diff --git a/engine/app/controllers/coplan/api/v1/comments_controller.rb b/engine/app/controllers/coplan/api/v1/comments_controller.rb
index d0b9645b..2291d5c1 100644
--- a/engine/app/controllers/coplan/api/v1/comments_controller.rb
+++ b/engine/app/controllers/coplan/api/v1/comments_controller.rb
@@ -125,6 +125,15 @@ def destroy
             )
           end
 
+          unless thread.anchored?
+            Broadcaster.replace_to(
+              @plan,
+              target: "plan-general-comments",
+              partial: "coplan/plans/general_comments",
+              locals: { threads: @plan.comment_threads.with_kept_comments.includes(:comments).order(:created_at) }
+            )
+          end
+
           render json: { comment_id: comment.id, deleted_at: comment.deleted_at }
         end
 
diff --git a/engine/app/javascript/controllers/coplan/comment_actions_controller.js b/engine/app/javascript/controllers/coplan/comment_actions_controller.js
index e1a4f6a4..a1819856 100644
--- a/engine/app/javascript/controllers/coplan/comment_actions_controller.js
+++ b/engine/app/javascript/controllers/coplan/comment_actions_controller.js
@@ -3,7 +3,7 @@ import { Controller } from "@hotwired/stimulus"
 // Reveals per-viewer edit and delete actions when this comment
 // belongs to the signed-in user. Broadcasts render once for all viewers
 // with no current_user, so the server emits the affordance for every
-// human comment and lets each browser decide whether to show it. The
+// human or local_agent comment and lets each browser decide whether to show it. The
 // server still enforces auth on submit — this is UX, not security.
 export default class extends Controller {
   static values = { authorId: String, authorType: String }
@@ -11,7 +11,7 @@ export default class extends Controller {
 
   connect() {
     const me = document.querySelector("meta[name='coplan-current-user-id']")?.content
-    this.isMine = this.authorTypeValue === "human" &&
+    this.isMine = ["human", "local_agent"].includes(this.authorTypeValue) &&
                    !!me &&
                    this.authorIdValue === me
     if (this.isMine && this.hasDeleteTarget) {
diff --git a/engine/app/policies/coplan/comment_policy.rb b/engine/app/policies/coplan/comment_policy.rb
index 01a8a3b0..579343f2 100644
--- a/engine/app/policies/coplan/comment_policy.rb
+++ b/engine/app/policies/coplan/comment_policy.rb
@@ -1,11 +1,11 @@
 module CoPlan
   class CommentPolicy < ApplicationPolicy
     def update?
-      delete? && !record.deleted?
+      record.author_type == "human" && delete? && !record.deleted?
     end
 
     def delete?
-      record.author_type == "human" && record.author_id == user&.id
+      user.present? && record.author_type.in?(%w[human local_agent]) && record.author_id == user.id
     end
   end
 end
diff --git a/engine/app/views/coplan/agent_instructions/guides/api.text.erb b/engine/app/views/coplan/agent_instructions/guides/api.text.erb
index 3d07212e..f684c1f5 100644
--- a/engine/app/views/coplan/agent_instructions/guides/api.text.erb
+++ b/engine/app/views/coplan/agent_instructions/guides/api.text.erb
@@ -38,7 +38,7 @@ Every endpoint, with the guide that explains it. All paths start with `<%= @base
 | `GET /api/v1/plans/:id/comments/:thread_id` | Get one thread. | comments |
 | `POST /api/v1/plans/:id/comments/:thread_id/reply` | Reply: `body_markdown`. | comments |
 | `PATCH /api/v1/plans/:id/comments/:thread_id/resolve` | Resolve a thread. | comments |
-| `DELETE /api/v1/plans/:id/comments/:comment_id/delete` | Delete one of your principal's own comments. Comments that an agent posted cannot be deleted. | comments |
+| `DELETE /api/v1/plans/:id/comments/:comment_id/delete` | Delete a human or local-agent comment attributed to your principal's account. | comments |
 
 ## References and attachments
 
diff --git a/engine/app/views/coplan/agent_instructions/guides/comments.text.erb b/engine/app/views/coplan/agent_instructions/guides/comments.text.erb
index bd751529..4136817c 100644
--- a/engine/app/views/coplan/agent_instructions/guides/comments.text.erb
+++ b/engine/app/views/coplan/agent_instructions/guides/comments.text.erb
@@ -57,7 +57,14 @@ Comment when you have a question, when an edit is not yours to make, or when you
 - Copy `anchor_text` exactly from the plan. CoPlan highlights it for readers. Choose a short, unique phrase. If the phrase occurs more than once, add `anchor_occurrence` (1 for the first occurrence).
 - Leave out `anchor_text` for a comment on the whole plan.
 - `@username` in a comment notifies that person. Usernames that do not exist stay plain text.
-- You cannot delete a comment that you posted. Write it carefully. To correct it, reply in the thread.
+- You can delete human and local-agent comments attributed to your principal's account, including comments from another token for that account.
+- You cannot delete another account's comments. Agent comments cannot be edited. To correct one, reply in the thread or delete it.
+
+To delete a comment, use its comment ID, not its thread ID:
+
+```bash
+<%= @curl %> -X DELETE "<%= @base %>/api/v1/plans/$PLAN_ID/comments/$COMMENT_ID/delete" | jq .
+```
 
 ## Review a plan
 
diff --git a/engine/app/views/coplan/comments/_comment.html.erb b/engine/app/views/coplan/comments/_comment.html.erb
index f9c393f9..208e2df7 100644
--- a/engine/app/views/coplan/comments/_comment.html.erb
+++ b/engine/app/views/coplan/comments/_comment.html.erb
@@ -1,7 +1,7 @@
 <%# Per-viewer affordances (Edit/Delete) are hidden client-side by the
     comment_actions Stimulus controller — one broadcast is shared with every
-    `current_user`, so we ship the button on every human comment and let
-    the browser remove it for non-authors. Server still enforces auth. %>
+    `current_user`, so we ship actions on human and local_agent comments and
+    let the browser reveal them for their owner. Server still enforces auth. %>
 <div class="comment <%= 'comment--deleted' if comment.deleted? %> <%= 'comment--agent' if comment.agent? %>"
      id="<%= dom_id(comment) %>"
      data-controller="coplan--comment-actions"
@@ -47,8 +47,12 @@
                 cancel_action: "coplan--comment-actions#cancelEdit" %>
         <% end %>
       </div>
+    <% end %>
+    <% if comment.author_type.in?(%w[human local_agent]) %>
       <div class="comment__actions" data-coplan--comment-actions-target="delete" hidden>
-        <button type="button" class="comment-window__action" data-action="coplan--comment-actions#edit">Edit</button>
+        <% if comment.author_type == "human" %>
+          <button type="button" class="comment-window__action" data-action="coplan--comment-actions#edit">Edit</button>
+        <% end %>
         <%= button_to "Delete",
               plan_comment_thread_comment_path(comment.comment_thread.plan, comment.comment_thread, comment),
               method: :delete,
diff --git a/spec/policies/coplan/comment_policy_spec.rb b/spec/policies/coplan/comment_policy_spec.rb
index ba07cd37..ca52feab 100644
--- a/spec/policies/coplan/comment_policy_spec.rb
+++ b/spec/policies/coplan/comment_policy_spec.rb
@@ -23,7 +23,7 @@
       expect(described_class.new(plan_author, comment).delete?).to be(false)
     end
 
-    it "forbids deleting agent comments even when caller matches author_id" do
+    it "forbids deleting legacy agent comments attributed to a token instead of a user" do
       token = create(:api_token, user: author)
       comment = create(:comment, comment_thread: thread, author_type: "local_agent", author_id: token.id, agent_name: "Amp")
       expect(described_class.new(author, comment).delete?).to be(false)
@@ -33,5 +33,37 @@
       comment = create(:comment, comment_thread: thread, author_type: "human", author_id: author.id)
       expect(described_class.new(nil, comment).delete?).to be(false)
     end
+
+    it "allows deleting an agent comment attributed to the user, but not editing it" do
+      comment = create(:comment, comment_thread: thread, author_type: "local_agent", author_id: author.id, agent_name: "Agent")
+      policy = described_class.new(author, comment)
+      expect(policy.delete?).to be(true)
+      expect(policy.update?).to be(false)
+      expect(described_class.new(other_user, comment).delete?).to be(false)
+      expect(described_class.new(plan_author, comment).delete?).to be(false)
+    end
+
+    %w[cloud_persona system].each do |author_type|
+      it "does not treat #{author_type} IDs as user attribution" do
+        comment = build(:comment, author_type: author_type, author_id: author.id)
+        expect(described_class.new(author, comment).delete?).to be(false)
+      end
+    end
+
+    it "forbids anonymous deletion of an unattributed agent comment" do
+      comment = build(:comment, author_type: "local_agent", author_id: nil, agent_name: "Agent")
+      expect(described_class.new(nil, comment).delete?).to be(false)
+    end
+  end
+
+  describe "#update?" do
+    it "allows only the human author to edit a kept comment" do
+      comment = create(:comment, comment_thread: thread, author_id: author.id)
+      expect(described_class.new(author, comment).update?).to be(true)
+      expect(described_class.new(other_user, comment).update?).to be(false)
+      comment.soft_delete!
+      expect(described_class.new(author, comment).update?).to be(false)
+      expect(described_class.new(author, comment).delete?).to be(true)
+    end
   end
 end
diff --git a/spec/requests/api/v1/comments_spec.rb b/spec/requests/api/v1/comments_spec.rb
index 5d7f8b69..b52713d8 100644
--- a/spec/requests/api/v1/comments_spec.rb
+++ b/spec/requests/api/v1/comments_spec.rb
@@ -164,17 +164,30 @@
       )
     end
 
-    it "forbids agent (token auth) callers from deleting their own agent comment" do
-      agent_comment = create(:comment,
-        comment_thread: thread_record,
-        author_type: "local_agent",
-        author_id: alice_token.id,
-        agent_name: "Amp",
-        body_markdown: "agent output")
+    it "soft-deletes an API-created agent comment using another token for the same account" do
+      post reply_api_v1_plan_comment_path(plan, thread_record),
+        params: { body_markdown: "Agent output" }, headers: headers, as: :json
+      expect(response).to have_http_status(:created)
+      agent_comment = CoPlan::Comment.find(JSON.parse(response.body)["comment_id"])
+      create(:api_token, user: alice, raw_token: "test-token-alice-other")
 
       delete api_v1_plan_destroy_comment_path(plan, id: agent_comment.id),
-        headers: headers,
-        as: :json
+        headers: { "Authorization" => "Bearer test-token-alice-other" }, as: :json
+      expect(response).to have_http_status(:ok)
+      expect(agent_comment.reload.deleted_at).to be_present
+      expect(JSON.parse(response.body)).to include("comment_id" => agent_comment.id)
+
+      expect {
+        delete api_v1_plan_destroy_comment_path(plan, id: agent_comment.id), headers: headers, as: :json
+      }.not_to change { plan.plan_events.where(event_type: "comment_deleted").count }
+      expect(response).to have_http_status(:ok)
+    end
+
+    it "forbids deleting another account's agent comment even as the plan author and admin" do
+      agent_comment = create(:comment, comment_thread: thread_record,
+        author_type: "local_agent", author_id: create(:coplan_user).id, agent_name: "Agent")
+
+      delete api_v1_plan_destroy_comment_path(plan, id: agent_comment.id), headers: headers, as: :json
       expect(response).to have_http_status(:forbidden)
       expect(agent_comment.reload.deleted_at).to be_nil
     end
diff --git a/spec/requests/comments_spec.rb b/spec/requests/comments_spec.rb
index bb561617..d2b7492f 100644
--- a/spec/requests/comments_spec.rb
+++ b/spec/requests/comments_spec.rb
@@ -130,6 +130,28 @@ def update_comment(body = "Revised **answer**")
       expect(response).to redirect_to(plan_page_path(plan))
     end
 
+    it "soft-deletes the user's agent comment and returns the replacement inline" do
+      comment.update!(author_type: "local_agent", agent_name: "Agent")
+      create(:comment, comment_thread: thread_record, author_id: alice.id, body_markdown: "Keep this reply")
+
+      delete plan_comment_thread_comment_path(plan, thread_record, comment),
+        headers: { "Accept" => "text/vnd.turbo-stream.html" }
+
+      expect(response).to have_http_status(:ok)
+      expect(comment.reload).to be_deleted
+      expect(response.body).to include('action="replace"', "Comment deleted")
+    end
+
+    it "protects another account's agent comment from the plan author and admin" do
+      comment.update!(author_type: "local_agent", author_id: create(:coplan_user).id, agent_name: "Agent")
+
+      delete plan_comment_thread_comment_path(plan, thread_record, comment)
+
+      expect(response).to redirect_to(plan_page_path(plan))
+      expect(comment.reload).not_to be_deleted
+      expect(flash[:alert]).to be_present
+    end
+
     it "redirects with alert when the user is not the comment author" do
       bob = create(:coplan_user)
       bobs_comment = create(:comment, comment_thread: thread_record, author_type: "human", author_id: bob.id, body_markdown: "alice can't touch this")
diff --git a/spec/system/comment_actions_spec.rb b/spec/system/comment_actions_spec.rb
new file mode 100644
index 00000000..9a3ce5f9
--- /dev/null
+++ b/spec/system/comment_actions_spec.rb
@@ -0,0 +1,94 @@
+require "rails_helper"
+
+RSpec.describe "Comment ownership actions", type: :system do
+  let(:author) { create(:coplan_user, email: "owner@example.com", name: "Comment Owner") }
+  let(:other_user) { create(:coplan_user, email: "reviewer@example.com", name: "Other Reviewer") }
+  let(:plan) { create(:plan, :considering, created_by_user: author, title: "Comment ownership example") }
+  let(:thread_record) { create(:comment_thread, plan: plan, plan_version: plan.current_plan_version, created_by_user: author) }
+
+  [ "light", "dark" ].each do |theme|
+    it "deletes only the user's own comments without offering agent edits in #{theme} mode" do
+      human = create(:comment, comment_thread: thread_record, author_id: author.id, body_markdown: "My review note")
+      agent = create(:comment, comment_thread: thread_record, author_type: "local_agent",
+        author_id: author.id, agent_name: "Agent", body_markdown: "My agent's review note")
+      others = %w[human local_agent].map do |author_type|
+        create(:comment, comment_thread: thread_record, author_type: author_type,
+          author_id: other_user.id, agent_name: author_type == "local_agent" ? "Agent" : nil,
+          body_markdown: "Another account's #{author_type} note")
+      end
+
+      visit sign_in_path
+      fill_in "Email address", with: author.email
+      click_button "Sign In"
+      expect(page).to have_current_path("/owner")
+      visit plan_page_path(plan)
+      page.execute_script("document.documentElement.dataset.theme = arguments[0]", theme)
+      find("#plan-general-comments button").click
+      panel = find(".thread-popover", visible: true)
+
+      within(panel.find("[data-comment-id='#{human.id}']")) do
+        expect(page).to have_button("Edit", exact: true)
+        expect(page).to have_button("Delete", exact: true)
+      end
+      others.each do |comment|
+        within(panel.find("[data-comment-id='#{comment.id}']")) do
+          expect(page).to have_no_button("Edit", exact: true)
+          expect(page).to have_no_button("Delete", exact: true)
+        end
+      end
+      within(panel.find("[data-comment-id='#{agent.id}']")) do
+        expect(page).to have_button("Delete", exact: true)
+        expect(page).to have_no_button("Edit", exact: true)
+        expect(page).to have_no_css(".comment__editor", visible: :all)
+      end
+      page.save_screenshot(Rails.root.join("tmp/comment-actions-#{theme}.png"))
+
+      dismiss_confirm("Delete this comment?") do
+        panel.find("[data-comment-id='#{agent.id}']").click_button "Delete"
+      end
+      expect(agent.reload).not_to be_deleted
+      accept_confirm("Delete this comment?") do
+        panel.find("[data-comment-id='#{agent.id}']").click_button "Delete"
+      end
+      expect(panel).to have_css("[data-comment-id='#{agent.id}']", text: "Comment deleted")
+      expect(agent.reload).to be_deleted
+      expect(panel.find("[data-comment-id='#{agent.id}']")).to have_no_button("Delete")
+      expect(human.reload).not_to be_deleted
+      expect(others.map { |comment| comment.reload.deleted? }).to eq([ false, false ])
+      page.save_screenshot(Rails.root.join("tmp/comment-actions-deleted-#{theme}.png"))
+    end
+
+    it "refreshes another viewer's document comments after API deletion in #{theme} mode" do
+      agent = create(:comment, comment_thread: thread_record, author_type: "local_agent",
+        author_id: author.id, agent_name: "Agent", body_markdown: "Agent thread opener")
+      reply = create(:comment, comment_thread: thread_record, author_id: author.id, body_markdown: "Remaining reply")
+      create(:api_token, user: author, raw_token: "test-comment-deletion")
+
+      visit sign_in_path
+      fill_in "Email address", with: other_user.email
+      click_button "Sign In"
+      expect(page).to have_css("meta[name='coplan-current-user-id'][content='#{other_user.id}']", visible: :all)
+      visit plan_page_path(plan)
+      page.execute_script("document.documentElement.dataset.theme = arguments[0]", theme)
+      expect(page).to have_css("turbo-cable-stream-source[connected]", visible: :all)
+      expect(page).to have_css("#plan-general-comments button", text: "Agent thread opener")
+
+      [ agent, reply ].each do |comment|
+        status = page.evaluate_async_script(<<~JS, api_v1_plan_destroy_comment_path(plan, id: comment.id))
+          const [url, done] = arguments;
+          fetch(url, { method: 'DELETE', headers: { Authorization: 'Bearer test-comment-deletion' } })
+            .then(response => done(response.status));
+        JS
+        expect(status).to eq(200)
+        expect(comment.reload).to be_deleted
+
+        if comment == agent
+          expect(page).to have_css("#plan-general-comments button", text: "Remaining reply")
+          expect(page).to have_no_css("#plan-general-comments button", text: "Agent thread opener")
+        else
+          expect(page).to have_no_css("#plan-general-comments", visible: true)
+        end
+      end
+    end
+  end
+end