default" do
+      expect(client).to receive(:update_configuration_parameters).and_return [Factory.configuration_parameter]
+
+      action.call
+
+      expected = <<-EXPECTED
+        Component   Name              Value  
+        postgres    max_connections   100    \n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+
+    it "outputs json format" do
+      action.format = Format::JSON
+
+      expect(client).to receive(:update_configuration_parameters).and_return([Factory.configuration_parameter])
+
+      action.call
+
+      expected = <<-EXPECTED
+        {
+          "parameters": [
+            {
+              "component": "postgres",
+              "name": "postgres:max_connections",
+              "parameter_name": "max_connections",
+              "requires_restart": false,
+              "value": "100"
+            }
+          ]
+        }\n
+        EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+  end
+end
+
+Spectator.describe ConfigurationParameterReset do
+  subject(action) { described_class.new client: client, output: IO::Memory.new }
+
+  let(client) { Client.new TEST_TOKEN }
+  let(cluster) { Factory.cluster }
+
+  mock_client
+
+  describe "#call" do
+    before_each {
+      action.cluster_id = cluster.id
+
+      expect(client).to receive(:update_configuration_parameters).and_return [Factory.configuration_parameter]
+    }
+
+    it "resets parameters" do
+      action.args = ["postgres:max_connections"]
+
+      action.call
+
+      expected = <<-EXPECTED
+        Component   Name              Value  
+        postgres    max_connections   100    \n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+
+    it "outputs default" do
+      action.call
+
+      expected = <<-EXPECTED
+        Component   Name              Value  
+        postgres    max_connections   100    \n
+      EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+
+    it "outputs json format" do
+      action.format = Format::JSON
+
+      action.call
+
+      expected = <<-EXPECTED
+        {
+          "parameters": [
+            {
+              "component": "postgres",
+              "name": "postgres:max_connections",
+              "parameter_name": "max_connections",
+              "requires_restart": false,
+              "value": "100"
+            }
+          ]
+        }\n
+        EXPECTED
+
+      expect(&.output.to_s).to eq expected
+    end
+  end
+end
diff --git a/spec/cb/login_spec.cr b/spec/cb/login_spec.cr
index 477c47c..706aa34 100644
--- a/spec/cb/login_spec.cr
+++ b/spec/cb/login_spec.cr
@@ -21,6 +21,7 @@ Spectator.describe CB::Login do
     let(client) { mock(Client) }
 
     before_each {
+      ENV["CB_API_KEY"] = nil
       action.client = client
       action.open_browser = ->(_url : String) { true }
       action.store_credentials = ->(_account : String, _secret : String) { true }
@@ -43,5 +44,10 @@ Spectator.describe CB::Login do
       result = action.call
       expect(result).to_not be_empty
     end
+
+    it "raises error if CB_API_KEY is set" do
+      ENV["CB_API_KEY"] = "cbkey_secret"
+      expect(&.call).to raise_error(CB::Program::Error)
+    end
   end
 end
diff --git a/spec/cb/open_spec.cr b/spec/cb/open_spec.cr
index 68e2706..31e6e87 100644
--- a/spec/cb/open_spec.cr
+++ b/spec/cb/open_spec.cr
@@ -16,6 +16,8 @@ Spectator.describe CB::Open do
     end
 
     it "creates a session and executes open" do
+      ENV["CB_API_KEY"] = nil
+
       open_args : Array(String)? = nil
 
       action.open = ->(args : Array(String), _env : Process::Env) do
@@ -36,5 +38,10 @@ Spectator.describe CB::Open do
       expected_login_url = "https://#{client_host}/sessions/#{session_id}/actions/login?one_time_token=#{session_one_time_token}"
       expect(open_args).to eq([expected_login_url])
     end
+
+    it "raises error if CB_API_KEY set" do
+      ENV["CB_API_KEY"] = "cbkey_secret"
+      expect(&.call).to raise_error(CB::Program::Error)
+    end
   end
 end
diff --git a/spec/factory.cr b/spec/factory.cr
index 52ea9cd..597b5c3 100644
--- a/spec/factory.cr
+++ b/spec/factory.cr
@@ -183,6 +183,18 @@ module Factory
     CB::Model::Role.new **params
   end
 
+  def configuration_parameter(**params)
+    params = {
+      component:        "postgres",
+      name:             "postgres:max_connections",
+      parameter_name:   "max_connections",
+      requires_restart: false,
+      value:            "100",
+    }.merge(params)
+
+    CB::Model::ConfigurationParameter.new **params
+  end
+
   def role_user(**params)
     params = {
       account_email: "user@example.com",
diff --git a/src/cb/completion.cr b/src/cb/completion.cr
index be60cf7..40b392b 100644
--- a/src/cb/completion.cr
+++ b/src/cb/completion.cr
@@ -46,6 +46,8 @@ class CB::Completion
       case args.first
       when "info", "rename", "logs", "suspend", "resume"
         single_cluster_suggestion
+      when "config-param"
+        config_param
       when "create"
         create
       when "destroy"
@@ -124,6 +126,7 @@ class CB::Completion
       "logs\tView live cluster logs",
       "suspend\tTemporarily turn off a cluster",
       "resume\tTurn on a suspended cluster",
+      "config-param\tManage configuration parameters",
     ]
     if @client
       options
@@ -385,6 +388,85 @@ class CB::Completion
     suggest
   end
 
+  def config_param
+    case @args[1]
+    when "get"
+      config_param_get
+    when "list-supported"
+      config_param_list_supported
+    when "reset"
+      config_param_reset
+    when "set"
+      config_param_set
+    else
+      [
+        "get\tdisplay configuration parameters",
+        "list-supported\tdisplay supported configuration parameters",
+        "reset\treset configuration parameters to the default value",
+        "set\tset configuration parameters",
+      ]
+    end
+  end
+
+  def config_param_get
+    cluster = find_arg_value "--cluster"
+
+    if last_arg?("--cluster")
+      return cluster.nil? ? cluster_suggestions : [] of String
+    end
+
+    if last_arg?("--format")
+      return ["json", "table"]
+    end
+
+    suggest = [] of String
+    suggest << "--cluster\tcluster id" unless has_full_flag? :cluster
+    suggest << "--format\toutput format" unless has_full_flag? :format
+    suggest
+  end
+
+  def config_param_list_supported
+    return ["json", "table"] if last_arg?("--format")
+
+    suggest = [] of String
+    suggest << "--format\toutput format" unless has_full_flag? :format
+    suggest
+  end
+
+  def config_param_reset
+    return ["false", "true"] if last_arg?("--allow-restart")
+
+    if last_arg?("--cluster")
+      cluster = find_arg_value "--cluster"
+      return cluster.nil? ? cluster_suggestions : [] of String
+    end
+
+    return ["json", "table"] if last_arg?("--format")
+
+    suggest = [] of String
+    suggest << "--allow-restart\tallow restart" unless has_full_flag? :allow_restart
+    suggest << "--cluster\tcluster id" unless has_full_flag? :cluster
+    suggest << "--format\toutput format" unless has_full_flag? :format
+    suggest
+  end
+
+  def config_param_set
+    return ["false", "true"] if last_arg?("--allow-restart")
+
+    if last_arg?("--cluster")
+      cluster = find_arg_value "--cluster"
+      return cluster.nil? ? cluster_suggestions : [] of String
+    end
+
+    return ["json", "table"] if last_arg?("--format")
+
+    suggest = [] of String
+    suggest << "--allow-restart\tallow restart" unless has_full_flag? :allow_restart
+    suggest << "--cluster\tcluster id" unless has_full_flag? :cluster
+    suggest << "--format\toutput format" unless has_full_flag? :format
+    suggest
+  end
+
   def maintenance
     case @args[1]
     when "info"
@@ -1081,6 +1163,7 @@ class CB::Completion
   # only return the long version, but search for long and short
   def find_full_flags
     full = Set(Symbol).new
+    full << :allow_restart if has_full_flag? "--allow-restart"
     full << :ha if has_full_flag? "--ha"
     full << :plan if has_full_flag? "--plan"
     full << :name if has_full_flag? "--name", "-n"
diff --git a/src/cb/config_param.cr b/src/cb/config_param.cr
new file mode 100644
index 0000000..93f3f70
--- /dev/null
+++ b/src/cb/config_param.cr
@@ -0,0 +1,165 @@
+require "./action"
+
+module CB
+  # API action for configuration parameters.
+  #
+  # All configuration parameter actions must inherit this action.
+  abstract class ConfigurationParameterAction < APIAction
+    # The cluster ID.
+    cluster_identifier_setter cluster_id
+
+    # The output format. The default format is table format.
+    format_setter format
+
+    # Flag to indicate whether the output should include a header. This only
+    # has an effect when the output format is a table.
+    property no_header : Bool = false
+
+    # List of configuration parameter argments for the action.
+    property args : Array(String) = [] of String
+
+    def validate
+      check_required_args do |missing|
+        missing << "cluster" if @cluster_id.empty?
+      end
+    end
+
+    def run
+      validate
+    end
+
+    protected def display(parameters : Array(Model::ConfigurationParameter))
+      case @format
+      when Format::Default
+        output_default(parameters)
+      when Format::JSON
+        output_json(parameters)
+      end
+    end
+
+    protected def output_default(parameters : Array(Model::ConfigurationParameter))
+      table = Table::TableBuilder.new(border: :none) do
+        columns do
+          add "Component"
+          add "Name"
+          add "Value"
+        end
+
+        header unless no_header
+
+        rows parameters.map { |p| [p.component, p.parameter_name, p.value_str] }
+      end
+
+      output << table.render << '\n'
+    end
+
+    protected def output_json(parameters : Array(Model::ConfigurationParameter))
+      output << {
+        "parameters": parameters,
+      }.to_pretty_json << '\n'
+    end
+  end
+
+  # Action for getting configuration parameters.
+  class ConfigurationParameterGet < ConfigurationParameterAction
+    def validate
+      raise Error.new "Too many arguments provided. Ensure that only one configuration parameter is given or none." unless @args.size <= 1
+      super
+    end
+
+    def run
+      validate
+
+      if @args.empty?
+        parameters = client.list_configuration_parameters(cluster_id[:cluster])
+      else
+        name = @args.try &.first
+        parameters = [client.get_configuration_parameter(cluster_id[:cluster], name)]
+      end
+
+      display(parameters)
+    end
+  end
+
+  class ConfigurationParameterListSupported < ConfigurationParameterAction
+    def run
+      parameters = client.list_supported_configuration_parameters
+      parameters = parameters.select { |p| @args.includes? p.component.to_s } unless args.empty?
+
+      case @format
+      when Format::Default, Format::Table
+        table = Table::TableBuilder.new(border: :none) do
+          columns do
+            add "Component"
+            add "Name"
+            add "Requires Restart"
+          end
+
+          header unless no_header
+
+          rows parameters.map { |p| [p.component, p.parameter_name, p.requires_restart ? "yes" : "no"] }
+        end
+
+        output << table.render << '\n'
+      when Format::JSON
+        output << {
+          "parameters": parameters.map do |p|
+            {
+              "component":       p.component,
+              "name":            p.name,
+              "parameter_name":  p.parameter_name,
+              "require_restart": p.requires_restart,
+            }
+          end,
+        }.to_pretty_json
+      else
+        raise Error.new("Format '#{@format}' is not supported for this command.")
+      end
+    end
+  end
+
+  # Action for setting configuration parameters.
+  class ConfigurationParameterSet < ConfigurationParameterAction
+    bool_setter allow_restart
+
+    def run
+      super
+
+      updated_parameters = @args.map do |arg|
+        parts = arg.split('=')
+        {"name" => parts[0], "value" => parts[1]}
+      rescue IndexError
+        raise Error.new("Invalid argument: #{arg}). Make sure that it has the following format <component>:<name>=<value>.")
+      end
+
+      begin
+        parameters = client.update_configuration_parameters(
+          cluster_id[:cluster],
+          parameters: updated_parameters,
+          allow_restart: @allow_restart
+        )
+      rescue e : CB::Client::Error
+        raise Error.new(e.message)
+      end
+
+      display(parameters)
+    end
+  end
+
+  # Action for resetting configuration parameters.
+  class ConfigurationParameterReset < ConfigurationParameterAction
+    bool_setter allow_restart
+
+    def run
+      super
+
+      parameters = client.update_configuration_parameters(
+        cluster_id[:cluster],
+        parameters: @args.map { |arg| {name: arg, "value": nil} },
+        allow_restart: @allow_restart,
+      )
+
+      display(parameters)
+    end
+  end
+end
diff --git a/src/cb/format.cr b/src/cb/format.cr
index 1572e14..c1e53b0 100644
--- a/src/cb/format.cr
+++ b/src/cb/format.cr
@@ -6,5 +6,9 @@ module CB
     List
     Table
     Tree
+
+    def to_s(io : IO)
+      io << self.to_s.downcase
+    end
   end
 end
diff --git a/src/cli.cr b/src/cli.cr
index fb92ba8..efa83af 100755
--- a/src/cli.cr
+++ b/src/cli.cr
@@ -171,6 +171,94 @@ op = OptionParser.new do |parser|
     EXAMPLES
   end
 
+  #
+  # Custom Configuration Parameter Management
+  #
+
+  parser.on("config-param", "Manage configuration parameters") do
+    parser.banner = "cb config-param <command>"
+
+    # TODO (abrightwell): would be really cool to implement this kind of
+    # support.
+    #
+    # parser.on("edit", "interactively edit config values") do
+    # parser.on("--cluster ID", "Choose cluster")
+    # end
+
+    parser.on("get", "display one or all configuration parameters for a cluster") do
+      parser.banner = "cb config-param get <--cluster> [NAME]"
+
+      get = set_action ConfigurationParameterGet
+      parser.on("--cluster ID", "Choose cluster") { |arg| get.cluster_id = arg }
+      parser.on("--format FORMAT", "Choose output format (default: table)") { |arg| get.format = arg }
+      parser.on("--no-header", "Do not display table header") { get.no_header = true }
+
+      parser.unknown_args { |args| get.args = args }
+
+      parser.examples = <<-EXAMPLES
+        Get a single configuration parameter:
+        $ cb config-params get --cluster <ID> postgres:max_connections
+
+        Get all configuration parameters:
+        $ cb config-params get --cluster <ID>
+      EXAMPLES
+    end
+
+    parser.on("list-supported", "display supported configuration parameters") do
+      parser.banner = "cb config-param list-supported"
+
+      supported = set_action ConfigurationParameterListSupported
+      parser.on("--format FORMAT", "Choose output format (default: table)") { |arg| supported.format = arg }
+      parser.on("--no-header", "Do not display table header") { supported.no_header = true }
+
+      parser.unknown_args { |args| supported.args = args }
+
+      parser.examples = <<-EXAMPLES
+        List all supported configuration parameters:
+        $ cb config-param list-supported
+
+        List all supported configuration parameters by component:
+        $ cb config-param list-supported postgres
+      EXAMPLES
+    end
+
+    parser.on("set", "set one or more configuration parameter values") do
+      parser.banner = "cb config-param set <--cluster> <NAME=VALUE> [...]"
+
+      set = set_action ConfigurationParameterSet
+      parser.on("--cluster ID", "Choose cluster") { |arg| set.cluster_id = arg }
+      parser.on("--allow-restart <true|false>", "Allow restarting the cluster (default: false).") { |arg| set.allow_restart = arg }
+
+      parser.unknown_args { |args| set.args = args }
+
+      parser.examples = <<-EXAMPLES
+        Set a single configuration parameter:
+        $ cb config-params set --cluster <ID> postgres:max_connections=100
+
+        Set multiple configuration parameters:
+        $ cb config-params set --cluster <ID> postgres:max_connections=100 postgres:hot_standby=off
+      EXAMPLES
+    end
+
+    parser.on("reset", "reset one or more configuration parameter values to default") do
+      parser.banner = "cb config-params reset <--cluster> <NAME [...]>"
+
+      reset = set_action ConfigurationParameterReset
+      parser.on("--cluster ID", "Choose cluster") { |arg| reset.cluster_id = arg }
+      parser.on("--allow-restart <true|false>", "Allow restarting the cluster (default: false).") { |arg| reset.allow_restart = arg }
+
+      parser.unknown_args { |args| reset.args = args }
+
+      parser.examples = <<-EXAMPLES
+        Reset a single configuration parameter:
+        $ cb config-param reset --cluster <ID> postgres:max_connections
+
+        Reset multiple configuration parameters:
+        $ cb config-param reset --cluster <ID> postgres:max_connections postgres:hot_standby
+      EXAMPLES
+    end
+  end
+
   # Cluster Upgrade
   parser.on("upgrade", "Manage a cluster upgrades") do
     parser.banner = "cb upgrade <start|status|cancel>"
diff --git a/src/client/config_param.cr b/src/client/config_param.cr
new file mode 100644
index 0000000..0d6012f
--- /dev/null
+++ b/src/client/config_param.cr
@@ -0,0 +1,29 @@
+require "./client"
+
+module CB
+  class Client
+    # Get configuration parameter value
+    def get_configuration_parameter(id : Identifier, name : String)
+      resp = get "clusters/#{id}/configuration-parameters/#{name}"
+      Model::ConfigurationParameter.from_json resp.body
+    end
+
+    # List configuration parameter values.
+    def list_configuration_parameters(id : Identifier)
+      resp = get "clusters/#{id}/configuration-parameters"
+      Array(Model::ConfigurationParameter).from_json resp.body, root: "parameters"
+    end
+
+    # List support configuration parameters
+    def list_supported_configuration_parameters
+      resp = get "configuration-parameters"
+      Array(Model::ConfigurationParameter).from_json resp.body, root: "parameters"
+    end
+
+    # Update configuration parameter values.
+    def update_configuration_parameters(id, parameters, allow_restart : Bool = false)
+      resp = put "clusters/#{id}/configuration-parameters", {"parameters": parameters, "allow_restart": allow_restart}
+      Array(Model::ConfigurationParameter).from_json resp.body, root: "parameters"
+    end
+  end
+end
diff --git a/src/client/error.cr b/src/client/error.cr
index b305420..74e977d 100644
--- a/src/client/error.cr
+++ b/src/client/error.cr
@@ -23,6 +23,12 @@ module CB
       end
     end
 
+    def message
+      JSON.parse(resp.body).as_h["message"].to_s
+    rescue JSON::ParseException
+      resp.body unless resp.body == ""
+    end
+
     def bad_request?
       resp.status == HTTP::Status::BAD_REQUEST
     end
diff --git a/src/ext/option_parser.cr b/src/ext/option_parser.cr
index 60617c7..3917052 100644
--- a/src/ext/option_parser.cr
+++ b/src/ext/option_parser.cr
@@ -42,7 +42,7 @@ class OptionParser
       io << '\n'
     end
 
-    unless examples.nil?
+    if examples
       io << '\n' << "Examples".colorize.bold << ":\n"
       io << examples << '\n'
     end
diff --git a/src/models/config_param.cr b/src/models/config_param.cr
new file mode 100644
index 0000000..3297f41
--- /dev/null
+++ b/src/models/config_param.cr
@@ -0,0 +1,17 @@
+module CB::Model
+  jrecord ConfigurationParameter,
+    component : String? = nil,
+    name : String = "",
+    parameter_name : String? = nil,
+    requires_restart : Bool = false,
+    value : String? = nil do
+    @[JSON::Field(key: "parameter_name", emit_null: false)]
+    def to_s(io : IO)
+      io << name.colorize.t_name << '=' << value
+    end
+
+    def value_str
+      @value ? @value : "default"
+    end
+  end
+end