zed-industries/zed · error · LoadError

Loading sessions is not supported by this agent.

Error message

Loading sessions is not supported by this agent.

What it means

Capability sentinel returned by the ACP connection's load_session when the connected agent server did not advertise the load_session capability in its initialize response. The request is rejected up front with a ready error task instead of sending an RPC the server cannot handle; the faulting input is any load_session call against this server.

Source

Thrown at crates/agent_servers/src/acp.rs:1742

    }

    fn supports_session_additional_directories(&self) -> bool {
        self.agent_capabilities
            .session_capabilities
            .additional_directories
            .is_some()
    }

    fn load_session(
        self: Rc<Self>,
        session_id: acp::SessionId,
        project: Entity<Project>,
        work_dirs: PathList,
        title: Option<SharedString>,
        cx: &mut App,
    ) -> Task<Result<Entity<AcpThread>>> {
        if !self.agent_capabilities.load_session {
            return Task::ready(Err(anyhow!(LoadError::Other(
                "Loading sessions is not supported by this agent.".into()
            ))));
        }

        let mcp_servers = mcp_servers_for_project(&project, cx);
        self.open_or_create_session(
            session_id,
            project,
            work_dirs,
            title,
            move |connection, session_id, directories| {
                Box::pin(async move {
                    let response = connection
                        .send_request(
                            directories.into_load_session_request(session_id.clone(), mcp_servers),
                        )
                        .block_task()
                        .await

View on GitHub (pinned to 9d272b0363)

Solutions

1. Use resume_session instead if the agent supports resuming without history
2. Start a new session rather than loading a previous one
3. Upgrade or switch to an agent implementation that advertises load_session support

When it happens

Trigger: Thrown at crates/agent_servers/src/acp.rs:1738 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@9d272b0363 (2026-08-20). Data as JSON: /api/errors/52ff3ff314e95b8a. Report an issue: GitHub.