diff --git a/app/src/services/api/agentTeamApi.test.ts b/app/src/services/api/agentTeamApi.test.ts
index 88dcaac90..ab9eca54b 100644
--- a/app/src/services/api/agentTeamApi.test.ts
+++ b/app/src/services/api/agentTeamApi.test.ts
@@ -123,3 +123,78 @@ describe('agentTeamApi.listMessages', () => {
     });
   });
 });
+
+describe('agentTeamApi.completeTask', () => {
+  it('unwraps { result } and defaults evidence + requireEvidence', async () => {
+    mockCall.mockResolvedValueOnce({ result: { kind: 'completed', id: 'task-1', status: 'done' } });
+    const outcome = await agentTeamApi.completeTask({
+      teamId: 'team-1',
+      taskId: 'task-1',
+      memberId: 'm1',
+    });
+    expect(outcome.kind).toBe('completed');
+    expect(mockCall).toHaveBeenCalledWith({
+      method: 'openhuman.agent_team_complete_task',
+      params: {
+        teamId: 'team-1',
+        taskId: 'task-1',
+        memberId: 'm1',
+        evidence: [],
+        requireEvidence: false,
+      },
+    });
+  });
+
+  it('forwards evidence + requireEvidence and surfaces a gateFailed outcome', async () => {
+    mockCall.mockResolvedValueOnce({
+      result: { kind: 'gateFailed', reasons: ['completion requires at least one evidence link'] },
+    });
+    const outcome = await agentTeamApi.completeTask({
+      teamId: 'team-1',
+      taskId: 'task-1',
+      memberId: 'm1',
+      evidence: ['proof'],
+      requireEvidence: true,
+    });
+    expect(outcome).toEqual({
+      kind: 'gateFailed',
+      reasons: ['completion requires at least one evidence link'],
+    });
+    expect(mockCall).toHaveBeenCalledWith({
+      method: 'openhuman.agent_team_complete_task',
+      params: {
+        teamId: 'team-1',
+        taskId: 'task-1',
+        memberId: 'm1',
+        evidence: ['proof'],
+        requireEvidence: true,
+      },
+    });
+  });
+
+  it('throws when a required id is missing, without calling core', async () => {
+    await expect(
+      agentTeamApi.completeTask({ teamId: '', taskId: 't', memberId: 'm' })
+    ).rejects.toThrow('required');
+    expect(mockCall).not.toHaveBeenCalled();
+  });
+});
+
+describe('agentTeamApi.shutdownMember', () => {
+  it('unwraps { result } to the MemberShutdown', async () => {
+    const result = { member: { id: 'm1', memberStatus: 'stopped' }, releasedTaskIds: ['task-1'] };
+    mockCall.mockResolvedValueOnce({ result });
+    const outcome = await agentTeamApi.shutdownMember('team-1', 'm1');
+    expect(outcome).toBe(result);
+    expect(mockCall).toHaveBeenCalledWith({
+      method: 'openhuman.agent_team_shutdown_member',
+      params: { teamId: 'team-1', memberId: 'm1' },
+    });
+  });
+
+  it('throws when teamId or memberId is empty, without calling core', async () => {
+    await expect(agentTeamApi.shutdownMember('', 'm1')).rejects.toThrow('required');
+    await expect(agentTeamApi.shutdownMember('team-1', '')).rejects.toThrow('required');
+    expect(mockCall).not.toHaveBeenCalled();
+  });
+});
diff --git a/app/src/services/api/agentTeamApi.ts b/app/src/services/api/agentTeamApi.ts
index 6fe8aa94b..8ebaf657d 100644
--- a/app/src/services/api/agentTeamApi.ts
+++ b/app/src/services/api/agentTeamApi.ts
@@ -1,11 +1,13 @@
 /**
  * Frontend client for the durable agent-team coordination surface (#3374).
  *
- * Wraps the read paths of the `openhuman.agent_team_*` controller family that
- * landed with the durable team ledger (PR1, #3546): `agent_team_list`,
- * `agent_team_get`, and `agent_team_list_messages`. PR2 is a READ-ONLY surface
- * — creating teams, assigning/claiming tasks and posting messages is the
- * agents' job (and a later PR), so only the three read methods live here.
+ * Wraps the `openhuman.agent_team_*` controller family from the durable team
+ * ledger (PR1, #3546): the read paths `agent_team_list`, `agent_team_get`, and
+ * `agent_team_list_messages`, plus two lifecycle writes added with quality-gated
+ * completion — `agent_team_complete_task` and `agent_team_shutdown_member`.
+ * Creating teams, assigning and claiming tasks, and posting messages stay the
+ * agents' job (driven over the same controllers from the run loop), so those
+ * write methods are deliberately absent here.
  *
  * The Rust controllers serialize their row types with
  * `#[serde(rename_all = "camelCase")]`, so the wire payload is already camelCase
@@ -86,6 +88,24 @@ export interface TeamView {
   tasks: AgentTeamTask[];
 }
 
+/**
+ * Outcome of a completion attempt. Mirrors Rust `CompletionOutcome`, which is an
+ * internally-tagged enum on `kind`: `completed` flattens the resulting task onto
+ * the object; `gateFailed` carries the unmet-invariant reasons; the rest are
+ * bare tags.
+ */
+export type CompletionOutcome =
+  | ({ kind: 'completed' } & AgentTeamTask)
+  | { kind: 'gateFailed'; reasons: string[] }
+  | { kind: 'notClaimed' }
+  | { kind: 'unknownTask' };
+
+/** Result of stopping a member. Mirrors Rust `MemberShutdown`. */
+export interface MemberShutdown {
+  member: AgentTeamMember;
+  releasedTaskIds: string[];
+}
+
 /** Parsed payload of a `team_message` run event. Mirrors the Rust `json!` body. */
 export interface TeamMessagePayload {
   from: string;
@@ -194,4 +214,48 @@ export const agentTeamApi = {
     log('listMessages received=%d', messages.length);
     return messages;
   },
+
+  /**
+   * Complete a claimed task, gating its transition to `done`. The core checks
+   * the quality invariants (dependencies done, the completer is the claimant and
+   * any pre-assigned owner, evidence present when `requireEvidence`) and returns
+   * a {@link CompletionOutcome}: `completed`, `gateFailed` (with reasons),
+   * `notClaimed`, or `unknownTask`. Evidence links accumulate across retries.
+   */
+  completeTask: async (params: {
+    teamId: string;
+    taskId: string;
+    memberId: string;
+    evidence?: string[];
+    requireEvidence?: boolean;
+  }): Promise<CompletionOutcome> => {
+    const { teamId, taskId, memberId, evidence = [], requireEvidence = false } = params;
+    if (!teamId || !taskId || !memberId) {
+      throw new Error('agentTeamApi.completeTask: teamId, taskId and memberId are required');
+    }
+    log('completeTask teamId=%s taskId=%s requireEvidence=%o', teamId, taskId, requireEvidence);
+    const response = await callCoreRpc<{ result: CompletionOutcome }>({
+      method: 'openhuman.agent_team_complete_task',
+      params: { teamId, taskId, memberId, evidence, requireEvidence },
+    });
+    log('completeTask kind=%s', response.result.kind);
+    return response.result;
+  },
+
+  /**
+   * Stop a member and release any task it is actively working on back to `todo`.
+   * Returns the stopped member plus the ids that were released.
+   */
+  shutdownMember: async (teamId: string, memberId: string): Promise<MemberShutdown> => {
+    if (!teamId || !memberId) {
+      throw new Error('agentTeamApi.shutdownMember: teamId and memberId are required');
+    }
+    log('shutdownMember teamId=%s memberId=%s', teamId, memberId);
+    const response = await callCoreRpc<{ result: MemberShutdown }>({
+      method: 'openhuman.agent_team_shutdown_member',
+      params: { teamId, memberId },
+    });
+    log('shutdownMember released=%d', response.result.releasedTaskIds.length);
+    return response.result;
+  },
 };
diff --git a/src/openhuman/agent_orchestration/agent_teams/mod.rs b/src/openhuman/agent_orchestration/agent_teams/mod.rs
index dfe2a0629..5ef5fca43 100644
--- a/src/openhuman/agent_orchestration/agent_teams/mod.rs
+++ b/src/openhuman/agent_orchestration/agent_teams/mod.rs
@@ -8,11 +8,13 @@
 //! never in the main chat context — so a coordination session can be listed,
 //! inspected, and resumed.
 //!
-//! PR1 scope (this module today): the durable model + 8 read/write controllers
+//! Scope (this module today): the durable model + 10 read/write controllers
 //! (`create`, `list`, `get`, `assign_task`, `claim_task`, `message_member`,
-//! `list_messages`, `close`), the atomic compare-and-swap claim primitive, and
-//! dependency validation (self / unknown / cycle). Live agent execution
-//! (spawning workers, driving the run loop) and the UI are follow-up PRs.
+//! `list_messages`, `complete_task`, `shutdown_member`, `close`), the atomic
+//! compare-and-swap claim primitive, dependency validation (self / unknown /
+//! cycle), and quality-gated task completion (dependencies done, claimant owns
+//! the task, evidence present when required). Live agent execution (spawning
+//! workers, driving the run loop) and the message-send UI are a follow-up PR.
 //!
 //! Namespace note: `agent_team` is distinct from the existing `team` domain,
 //! which manages backend org/team membership.
@@ -22,11 +24,11 @@ mod schemas;
 pub mod types;
 
 pub use ops::{
-    assign_task, claim_task, close_team, create_team, get_team, list_messages, list_teams,
-    message_member, NewMember,
+    assign_task, claim_task, close_team, complete_task, create_team, get_team, list_messages,
+    list_teams, message_member, shutdown_member, NewMember,
 };
 pub use schemas::{
     all_controller_schemas as all_agent_team_controller_schemas,
     all_registered_controllers as all_agent_team_registered_controllers,
 };
-pub use types::{TeamError, TeamView};
+pub use types::{MemberShutdown, TeamError, TeamView};
diff --git a/src/openhuman/agent_orchestration/agent_teams/ops.rs b/src/openhuman/agent_orchestration/agent_teams/ops.rs
index 7a653241d..526e225a2 100644
--- a/src/openhuman/agent_orchestration/agent_teams/ops.rs
+++ b/src/openhuman/agent_orchestration/agent_teams/ops.rs
@@ -17,11 +17,11 @@ use crate::openhuman::config::Config;
 use crate::openhuman::session_db::run_ledger::{
     self, AgentTeam, AgentTeamListRequest, AgentTeamListResponse, AgentTeamMemberStatus,
     AgentTeamMemberUpsert, AgentTeamStatus, AgentTeamTask, AgentTeamTaskStatus,
-    AgentTeamTaskUpsert, AgentTeamUpsert, ClaimOutcome, RunEvent, RunEventAppend,
-    RunEventListRequest,
+    AgentTeamTaskUpsert, AgentTeamUpsert, ClaimOutcome, CompletionOutcome, RunEvent,
+    RunEventAppend, RunEventListRequest,
 };
 
-use super::types::{TeamError, TeamView};
+use super::types::{MemberShutdown, TeamError, TeamView};
 
 const LOG_PREFIX: &str = "[agent_team]";
 const TEAM_MESSAGE_EVENT: &str = "team_message";
@@ -287,6 +287,63 @@ pub fn close_team(config: &Config, team_id: &str, summary: Option<&str>) -> Resu
     Ok(team)
 }
 
+/// Complete a claimed task, gating its transition to `done`.
+///
+/// Validates the completing member belongs to the team, then delegates to the
+/// run-ledger completion CAS, which enforces the quality gate (dependencies
+/// done, claimant owns the task, evidence present when `require_evidence`) and
+/// only flips the task to `done` when every invariant holds.
+pub fn complete_task(
+    config: &Config,
+    team_id: &str,
+    task_id: &str,
+    member_id: &str,
+    evidence: &[String],
+    require_evidence: bool,
+) -> Result<CompletionOutcome> {
+    log::debug!(
+        "{LOG_PREFIX} complete_task.entry team={team_id} task={task_id} member={member_id}"
+    );
+    let members = run_ledger::list_agent_team_members(config, team_id)?;
+    if !members.iter().any(|m| m.id == member_id) {
+        return Err(anyhow!(TeamError::UnknownMember {
+            member_id: member_id.to_string(),
+        }));
+    }
+    let outcome = run_ledger::complete_agent_team_task(
+        config,
+        team_id,
+        task_id,
+        member_id,
+        evidence,
+        require_evidence,
+    )?;
+    log::debug!("{LOG_PREFIX} complete_task.exit team={team_id} task={task_id}");
+    Ok(outcome)
+}
+
+/// Stop a team member, releasing any task it was actively working on.
+///
+/// Unknown member ids surface as [`TeamError::UnknownMember`]; otherwise returns
+/// the stopped member plus the ids of tasks released back to `todo`.
+pub fn shutdown_member(config: &Config, team_id: &str, member_id: &str) -> Result<MemberShutdown> {
+    log::debug!("{LOG_PREFIX} shutdown_member.entry team={team_id} member={member_id}");
+    let (member, released_task_ids) =
+        run_ledger::shutdown_agent_team_member(config, team_id, member_id)?.ok_or_else(|| {
+            anyhow!(TeamError::UnknownMember {
+                member_id: member_id.to_string(),
+            })
+        })?;
+    log::debug!(
+        "{LOG_PREFIX} shutdown_member.exit team={team_id} member={member_id} released={}",
+        released_task_ids.len()
+    );
+    Ok(MemberShutdown {
+        member,
+        released_task_ids,
+    })
+}
+
 fn team_view(config: &Config, team_id: &str) -> Result<TeamView> {
     let team = run_ledger::get_agent_team(config, team_id)?
         .ok_or_else(|| anyhow!("team missing after creation: {team_id}"))?;
@@ -524,4 +581,229 @@ mod tests {
         assert_eq!(messages[0].payload["content"], "first");
         assert_eq!(messages[1].payload["content"], "second");
     }
+
+    /// Create a single-member team and return `(team_id, member_id)`.
+    fn solo_team(config: &Config, name: &str) -> (String, String) {
+        let view = create_team(
+            config,
+            "lead",
+            None,
+            None,
+            &[NewMember {
+                name: name.into(),
+                agent_id: None,
+            }],
+        )
+        .unwrap();
+        let member_id = view.members[0].id.clone();
+        (view.team.id, member_id)
+    }
+
+    #[test]
+    fn complete_task_gate_passes_and_marks_done() {
+        let dir = TempDir::new().unwrap();
+        let config = test_config(&dir);
+        let (team_id, alice) = solo_team(&config, "alice");
+
+        let task = assign_task(&config, &team_id, "ship it", None, None, &[]).unwrap();
+        let claim = claim_task(&config, &team_id, &task.id, &alice, "tok-1").unwrap();
+        assert!(matches!(claim, ClaimOutcome::Claimed(_)));
+
+        let outcome = complete_task(
+            &config,
+            &team_id,
+            &task.id,
+            &alice,
+            &["https://ci/run/1".to_string()],
+            true,
+        )
+        .unwrap();
+        match outcome {
+            CompletionOutcome::Completed(done) => {
+                assert_eq!(done.status, AgentTeamTaskStatus::Done);
+                assert_eq!(done.gate_status, "passed");
+                assert_eq!(done.gate_reason, None);
+                assert_eq!(done.evidence, vec!["https://ci/run/1".to_string()]);
+            }
+            other => panic!("expected Completed, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn complete_task_requires_evidence_then_recovers() {
+        let dir = TempDir::new().unwrap();
+        let config = test_config(&dir);
+        let (team_id, alice) = solo_team(&config, "alice");
+
+        let task = assign_task(&config, &team_id, "ship it", None, None, &[]).unwrap();
+        claim_task(&config, &team_id, &task.id, &alice, "tok-1").unwrap();
+
+        // No evidence + require_evidence → gate fails, task stays in progress.
+        let failed = complete_task(&config, &team_id, &task.id, &alice, &[], true).unwrap();
+        match failed {
+            CompletionOutcome::GateFailed { reasons } => {
+                assert!(
+                    reasons.iter().any(|r| r.contains("evidence")),
+                    "{reasons:?}"
+                );
+            }
+            other => panic!("expected GateFailed, got {other:?}"),
+        }
+        let mid = run_ledger::get_agent_team_task(&config, &task.id)
+            .unwrap()
+            .unwrap();
+        assert_eq!(mid.status, AgentTeamTaskStatus::InProgress);
+        assert_eq!(mid.gate_status, "failed");
+
+        // Retry with evidence → passes.
+        let ok = complete_task(
+            &config,
+            &team_id,
+            &task.id,
+            &alice,
+            &["proof".to_string()],
+            true,
+        )
+        .unwrap();
+        assert!(matches!(ok, CompletionOutcome::Completed(_)));
+    }
+
+    #[test]
+    fn complete_task_is_not_double_completable() {
+        let dir = TempDir::new().unwrap();
+        let config = test_config(&dir);
+        let (team_id, alice) = solo_team(&config, "alice");
+
+        let task = assign_task(&config, &team_id, "ship it", None, None, &[]).unwrap();
+        claim_task(&config, &team_id, &task.id, &alice, "tok-1").unwrap();
+
+        let first = complete_task(&config, &team_id, &task.id, &alice, &[], false).unwrap();
+        assert!(matches!(first, CompletionOutcome::Completed(_)));
+
+        // A task that is already `done` is no longer in progress, so a second
+        // completion is rejected (the `status = 'in_progress'` UPDATE guard makes
+        // the CAS airtight even under a concurrent double-complete).
+        let second = complete_task(&config, &team_id, &task.id, &alice, &[], false).unwrap();
+        assert_eq!(second, CompletionOutcome::NotClaimed);
+    }
+
+    #[test]
+    fn complete_task_rejects_non_claimant() {
+        let dir = TempDir::new().unwrap();
+        let config = test_config(&dir);
+        let view = create_team(
+            &config,
+            "lead",
+            None,
+            None,
+            &[
+                NewMember {
+                    name: "alice".into(),
+                    agent_id: None,
+                },
+                NewMember {
+                    name: "bob".into(),
+                    agent_id: None,
+                },
+            ],
+        )
+        .unwrap();
+        let team_id = view.team.id.clone();
+        let alice = view.members[0].id.clone();
+        let bob = view.members[1].id.clone();
+
+        let task = assign_task(&config, &team_id, "ship it", None, None, &[]).unwrap();
+        claim_task(&config, &team_id, &task.id, &alice, "tok-1").unwrap();
+
+        // Bob is a member but not the claimant → NotClaimed.
+        let outcome = complete_task(&config, &team_id, &task.id, &bob, &[], false).unwrap();
+        assert_eq!(outcome, CompletionOutcome::NotClaimed);
+
+        // Unknown member → typed error (not an outcome).
+        let err = complete_task(&config, &team_id, &task.id, "ghost", &[], false).unwrap_err();
+        assert_eq!(
+            team_err(err),
+            TeamError::UnknownMember {
+                member_id: "ghost".into()
+            }
+        );
+    }
+
+    #[test]
+    fn complete_task_owner_mismatch_fails_gate() {
+        let dir = TempDir::new().unwrap();
+        let config = test_config(&dir);
+        let view = create_team(
+            &config,
+            "lead",
+            None,
+            None,
+            &[
+                NewMember {
+                    name: "alice".into(),
+                    agent_id: None,
+                },
+                NewMember {
+                    name: "bob".into(),
+                    agent_id: None,
+                },
+            ],
+        )
+        .unwrap();
+        let team_id = view.team.id.clone();
+        let alice = view.members[0].id.clone();
+        let bob = view.members[1].id.clone();
+
+        // Task owned by bob, but alice claims + tries to complete.
+        let task = assign_task(&config, &team_id, "ship it", None, Some(&bob), &[]).unwrap();
+        claim_task(&config, &team_id, &task.id, &alice, "tok-1").unwrap();
+
+        let outcome = complete_task(&config, &team_id, &task.id, &alice, &[], false).unwrap();
+        match outcome {
+            CompletionOutcome::GateFailed { reasons } => {
+                assert!(
+                    reasons.iter().any(|r| r.contains("owned by")),
+                    "{reasons:?}"
+                );
+            }
+            other => panic!("expected GateFailed, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn shutdown_member_releases_in_progress_tasks() {
+        let dir = TempDir::new().unwrap();
+        let config = test_config(&dir);
+        let (team_id, alice) = solo_team(&config, "alice");
+
+        let task = assign_task(&config, &team_id, "ship it", None, None, &[]).unwrap();
+        claim_task(&config, &team_id, &task.id, &alice, "tok-1").unwrap();
+
+        let result = shutdown_member(&config, &team_id, &alice).unwrap();
+        assert_eq!(result.released_task_ids, vec![task.id.clone()]);
+        assert_eq!(result.member.member_status, AgentTeamMemberStatus::Stopped);
+
+        // Task is back to todo and unclaimed → another teammate could claim it.
+        let released = run_ledger::get_agent_team_task(&config, &task.id)
+            .unwrap()
+            .unwrap();
+        assert_eq!(released.status, AgentTeamTaskStatus::Todo);
+        assert_eq!(released.claimed_by_member_id, None);
+        assert_eq!(released.claim_token, None);
+    }
+
+    #[test]
+    fn shutdown_member_unknown_errors() {
+        let dir = TempDir::new().unwrap();
+        let config = test_config(&dir);
+        let (team_id, _alice) = solo_team(&config, "alice");
+
+        let err = shutdown_member(&config, &team_id, "ghost").unwrap_err();
+        assert_eq!(
+            team_err(err),
+            TeamError::UnknownMember {
+                member_id: "ghost".into()
+            }
+        );
+    }
 }
diff --git a/src/openhuman/agent_orchestration/agent_teams/schemas.rs b/src/openhuman/agent_orchestration/agent_teams/schemas.rs
index 9fa6fafb4..412f8ddcb 100644
--- a/src/openhuman/agent_orchestration/agent_teams/schemas.rs
+++ b/src/openhuman/agent_orchestration/agent_teams/schemas.rs
@@ -1,9 +1,10 @@
 //! Controller schemas + JSON-RPC dispatchers for durable agent-team
 //! coordination (#3374). Namespace `agent_team`.
 //!
-//! Surface (PR1): create a team with members, list/get teams, assign
-//! dependency-aware tasks, atomically claim a task, exchange teammate messages,
-//! list those messages, and close a team. Live agent execution is a follow-up.
+//! Surface: create a team with members, list/get teams, assign dependency-aware
+//! tasks, atomically claim a task, exchange + list teammate messages, complete a
+//! claimed task behind a quality gate, shut a member down (releasing its tasks),
+//! and close a team. Live agent execution is a follow-up.
 
 use serde_json::{Map, Value};
 
@@ -25,6 +26,8 @@ pub fn all_controller_schemas() -> Vec<ControllerSchema> {
         schema_for("agent_team_claim_task"),
         schema_for("agent_team_message_member"),
         schema_for("agent_team_list_messages"),
+        schema_for("agent_team_complete_task"),
+        schema_for("agent_team_shutdown_member"),
         schema_for("agent_team_close"),
     ]
 }
@@ -60,6 +63,14 @@ pub fn all_registered_controllers() -> Vec<RegisteredController> {
             schema: schema_for("agent_team_list_messages"),
             handler: handle_list_messages,
         },
+        RegisteredController {
+            schema: schema_for("agent_team_complete_task"),
+            handler: handle_complete_task,
+        },
+        RegisteredController {
+            schema: schema_for("agent_team_shutdown_member"),
+            handler: handle_shutdown_member,
+        },
         RegisteredController {
             schema: schema_for("agent_team_close"),
             handler: handle_close,
@@ -157,6 +168,45 @@ fn schema_for(function: &str) -> ControllerSchema {
             ],
             outputs: vec![json_output("messages", "Array of message events.")],
         },
+        "agent_team_complete_task" => ControllerSchema {
+            namespace: "agent_team",
+            function: "complete_task",
+            description:
+                "Complete a claimed task, gating its transition to done behind quality checks.",
+            inputs: vec![
+                required_str("teamId", "Team id."),
+                required_str("taskId", "Task id to complete."),
+                required_str(
+                    "memberId",
+                    "Member completing the task (must be the claimant).",
+                ),
+                json_input(
+                    "evidence",
+                    "Array of evidence links to attach on completion.",
+                ),
+                optional_bool(
+                    "requireEvidence",
+                    "Require at least one evidence link to pass the gate (default false).",
+                ),
+            ],
+            outputs: vec![json_output(
+                "result",
+                "CompletionOutcome: completed | gateFailed | notClaimed | unknownTask.",
+            )],
+        },
+        "agent_team_shutdown_member" => ControllerSchema {
+            namespace: "agent_team",
+            function: "shutdown_member",
+            description: "Stop a team member and release any task it is actively working on.",
+            inputs: vec![
+                required_str("teamId", "Team id."),
+                required_str("memberId", "Member id to stop."),
+            ],
+            outputs: vec![json_output(
+                "result",
+                "MemberShutdown: the stopped member and releasedTaskIds.",
+            )],
+        },
         "agent_team_close" => ControllerSchema {
             namespace: "agent_team",
             function: "close",
@@ -324,6 +374,52 @@ fn handle_list_messages(params: Map<String, Value>) -> ControllerFuture {
     })
 }
 
+fn handle_complete_task(params: Map<String, Value>) -> ControllerFuture {
+    Box::pin(async move {
+        let cid = new_correlation_id();
+        log::debug!(target: "agent_team_rpc", "[agent_team_rpc][{cid}] complete_task.entry");
+        let config = config_rpc::load_config_with_timeout().await.inspect_err(|err| {
+            log::warn!(target: "agent_team_rpc", "[agent_team_rpc][{cid}] complete_task.config_failed err={err}");
+        })?;
+        let team_id = require_str(&params, "teamId")?;
+        let task_id = require_str(&params, "taskId")?;
+        let member_id = require_str(&params, "memberId")?;
+        let evidence = opt_str_array(&params, "evidence");
+        let require_evidence = params
+            .get("requireEvidence")
+            .and_then(Value::as_bool)
+            .unwrap_or(false);
+        log::debug!(target: "agent_team_rpc", "[agent_team_rpc][{cid}] complete_task.parsed team={team_id} task={task_id} evidence={} requireEvidence={require_evidence}", evidence.len());
+        let outcome = ops::complete_task(
+            &config,
+            &team_id,
+            &task_id,
+            &member_id,
+            &evidence,
+            require_evidence,
+        )
+        .map_err(|e| log_err(&cid, "complete_task", e))?;
+        log::debug!(target: "agent_team_rpc", "[agent_team_rpc][{cid}] complete_task.success team={team_id} task={task_id}");
+        to_json(serde_json::json!({ "result": outcome }))
+    })
+}
+
+fn handle_shutdown_member(params: Map<String, Value>) -> ControllerFuture {
+    Box::pin(async move {
+        let cid = new_correlation_id();
+        log::debug!(target: "agent_team_rpc", "[agent_team_rpc][{cid}] shutdown_member.entry");
+        let config = config_rpc::load_config_with_timeout().await.inspect_err(|err| {
+            log::warn!(target: "agent_team_rpc", "[agent_team_rpc][{cid}] shutdown_member.config_failed err={err}");
+        })?;
+        let team_id = require_str(&params, "teamId")?;
+        let member_id = require_str(&params, "memberId")?;
+        let result = ops::shutdown_member(&config, &team_id, &member_id)
+            .map_err(|e| log_err(&cid, "shutdown_member", e))?;
+        log::debug!(target: "agent_team_rpc", "[agent_team_rpc][{cid}] shutdown_member.success team={team_id} member={member_id} released={}", result.released_task_ids.len());
+        to_json(serde_json::json!({ "result": result }))
+    })
+}
+
 fn handle_close(params: Map<String, Value>) -> ControllerFuture {
     Box::pin(async move {
         let cid = new_correlation_id();
@@ -438,6 +534,15 @@ fn optional_u64(name: &'static str, comment: &'static str) -> FieldSchema {
     }
 }
 
+fn optional_bool(name: &'static str, comment: &'static str) -> FieldSchema {
+    FieldSchema {
+        name,
+        ty: TypeSchema::Option(Box::new(TypeSchema::Bool)),
+        comment,
+        required: false,
+    }
+}
+
 fn json_input(name: &'static str, comment: &'static str) -> FieldSchema {
     FieldSchema {
         name,
@@ -465,8 +570,16 @@ mod tests {
         let schemas = all_controller_schemas();
         let registered = all_registered_controllers();
         assert_eq!(schemas.len(), registered.len());
-        assert_eq!(schemas.len(), 8);
+        assert_eq!(schemas.len(), 10);
         assert!(schemas.iter().all(|s| s.namespace == "agent_team"));
         assert_eq!(schema_for("agent_team_claim_task").function, "claim_task");
+        assert_eq!(
+            schema_for("agent_team_complete_task").function,
+            "complete_task"
+        );
+        assert_eq!(
+            schema_for("agent_team_shutdown_member").function,
+            "shutdown_member"
+        );
     }
 }
diff --git a/src/openhuman/agent_orchestration/agent_teams/types.rs b/src/openhuman/agent_orchestration/agent_teams/types.rs
index e750a16ac..5b697c795 100644
--- a/src/openhuman/agent_orchestration/agent_teams/types.rs
+++ b/src/openhuman/agent_orchestration/agent_teams/types.rs
@@ -18,6 +18,15 @@ pub struct TeamView {
     pub tasks: Vec<AgentTeamTask>,
 }
 
+/// Result of shutting a member down: the stopped member plus the ids of any
+/// `in_progress` tasks that were released back to `todo` for another teammate.
+#[derive(Debug, Clone, PartialEq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct MemberShutdown {
+    pub member: AgentTeamMember,
+    pub released_task_ids: Vec<String>,
+}
+
 /// A validation / coordination problem surfaced by the agent-team ops.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize)]
 #[serde(rename_all = "camelCase", tag = "kind", content = "detail")]
diff --git a/src/openhuman/session_db/run_ledger/mod.rs b/src/openhuman/session_db/run_ledger/mod.rs
index a65cb60d6..f11034ce9 100644
--- a/src/openhuman/session_db/run_ledger/mod.rs
+++ b/src/openhuman/session_db/run_ledger/mod.rs
@@ -10,18 +10,18 @@ pub mod store;
 pub mod types;
 
 pub use ops::{
-    append_run_event, claim_agent_team_task, get_agent_run, get_agent_team, get_agent_team_member,
-    get_agent_team_task, get_workflow_run, list_agent_runs, list_agent_team_members,
-    list_agent_team_tasks, list_agent_teams, list_recent_run_events, list_workflow_runs,
-    upsert_agent_run, upsert_agent_team, upsert_agent_team_member, upsert_agent_team_task,
-    upsert_run_telemetry, upsert_workflow_run,
+    append_run_event, claim_agent_team_task, complete_agent_team_task, get_agent_run,
+    get_agent_team, get_agent_team_member, get_agent_team_task, get_workflow_run, list_agent_runs,
+    list_agent_team_members, list_agent_team_tasks, list_agent_teams, list_recent_run_events,
+    list_workflow_runs, shutdown_agent_team_member, upsert_agent_run, upsert_agent_team,
+    upsert_agent_team_member, upsert_agent_team_task, upsert_run_telemetry, upsert_workflow_run,
 };
 pub use types::{
     AgentRun, AgentRunKind, AgentRunListRequest, AgentRunListResponse, AgentRunStatus,
     AgentRunUpsert, AgentTeam, AgentTeamListRequest, AgentTeamListResponse, AgentTeamMember,
     AgentTeamMemberStatus, AgentTeamMemberUpsert, AgentTeamStatus, AgentTeamTask,
-    AgentTeamTaskStatus, AgentTeamTaskUpsert, AgentTeamUpsert, ClaimOutcome, RunEvent,
-    RunEventAppend, RunEventListRequest, RunEventListResponse, RunTelemetry, RunTelemetryUpsert,
-    WorkflowRun, WorkflowRunListRequest, WorkflowRunListResponse, WorkflowRunStatus,
-    WorkflowRunUpsert,
+    AgentTeamTaskStatus, AgentTeamTaskUpsert, AgentTeamUpsert, ClaimOutcome, CompletionOutcome,
+    RunEvent, RunEventAppend, RunEventListRequest, RunEventListResponse, RunTelemetry,
+    RunTelemetryUpsert, WorkflowRun, WorkflowRunListRequest, WorkflowRunListResponse,
+    WorkflowRunStatus, WorkflowRunUpsert,
 };
diff --git a/src/openhuman/session_db/run_ledger/ops.rs b/src/openhuman/session_db/run_ledger/ops.rs
index 675d86f1a..c8719af66 100644
--- a/src/openhuman/session_db/run_ledger/ops.rs
+++ b/src/openhuman/session_db/run_ledger/ops.rs
@@ -10,9 +10,9 @@ use super::types::{
     AgentRun, AgentRunListRequest, AgentRunListResponse, AgentRunStatus, AgentRunUpsert, AgentTeam,
     AgentTeamListRequest, AgentTeamListResponse, AgentTeamMember, AgentTeamMemberStatus,
     AgentTeamMemberUpsert, AgentTeamStatus, AgentTeamTask, AgentTeamTaskStatus,
-    AgentTeamTaskUpsert, AgentTeamUpsert, ClaimOutcome, RunEvent, RunEventAppend,
-    RunEventListRequest, RunEventListResponse, RunTelemetry, RunTelemetryUpsert, WorkflowRun,
-    WorkflowRunListRequest, WorkflowRunListResponse, WorkflowRunUpsert,
+    AgentTeamTaskUpsert, AgentTeamUpsert, ClaimOutcome, CompletionOutcome, RunEvent,
+    RunEventAppend, RunEventListRequest, RunEventListResponse, RunTelemetry, RunTelemetryUpsert,
+    WorkflowRun, WorkflowRunListRequest, WorkflowRunListResponse, WorkflowRunUpsert,
 };
 
 const LOG_PREFIX: &str = "[session_db:run_ledger]";
@@ -857,6 +857,238 @@ pub fn claim_agent_team_task(
     Ok(outcome)
 }
 
+/// Quality-gate a task's completion and, on pass, transition it to `done`.
+///
+/// Runs inside a single transaction so the gate evaluation and the status flip
+/// observe one consistent snapshot:
+/// 1. Resolve the task by `(id, team_id)`; absent → [`CompletionOutcome::UnknownTask`].
+/// 2. The completer must be the current claimant and the task must be
+///    `in_progress`; otherwise [`CompletionOutcome::NotClaimed`].
+/// 3. Evaluate the quality gate (every dependency `done`, claimant matches any
+///    pre-assigned owner, evidence present when `require_evidence`). Any unmet
+///    invariant records `gate_status = "failed"` + the joined reasons and leaves
+///    the task `in_progress` → [`CompletionOutcome::GateFailed`].
+/// 4. On pass, merge `evidence`, set `status = "done"`, `gate_status = "passed"`,
+///    clear `gate_reason`, re-fetch → [`CompletionOutcome::Completed`].
+pub fn complete_agent_team_task(
+    config: &Config,
+    team_id: &str,
+    task_id: &str,
+    member_id: &str,
+    evidence: &[String],
+    require_evidence: bool,
+) -> Result<CompletionOutcome> {
+    log::debug!(
+        "{LOG_PREFIX} complete_agent_team_task.entry team={team_id} task={task_id} member={member_id}"
+    );
+    let outcome = crate::openhuman::session_db::store::with_connection(config, |conn| {
+        init_run_ledger_schema(conn)?;
+
+        // 1. Resolve the task within this team.
+        let task = match get_agent_team_task_inner(conn, task_id)? {
+            Some(task) if task.team_id == team_id => task,
+            _ => {
+                log::debug!(
+                    "{LOG_PREFIX} complete_agent_team_task.unknown team={team_id} task={task_id}"
+                );
+                return Ok(CompletionOutcome::UnknownTask);
+            }
+        };
+
+        // 2. Only the current claimant may complete, and only while in progress.
+        let is_claimant = task.claimed_by_member_id.as_deref() == Some(member_id);
+        let in_progress = task.status == AgentTeamTaskStatus::InProgress;
+        if !is_claimant || !in_progress {
+            log::debug!(
+                "{LOG_PREFIX} complete_agent_team_task.not_claimed team={team_id} task={task_id} claimant={is_claimant} in_progress={in_progress}"
+            );
+            return Ok(CompletionOutcome::NotClaimed);
+        }
+
+        // Merge prior evidence with the newly-supplied links (de-duplicated,
+        // order-preserving) so a retry that adds evidence accumulates it.
+        let mut merged_evidence = task.evidence.clone();
+        for link in evidence {
+            if !merged_evidence.iter().any(|e| e == link) {
+                merged_evidence.push(link.clone());
+            }
+        }
+
+        // 3. Quality gate.
+        let reasons =
+            evaluate_completion_gate(conn, team_id, &task, &merged_evidence, require_evidence)?;
+        let now = Utc::now();
+        if !reasons.is_empty() {
+            let joined = reasons.join("; ");
+            conn.execute(
+                "UPDATE agent_team_tasks
+                 SET gate_status = 'failed', gate_reason = ?1, updated_at = ?2
+                 WHERE id = ?3 AND team_id = ?4",
+                params![joined, now.to_rfc3339(), task_id, team_id],
+            )
+            .context("record failed completion gate")?;
+            log::debug!(
+                "{LOG_PREFIX} complete_agent_team_task.gate_failed team={team_id} task={task_id} reasons={}",
+                reasons.len()
+            );
+            return Ok(CompletionOutcome::GateFailed { reasons });
+        }
+
+        // 4. Gate passed — flip to done. The WHERE clause is the real CAS: the
+        // `claimed_by_member_id` guard stops a concurrent shutdown/unclaim from
+        // completing a task it no longer holds, and the `status = 'in_progress'`
+        // guard stops a concurrent double-complete by the same member (the
+        // snapshot check above is a read, not part of the swap — only one of two
+        // racing UPDATEs flips `in_progress -> done`).
+        let evidence_json =
+            serde_json::to_string(&merged_evidence).context("serialize completion evidence")?;
+        let rows_affected = conn
+            .execute(
+                "UPDATE agent_team_tasks
+                 SET status = 'done', gate_status = 'passed', gate_reason = NULL,
+                     evidence_json = ?1, updated_at = ?2
+                 WHERE id = ?3 AND team_id = ?4 AND claimed_by_member_id = ?5
+                   AND status = 'in_progress'",
+                params![evidence_json, now.to_rfc3339(), task_id, team_id, member_id],
+            )
+            .context("complete agent team task")?;
+        if rows_affected == 0 {
+            log::debug!(
+                "{LOG_PREFIX} complete_agent_team_task.lost_claim team={team_id} task={task_id}"
+            );
+            return Ok(CompletionOutcome::NotClaimed);
+        }
+
+        let done = get_agent_team_task_inner(conn, task_id)?
+            .context("completed task missing after update")?;
+        Ok(CompletionOutcome::Completed(Box::new(done)))
+    })?;
+    log::debug!(
+        "{LOG_PREFIX} complete_agent_team_task.exit team={team_id} task={task_id} outcome={}",
+        match &outcome {
+            CompletionOutcome::Completed(_) => "completed",
+            CompletionOutcome::GateFailed { .. } => "gate_failed",
+            CompletionOutcome::NotClaimed => "not_claimed",
+            CompletionOutcome::UnknownTask => "unknown",
+        }
+    );
+    Ok(outcome)
+}
+
+/// Evaluate the quality-gate invariants for a completing task. Returns one
+/// human-readable reason per unmet invariant (empty = gate passes).
+fn evaluate_completion_gate(
+    conn: &Connection,
+    team_id: &str,
+    task: &AgentTeamTask,
+    merged_evidence: &[String],
+    require_evidence: bool,
+) -> Result<Vec<String>> {
+    let mut reasons = Vec::new();
+
+    // Every dependency must still be `done` (defends against a dependency that
+    // regressed after this task was claimed).
+    for dep_id in &task.depends_on {
+        let dep_status: Option<String> = conn
+            .query_row(
+                "SELECT status FROM agent_team_tasks WHERE id = ?1 AND team_id = ?2",
+                params![dep_id, team_id],
+                |row| row.get(0),
+            )
+            .optional()?;
+        if dep_status.as_deref() != Some(AgentTeamTaskStatus::Done.as_str()) {
+            reasons.push(format!("dependency {dep_id} is not done"));
+        }
+    }
+
+    // No overlapping ownership: a pre-assigned owner must be the one completing.
+    if let Some(owner) = &task.owner_member_id {
+        if Some(owner.as_str()) != task.claimed_by_member_id.as_deref() {
+            reasons.push(format!(
+                "task is owned by {owner} but claimed by {}",
+                task.claimed_by_member_id.as_deref().unwrap_or("nobody")
+            ));
+        }
+    }
+
+    // Evidence gate.
+    if require_evidence && merged_evidence.is_empty() {
+        reasons.push("completion requires at least one evidence link".to_string());
+    }
+
+    Ok(reasons)
+}
+
+/// Stop a team member and release any task it is actively working on.
+///
+/// In one transaction: unclaim the member's `in_progress` tasks back to `todo`
+/// (clearing claimant + token so another teammate can pick them up), then mark
+/// the member `stopped` and clear its `current_task_id`. Returns the updated
+/// member plus the ids of the tasks that were released, or `None` if the member
+/// is not part of the team.
+pub fn shutdown_agent_team_member(
+    config: &Config,
+    team_id: &str,
+    member_id: &str,
+) -> Result<Option<(AgentTeamMember, Vec<String>)>> {
+    log::debug!("{LOG_PREFIX} shutdown_agent_team_member.entry team={team_id} member={member_id}");
+    let result = crate::openhuman::session_db::store::with_connection(config, |conn| {
+        init_run_ledger_schema(conn)?;
+
+        // Existence + team-membership check only; the row is intentionally not
+        // reused — the caller-facing member is re-read after the UPDATEs below so
+        // it reflects the stopped state.
+        match get_agent_team_member_inner(conn, member_id)? {
+            Some(found) if found.team_id == team_id => {}
+            _ => {
+                log::debug!(
+                    "{LOG_PREFIX} shutdown_agent_team_member.unknown team={team_id} member={member_id}"
+                );
+                return Ok(None);
+            }
+        }
+
+        // Collect the ids first so the caller can report exactly what was freed.
+        let released: Vec<String> = {
+            let mut stmt = conn.prepare(
+                "SELECT id FROM agent_team_tasks
+                 WHERE team_id = ?1 AND claimed_by_member_id = ?2 AND status = 'in_progress'",
+            )?;
+            let ids = stmt.query_map(params![team_id, member_id], |row| row.get::<_, String>(0))?;
+            let mut out = Vec::new();
+            for id in ids {
+                out.push(id?);
+            }
+            out
+        };
+
+        let now = Utc::now();
+        conn.execute(
+            "UPDATE agent_team_tasks
+             SET claimed_by_member_id = NULL, claim_token = NULL, status = 'todo', updated_at = ?1
+             WHERE team_id = ?2 AND claimed_by_member_id = ?3 AND status = 'in_progress'",
+            params![now.to_rfc3339(), team_id, member_id],
+        )
+        .context("release tasks on member shutdown")?;
+        conn.execute(
+            "UPDATE agent_team_members
+             SET member_status = 'stopped', current_task_id = NULL, updated_at = ?1
+             WHERE id = ?2 AND team_id = ?3",
+            params![now.to_rfc3339(), member_id, team_id],
+        )
+        .context("stop agent team member")?;
+
+        let member = get_agent_team_member_inner(conn, member_id)?
+            .context("member missing after shutdown")?;
+        Ok(Some((member, released)))
+    })?;
+    log::debug!(
+        "{LOG_PREFIX} shutdown_agent_team_member.exit team={team_id} member={member_id} released={}",
+        result.as_ref().map(|(_, r)| r.len()).unwrap_or(0)
+    );
+    Ok(result)
+}
+
 fn get_agent_team_inner(conn: &Connection, id: &str) -> Result<Option<AgentTeam>> {
     let mut stmt = conn.prepare(
         "SELECT id, parent_thread_id, lead_agent_id, status, summary,
diff --git a/src/openhuman/session_db/run_ledger/types.rs b/src/openhuman/session_db/run_ledger/types.rs
index 8b73375b3..1f093e0b2 100644
--- a/src/openhuman/session_db/run_ledger/types.rs
+++ b/src/openhuman/session_db/run_ledger/types.rs
@@ -524,3 +524,24 @@ pub enum ClaimOutcome {
     /// No task matched the given team + task id.
     UnknownTask,
 }
+
+/// Outcome of a completion attempt on a team task.
+///
+/// Completion gates a task's transition to `done` behind quality invariants
+/// (dependencies done, claimer owns the task, evidence present when required).
+/// A failed gate leaves the task `in_progress` with `gate_status = "failed"`
+/// and the reasons recorded, so a teammate can fix and retry.
+#[derive(Debug, Clone, PartialEq, Serialize)]
+#[serde(rename_all = "camelCase", tag = "kind")]
+pub enum CompletionOutcome {
+    /// The task passed its quality gate and is now `done`. Boxed to keep the
+    /// enum small (the task payload dwarfs the other variants).
+    Completed(Box<AgentTeamTask>),
+    /// One or more quality-gate invariants failed; carries human-readable
+    /// reasons for each unmet invariant.
+    GateFailed { reasons: Vec<String> },
+    /// The task is not claimed by the completing member, or is not in progress.
+    NotClaimed,
+    /// No task matched the given team + task id.
+    UnknownTask,
+}
diff --git a/tests/json_rpc_e2e.rs b/tests/json_rpc_e2e.rs
index b3053cbb7..83a1ea2de 100644
--- a/tests/json_rpc_e2e.rs
+++ b/tests/json_rpc_e2e.rs
@@ -3380,6 +3380,82 @@ async fn json_rpc_agent_team_coordination_roundtrip() {
         Some("claimed")
     );
 
+    // Complete B with no evidence but requireEvidence → quality gate fails.
+    let complete_b_blocked = post_json_rpc(
+        &rpc_base,
+        9360,
+        "openhuman.agent_team_complete_task",
+        json!({
+            "teamId": team_id,
+            "taskId": task_b_id,
+            "memberId": bob_id,
+            "evidence": [],
+            "requireEvidence": true
+        }),
+    )
+    .await;
+    let complete_b_blocked_outer =
+        assert_no_jsonrpc_error(&complete_b_blocked, "agent_team_complete_task B gate-fail");
+    assert_eq!(
+        complete_b_blocked_outer
+            .get("result")
+            .and_then(|r| r.get("kind"))
+            .and_then(serde_json::Value::as_str),
+        Some("gateFailed")
+    );
+
+    // Complete B again with evidence → passes the gate, task is now done.
+    let complete_b_ok = post_json_rpc(
+        &rpc_base,
+        9361,
+        "openhuman.agent_team_complete_task",
+        json!({
+            "teamId": team_id,
+            "taskId": task_b_id,
+            "memberId": bob_id,
+            "evidence": ["https://ci/run/42"],
+            "requireEvidence": true
+        }),
+    )
+    .await;
+    let complete_b_ok_outer =
+        assert_no_jsonrpc_error(&complete_b_ok, "agent_team_complete_task B done");
+    assert_eq!(
+        complete_b_ok_outer
+            .get("result")
+            .and_then(|r| r.get("kind"))
+            .and_then(serde_json::Value::as_str),
+        Some("completed")
+    );
+
+    // Shut alice down → member stopped (her task A is already done, so nothing
+    // is released back to the queue).
+    let shutdown_alice = post_json_rpc(
+        &rpc_base,
+        9362,
+        "openhuman.agent_team_shutdown_member",
+        json!({ "teamId": team_id, "memberId": alice_id }),
+    )
+    .await;
+    let shutdown_alice_outer =
+        assert_no_jsonrpc_error(&shutdown_alice, "agent_team_shutdown_member alice");
+    assert_eq!(
+        shutdown_alice_outer
+            .get("result")
+            .and_then(|r| r.get("member"))
+            .and_then(|m| m.get("memberStatus"))
+            .and_then(serde_json::Value::as_str),
+        Some("stopped")
+    );
+    assert_eq!(
+        shutdown_alice_outer
+            .get("result")
+            .and_then(|r| r.get("releasedTaskIds"))
+            .and_then(serde_json::Value::as_array)
+            .map(|ids| ids.len()),
+        Some(0)
+    );
+
     // Message bob from alice, then list messages.
     let message = post_json_rpc(
         &rpc_base,