diff --git a/Cargo.lock b/Cargo.lock
index ec96a93..7a6a856 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -87,6 +87,15 @@ dependencies = [
  "terminal_size",
 ]
 
+[[package]]
+name = "clap_complete"
+version = "4.6.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "037e2a1a92236d0aff7e845093f64661d6df4c02c9fcc61a60e9e1d736fa392f"
+dependencies = [
+ "clap",
+]
+
 [[package]]
 name = "clap_derive"
 version = "4.6.7"
@@ -111,6 +120,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "clap",
+ "clap_complete",
  "serde",
  "serde_json",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 451d81b..e09fa70 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,7 @@ path = "src/main.rs"
 [dependencies]
 anyhow = "1"
 clap = { version = "4", features = ["derive", "wrap_help"] }
+clap_complete = "4.5.67"
 serde = { version = "1", features = ["derive"] }
 serde_json = { version = "1", features = ["preserve_order"] }
 
diff --git a/README.md b/README.md
index d8064a3..9d65eab 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,8 @@ which of them the `claude` command runs as, and every account gets a Headroom
 proxy of its own, reachable under a name that does not change.
 
 ```sh
-claude-account setup            # wrapper, a proxy per account, the router
+claude-account setup            # wrapper, a proxy per account, the router, completions
+claude-account add kunde        # another account: profile, port, workspace, proxy
 claude-account switch work      # `claude` runs as the work account from now on
 claude-account status           # everything, and everything that is wrong
 ```
@@ -35,6 +36,12 @@ started deliberately in another profile -- a jail does this -- stays where it
 was put. Sessions that are already open are never disturbed by a switch; each
 keeps the profile it started with.
 
+One thing beats the wrapper and should not: an `alias claude=...` or a shell
+function of that name, which is found before anything in the `PATH` and, where
+it sets `CLAUDE_CONFIG_DIR` itself, makes every switch look ignored. `status`
+reads the startup files of bash, zsh and fish and names the file and the line,
+because nothing else in the report would show why the account never changes.
+
 ## A proxy per account
 
 A Headroom proxy keeps what it sees: a cache, a retrieval store and logs, all
@@ -45,12 +52,23 @@ written from one systemd template:
 
 | Address | What |
 | --- | --- |
-| `headroom.localhost` | the proxy of the account that is active right now |
-| `<account>.headroom.localhost` | one account's proxy, active or not |
+| `<account>.headroom.localhost` | the proxy of that account, active or not |
 | `<jail>.headroom.localhost` | the proxy a jail started for one session |
+| `headroom.localhost` | the proxy of the account that is active right now |
+| `headroom.localhost/names` | everything that resolves, and `?port=` for one name |
 
-The bare name follows the switch. That is the whole point of it: one address in
-a bookmark, always showing the account being worked in.
+Every account has its own name, so two accounts in use at the same time --
+one in each terminal -- never share an address. The bare domain follows the
+switch, for a bookmark that should show whichever account is being worked in,
+but nothing prints it: an address printed in one session would open the other
+account's proxy after a switch.
+
+A jail called like an account does not get the name; the account keeps it, and
+`status` points the jail out with the command that renames it. Programs that
+want the name of a port ask `headroom.localhost/names?port=8791`, which answers
+with the address as plain text, or 404 where the port has no name. That is how
+the `enqs-jail` and `enqs-info` plugins find it, so the rules of who gets which
+name live here alone.
 
 Jails keep their own names. They are published as run files by the `enqs-jail`
 plugin, and the router here reads the same directory in the same format, so a
@@ -67,12 +85,49 @@ workspaces over unchanged.
 | `doctor` | the same, and a non-zero exit when something is wrong |
 | `list`, `current`, `dir`, `env`, `url` | the small answers, for scripts |
 | `switch <account>` | make an account the one `claude` runs as |
-| `setup` | wrapper, proxies and router in one go |
+| `add <name>` | register an account: profile, port, workspace, proxy, all at once |
+| `remove <account>` | forget one; its profile directory stays |
+| `completions [shell]` | print a completion script, or `--install` it |
+| `setup` | wrapper, proxies, router and completions in one go |
 | `adopt` | take over services that were written by hand |
 | `shim install \| uninstall` | the `claude` wrapper |
 | `headroom install \| start \| stop \| restart \| port \| logs` | one account's proxy |
 | `router serve \| install \| uninstall \| port \| list` | the name router |
 
+## Adding an account
+
+```sh
+claude-account add kunde                 # ~/.claude-kunde, the next free port
+claude-account add kunde --dir ~/elsewhere --port 8795
+claude-account add kunde --switch        # and run as it straight away
+```
+
+`add` does everything an account needs rather than half of it: it creates the
+profile directory, reserves a port, gives the account a workspace of its own,
+writes and starts its proxy service, and points the profile's `settings.json`
+at that proxy. A login is the one thing left, because only a browser can do it:
+`claude-account switch kunde && claude /login`.
+
+`remove` is the counterpart and undoes the registration alone. The profile
+directory and the proxy workspace stay where they are -- they hold a login,
+projects and memories -- so a profile that still has credentials keeps showing
+up in `list`, found rather than configured.
+
+## Completions
+
+```sh
+claude-account completions --install     # every shell on this machine
+claude-account completions fish          # or print one
+```
+
+`setup` installs them as well. The subcommands come from the parser, so they
+cannot drift; the account names are not written into the file but asked for
+when Tab is pressed (`claude-account list --names`), so an account added a
+minute ago completes without regenerating anything. Files go to
+`~/.config/fish/completions`, `~/.local/share/bash-completion/completions` and
+`~/.local/share/zsh/site-functions` -- the last one has to be in the `fpath`
+before `compinit`.
+
 ## Configuration
 
 `~/.config/claude-account/config.json`. Everything in it has a default derived
diff --git a/src/account.rs b/src/account.rs
index 63c2ce2..1e8f28e 100644
--- a/src/account.rs
+++ b/src/account.rs
@@ -24,7 +24,8 @@ pub const DEFAULT_NAME: &str = "personal";
 
 #[derive(Debug, Clone)]
 pub struct Account {
-    /// The name on the command line and in `<name>.headroom.localhost`.
+    /// The name on the command line. An account has no name under the domain:
+    /// the bare one belongs to whichever account is active.
     pub name: String,
     /// The directory `CLAUDE_CONFIG_DIR` is pointed at.
     pub dir: PathBuf,
@@ -175,7 +176,7 @@ pub fn find(config: &Config, name: &str) -> Result<Account> {
     let wanted = router::label(name);
     all(config)
         .into_iter()
-        .find(|account| account.name == wanted)
+        .find(|account| router::label(&account.name) == wanted)
         .ok_or_else(|| anyhow!("there is no account called {name}. Run `claude-account list`."))
 }
 
@@ -215,6 +216,65 @@ pub fn switch(config: &mut Config, name: &str) -> Result<Account> {
     Ok(account)
 }
 
+/// Register an account: a new profile directory, or one this machine already
+/// holds that discovery would not have found.
+///
+/// The directory is created empty when it does not exist. An empty profile is
+/// a working one -- Claude Code fills it on the first run and `/login` puts a
+/// credential in it -- so nothing is copied from another account, which would
+/// be the one way to end up with two accounts sharing a login again.
+pub fn add(config: &mut Config, name: &str, dir: Option<PathBuf>, port: Option<u16>) -> Result<Account> {
+    let name = router::label(name);
+    if name.is_empty() {
+        return Err(anyhow!("an account needs a name of letters, digits or hyphens"));
+    }
+    if let Some(existing) = all(config).into_iter().find(|account| account.name == name) {
+        return Err(anyhow!("there is already an account called {name}, at {}", shorten(&existing.dir)));
+    }
+    let dir = dir.unwrap_or_else(|| dir_for(&name));
+    if let Some(other) = all(config).into_iter().find(|account| account.dir == dir) {
+        return Err(anyhow!("{} is already the account {}", shorten(&dir), other.name));
+    }
+    if let Some(port) = port {
+        if let Some(other) = all(config).into_iter().find(|account| account.port == port) {
+            return Err(anyhow!("port {port} already belongs to {}", other.name));
+        }
+    }
+    std::fs::create_dir_all(&dir).with_context(|| format!("cannot create {}", shorten(&dir)))?;
+
+    let entry = config.entry_mut(&name);
+    entry.dir = Some(shorten(&dir));
+    entry.port = port;
+    config.save()?;
+    // Read the account back rather than building one here, so that a port and
+    // a workspace nobody named are the ones discovery hands out, and are the
+    // same numbers every later run will see.
+    let account = find(config, &name)?;
+    let entry = config.entry_mut(&name);
+    entry.port = Some(account.port);
+    entry.workspace.get_or_insert_with(|| shorten(&account.workspace));
+    config.save()?;
+    Ok(account)
+}
+
+/// Forget an account: the configuration entry goes, the profile stays.
+///
+/// A profile directory holds a login, projects and memories, so removing an
+/// account here never removes any of that. What the command undoes is the
+/// registration; `rm -rf` is a decision for a reader who means it.
+pub fn forget(config: &mut Config, name: &str) -> Result<Account> {
+    let account = find(config, name)?;
+    if config.active.as_deref() == Some(account.name.as_str()) {
+        return Err(anyhow!(
+            "{} is the account `claude` runs as. Switch to another one first.",
+            account.name
+        ));
+    }
+    config.accounts.remove(&account.name);
+    config.save()?;
+    Ok(account)
+}
+
 /// Sessions of Claude Code that are running right now, by the profile they
 /// were started in.
 ///
diff --git a/src/completions.rs b/src/completions.rs
new file mode 100644
index 0000000..2fc8dd8
--- /dev/null
+++ b/src/completions.rs
@@ -0,0 +1,133 @@
+//! Tab completion, including the account names.
+//!
+//! The subcommands come out of the parser, so they cannot drift from what the
+//! tool accepts. The account names cannot be baked in the same way: an account
+//! is added, renamed or forgotten long after a completion file was written, and
+//! a file listing yesterday's accounts is worse than none. So the generated
+//! script is followed by a few lines per shell that ask this tool for the names
+//! at the moment somebody presses Tab -- `claude-account list --names` is there
+//! for that and prints nothing else.
+
+use anyhow::{Context, Result};
+use clap::CommandFactory;
+use clap_complete::Shell;
+use std::path::PathBuf;
+
+use crate::paths::{home, shorten, which};
+use crate::Cli;
+
+/// The subcommands whose argument is an account. The dynamic rules offer names
+/// after each of them; anywhere else the generated script has the last word.
+const TAKES_ACCOUNT: &str = "switch dir env url remove start stop restart logs install uninstall port";
+
+/// The completion script for one shell.
+pub fn script(shell: Shell) -> String {
+    let mut command = Cli::command();
+    let name = command.get_name().to_string();
+    let mut out = Vec::new();
+    clap_complete::generate(shell, &mut command, name, &mut out);
+    let mut script = String::from_utf8_lossy(&out).to_string();
+    script.push_str(&dynamic(shell));
+    script
+}
+
+/// Where a shell looks for a completion file it does not have to be told about.
+pub fn destination(shell: Shell) -> Option<PathBuf> {
+    let home = home();
+    match shell {
+        Shell::Fish => Some(home.join(".config/fish/completions/claude-account.fish")),
+        Shell::Bash => Some(home.join(".local/share/bash-completion/completions/claude-account")),
+        Shell::Zsh => Some(home.join(".local/share/zsh/site-functions/_claude-account")),
+        _ => None,
+    }
+}
+
+/// Write the completion file for one shell.
+pub fn install(shell: Shell) -> Result<PathBuf> {
+    let path = destination(shell)
+        .with_context(|| format!("{shell} has no place this tool knows to put a completion file"))?;
+    if let Some(parent) = path.parent() {
+        std::fs::create_dir_all(parent).with_context(|| format!("cannot create {}", shorten(parent)))?;
+    }
+    std::fs::write(&path, script(shell)).with_context(|| format!("cannot write {}", shorten(&path)))?;
+    Ok(path)
+}
+
+/// The shells on this machine that a completion file would reach.
+///
+/// A shell nobody uses gets no file: the point of installing without being
+/// asked which shell is that the answer is obvious, and writing into three
+/// directories to be safe is not that.
+pub fn present() -> Vec<Shell> {
+    let home = home();
+    let mut out = Vec::new();
+    if home.join(".config/fish").is_dir() || which("fish").is_some() {
+        out.push(Shell::Fish);
+    }
+    if home.join(".bashrc").is_file() || which("bash").is_some() {
+        out.push(Shell::Bash);
+    }
+    if home.join(".zshrc").is_file() || which("zsh").is_some() {
+        out.push(Shell::Zsh);
+    }
+    out
+}
+
+/// The lines that put live account names into the completion.
+fn dynamic(shell: Shell) -> String {
+    match shell {
+        Shell::Fish => format!(
+            "\n# The accounts as they are right now, asked for when Tab is pressed.\n\
+             complete -c claude-account -n '__fish_seen_subcommand_from {TAKES_ACCOUNT}' \
+             -f -a '(claude-account list --names)'\n"
+        ),
+        // A wrapper rather than an edit of the generated function: the
+        // generated part stays exactly as clap wrote it, and the dynamic rule
+        // is one case statement that hands back to it for everything else.
+        Shell::Bash => format!(
+            "\n# The accounts as they are right now, asked for when Tab is pressed.\n\
+             _claude_account_dynamic() {{\n\
+             \x20   local previous=\"${{COMP_WORDS[COMP_CWORD-1]}}\"\n\
+             \x20   case \" {TAKES_ACCOUNT} \" in\n\
+             \x20       *\" $previous \"*)\n\
+             \x20           mapfile -t COMPREPLY < <(compgen -W \"$(claude-account list --names \
+             2>/dev/null)\" -- \"${{COMP_WORDS[COMP_CWORD]}}\")\n\
+             \x20           return 0 ;;\n\
+             \x20   esac\n\
+             \x20   _claude-account \"$@\"\n\
+             }}\n\
+             complete -F _claude_account_dynamic -o nosort -o bashdefault -o default claude-account\n"
+        ),
+        Shell::Zsh => format!(
+            "\n# The accounts as they are right now, asked for when Tab is pressed.\n\
+             _claude_account_dynamic() {{\n\
+             \x20   local previous=${{words[CURRENT-1]}}\n\
+             \x20   if [[ \" {TAKES_ACCOUNT} \" == *\" $previous \"* ]]; then\n\
+             \x20       local -a names\n\
+             \x20       names=(${{(f)\"$(claude-account list --names 2>/dev/null)\"}})\n\
+             \x20       if (( ${{#names}} )); then\n\
+             \x20           _describe -t accounts account names\n\
+             \x20           return\n\
+             \x20       fi\n\
+             \x20   fi\n\
+             \x20   _claude-account \"$@\"\n\
+             }}\n\
+             compdef _claude_account_dynamic claude-account\n"
+        ),
+        _ => String::new(),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn every_script_asks_for_the_names_at_completion_time() {
+        for shell in [Shell::Fish, Shell::Bash, Shell::Zsh] {
+            let script = script(shell);
+            assert!(script.contains("claude-account list --names"), "{shell} has no dynamic names");
+            assert!(script.contains("switch"), "{shell} is missing the subcommands");
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index f1955e1..f694db5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@
 //! whichever account was switched to last.
 
 mod account;
+mod completions;
 mod config;
 mod headroom;
 mod paths;
@@ -16,6 +17,7 @@ mod ui;
 
 use anyhow::{anyhow, Result};
 use clap::{Parser, Subcommand};
+use clap_complete::Shell;
 
 use crate::account::Account;
 use crate::config::Config;
@@ -28,7 +30,7 @@ use crate::paths::shorten;
     about = "Switch the Claude account `claude` runs as, with a Headroom proxy per account.",
     disable_help_subcommand = true
 )]
-struct Cli {
+pub struct Cli {
     #[command(subcommand)]
     command: Option<Command>,
 }
@@ -42,12 +44,35 @@ enum Command {
         verbose: bool,
     },
     /// List the accounts, one per line
-    List,
+    List {
+        /// Print the names alone, for scripts and for tab completion
+        #[arg(long)]
+        names: bool,
+    },
     /// Make an account the one `claude` runs as
     Switch {
         /// The account, as `list` names it
         account: String,
     },
+    /// Register another account, with a profile and a proxy of its own
+    Add {
+        /// What to call it; also the directory, as `~/.claude-<name>`
+        name: String,
+        /// A profile directory elsewhere
+        #[arg(long)]
+        dir: Option<std::path::PathBuf>,
+        /// A port for its proxy; the next free one by default
+        #[arg(long)]
+        port: Option<u16>,
+        /// Make it the account `claude` runs as straight away
+        #[arg(long)]
+        switch: bool,
+    },
+    /// Forget an account. Its profile directory is left where it is
+    Remove {
+        /// The account, as `list` names it
+        account: String,
+    },
     /// Print the name of the active account
     Current,
     /// Print the profile directory of an account, for `CLAUDE_CONFIG_DIR`
@@ -86,6 +111,14 @@ enum Command {
         #[command(subcommand)]
         command: RouterCommand,
     },
+    /// Tab completion, with the account names in it
+    Completions {
+        /// The shell; every shell on this machine when left out
+        shell: Option<Shell>,
+        /// Write the file where the shell reads it, instead of printing it
+        #[arg(long)]
+        install: bool,
+    },
 }
 
 #[derive(Subcommand)]
@@ -165,9 +198,13 @@ fn run() -> Result<()> {
             }
             std::process::exit(1);
         }
-        Command::List => {
+        Command::List { names } => {
             let active = account::active(&config).map(|account| account.name);
             for account in account::all(&config) {
+                if names {
+                    println!("{}", account.name);
+                    continue;
+                }
                 let marker = if Some(&account.name) == active.as_ref() { "*" } else { " " };
                 println!(
                     "{marker} {:<10} {:<28} {}",
@@ -179,6 +216,10 @@ fn run() -> Result<()> {
             Ok(())
         }
         Command::Switch { account } => switch(&mut config, &account),
+        Command::Add { name, dir, port, switch: and_switch } => {
+            add(&mut config, &name, dir, port, and_switch)
+        }
+        Command::Remove { account } => remove(&mut config, &account),
         Command::Current => {
             let account = require_active(&config)?;
             println!("{}", account.name);
@@ -195,22 +236,13 @@ fn run() -> Result<()> {
             println!("export ENQS_CLAUDE_PROFILE={}", account.dir.display());
             Ok(())
         }
-        Command::Url { name } => {
-            let name = match name {
-                Some(name) => name,
-                None => require_active(&config)?.name,
-            };
-            println!("{}", router::url(&config, &name));
-            if router::resolve(&config, &name).is_none() {
-                eprintln!("{} nothing is published as {name} right now", ui::yellow("note:"));
-            }
-            Ok(())
-        }
+        Command::Url { name } => url(&config, name.as_deref()),
         Command::Setup => setup(&mut config),
         Command::Adopt => adopt(&mut config),
         Command::Shim { command } => shim_command(command),
         Command::Headroom { command } => headroom_command(&mut config, command),
         Command::Router { command } => router_command(&mut config, command),
+        Command::Completions { shell, install } => completions_command(shell, install),
     }
 }
 
@@ -241,6 +273,111 @@ fn switch(config: &mut Config, name: &str) -> Result<()> {
     Ok(())
 }
 
+/// Register another account and give it everything an account has: a profile
+/// directory, a port, a workspace and a proxy service of its own.
+///
+/// Doing all of that here is the point. An account added by hand is an entry
+/// in a file that nothing acts on until somebody remembers the three commands
+/// that follow it, and a proxy that is missing is only noticed when a session
+/// cannot connect.
+fn add(
+    config: &mut Config,
+    name: &str,
+    dir: Option<std::path::PathBuf>,
+    port: Option<u16>,
+    and_switch: bool,
+) -> Result<()> {
+    let account = account::add(config, name, dir, port)?;
+    ui::done(format!("Account {} added.", ui::bold(&account.name)));
+    ui::field("profile", shorten(&account.dir));
+    match headroom::binary() {
+        Some(_) => {
+            let installed = headroom::install(&account)?;
+            ui::field("proxy", format!("port {} ({})", account.port, installed.unit));
+            ui::field("workspace", shorten(&account.workspace));
+        }
+        None => {
+            ui::field(
+                "proxy",
+                ui::yellow(format!("port {} is reserved, but headroom is not installed", account.port)),
+            );
+            ui::hint("pip install \"headroom-ai[proxy]\"");
+        }
+    }
+    if and_switch {
+        return switch(config, &account.name);
+    }
+    if account.email().is_none() {
+        ui::field("login", ui::yellow("none yet"));
+        ui::hint(format!("claude-account switch {} && claude /login", account.name));
+    }
+    Ok(())
+}
+
+/// Forget an account. The profile directory and the workspace stay: this
+/// command undoes a registration, not a login and not a year of projects.
+fn remove(config: &mut Config, name: &str) -> Result<()> {
+    let account = account::forget(config, name)?;
+    headroom::uninstall(&account)?;
+    ui::done(format!("Account {} forgotten; its proxy service is gone.", ui::bold(&account.name)));
+    ui::field("profile", format!("{} is left where it is", shorten(&account.dir)));
+    ui::field("workspace", format!("{} is left where it is", shorten(&account.workspace)));
+    // Discovery looks at `~/.claude*` as well, so a profile that still holds a
+    // login comes back in the listing without its overrides. Better said than
+    // discovered in the next `list`.
+    if account.has_credentials() {
+        ui::field("note", "the profile still holds a login, so `list` keeps showing it");
+    }
+    Ok(())
+}
+
+/// The address of a name: an account's proxy, or a jail's.
+///
+/// An account's own label comes before a jail's, the way the router resolves
+/// it, and the active account is meant when nothing is named.
+fn url(config: &Config, name: Option<&str>) -> Result<()> {
+    let name = match name {
+        Some(name) => name.to_string(),
+        None => require_active(config)?.name,
+    };
+    let Some(port) = router::resolve(config, &name) else {
+        return Err(anyhow!("nothing is called {name} right now. Run `claude-account router list`."));
+    };
+    println!("{}", router::label_url(config, &name));
+    if !router::is_listening(port) {
+        eprintln!("{} nothing answers on port {port}, where that name points", ui::yellow("note:"));
+    }
+    Ok(())
+}
+
+fn completions_command(shell: Option<Shell>, install: bool) -> Result<()> {
+    let shells: Vec<Shell> = match shell {
+        Some(shell) => vec![shell],
+        None if install => completions::present(),
+        None => {
+            return Err(anyhow!(
+                "name a shell to print its completion, or use --install to write the files for \
+                 every shell on this machine"
+            ))
+        }
+    };
+    if !install {
+        for shell in shells {
+            print!("{}", completions::script(shell));
+        }
+        return Ok(());
+    }
+    for shell in shells {
+        let path = completions::install(shell)?;
+        ui::done(format!("Completion for {shell} written to {}.", shorten(&path)));
+        if shell == Shell::Zsh {
+            ui::field("note", "that directory has to be in the fpath before compinit");
+        }
+    }
+    ui::field("in this shell", "open a new one, or reload the completions");
+    Ok(())
+}
+
 fn setup(config: &mut Config) -> Result<()> {
     let (path, real) = shim::install(false)?;
     ui::done(format!("Wrapper written to {} (hands over to {}).", shorten(&path), shorten(&real)));
@@ -257,14 +394,31 @@ fn setup(config: &mut Config) -> Result<()> {
     let (path, unit) = service::install(config)?;
     ui::done(format!("Router on port {}.", config.router_port()));
     ui::field("unit", format!("{unit} ({})", shorten(&path)));
-    if let Some(account) = account::active(config) {
-        ui::field("bare name", format!("{} goes to {}", router::bare_url(config), account.name));
+    for account in account::all(config) {
+        ui::field(&account.name, router::label_url(config, &account.name));
+    }
+    for shell in completions::present() {
+        let path = completions::install(shell)?;
+        ui::done(format!("Completion for {shell} in {}.", shorten(&path)));
     }
     let legacy = headroom::legacy_units();
     if !legacy.is_empty() {
         ui::field("note", format!("{} still run beside these", legacy.join(", ")));
         ui::hint("claude-account adopt");
     }
+    // A leftover alias is the one thing here that cannot be repaired from this
+    // process: it lives in somebody's shell configuration and beats every
+    // executable in the PATH, so all it can be given is a line and a location.
+    for shadow in shim::shadows() {
+        ui::field(
+            "in the way",
+            ui::yellow(format!(
+                "{}:{} defines `claude` itself and wins over the wrapper",
+                shorten(&shadow.file),
+                shadow.line
+            )),
+        );
+    }
     Ok(())
 }
 
@@ -355,7 +509,7 @@ fn headroom_command(config: &mut Config, command: HeadroomCommand) -> Result<()>
                 ui::field("unit", installed.unit);
                 ui::field("environment", shorten(&installed.environment));
                 ui::field("workspace", shorten(&account.workspace));
-                ui::field("address", router::url(config, &account.name));
+                ui::field("address", address(config, &account));
                 if installed.routed {
                     ui::field("settings.json", "now points at that proxy");
                 }
@@ -406,7 +560,7 @@ fn headroom_command(config: &mut Config, command: HeadroomCommand) -> Result<()>
             let installed = headroom::install(&account)?;
             ui::done(format!("{} now runs its proxy on port {port}.", account.name));
             ui::field("unit", installed.unit);
-            ui::field("address", router::url(config, &account.name));
+            ui::field("address", address(config, &account));
             Ok(())
         }
         HeadroomCommand::Logs { account, lines } => {
@@ -470,7 +624,7 @@ fn router_command(config: &mut Config, command: RouterCommand) -> Result<()> {
                 service::install(config)?;
                 ui::field("service", "rewritten and restarted");
             }
-            ui::field("addresses", router::bare_url(config));
+            ui::field("addresses", format!("{} and every <name> under it", router::bare_url(config)));
             Ok(())
         }
         RouterCommand::List => {
@@ -478,7 +632,7 @@ fn router_command(config: &mut Config, command: RouterCommand) -> Result<()> {
                 let answers = if router::is_listening(entry.port) { "" } else { " (nothing answers)" };
                 println!(
                     "{:<40} {:>6}  {}{answers}",
-                    router::url(config, &entry.name),
+                    router::name_url(config, &entry),
                     entry.port,
                     entry.source
                 );
@@ -488,6 +642,12 @@ fn router_command(config: &mut Config, command: RouterCommand) -> Result<()> {
     }
 }
 
+/// Where one account's proxy is reached: its own name, whichever account is
+/// active.
+fn address(config: &Config, account: &Account) -> String {
+    router::label_url(config, &account.name)
+}
+
 /// Write what discovery worked out into the configuration, so that the router
 /// service and the wrapper see the same numbers as this run.
 fn remember(config: &mut Config, account: &Account) {
diff --git a/src/router.rs b/src/router.rs
index 51f703b..1f1f621 100644
--- a/src/router.rs
+++ b/src/router.rs
@@ -6,16 +6,27 @@
 //! name, and one router on a fixed port forwards that name to the port of the
 //! moment:
 //!
-//! * `headroom.localhost` -- the proxy of the account that is active right
-//!   now. The shortest address follows the switch, which is the point: there
-//!   is one address to keep in a bookmark and it is always the dashboard of
-//!   the account being worked in.
 //! * `<account>.headroom.localhost` -- that one account's proxy, active or
-//!   not, for looking at the other one without switching.
+//!   not. Two accounts can have sessions open at the same time, and each of
+//!   them has to be able to name its own proxy: an address that follows the
+//!   switch would send a session of the other account to the wrong dashboard.
 //! * `<jail>.headroom.localhost` -- the proxy a jail started for itself. Those
 //!   are published as run files by the `enqs-jail` plugin, and this router
-//!   reads the same directory in the same format, so a jail keeps its name
-//!   whichever of the two routers is serving the domain.
+//!   reads the same directory in the same format.
+//! * `headroom.localhost` -- the proxy of the account that is active right
+//!   now, for a bookmark. Nothing this tool or the plugin prints uses it,
+//!   because which account it means changes under a session that is open.
+//!
+//! Accounts and jails share one set of labels, so a jail may be called like an
+//! account. The account keeps the name then: it is there for good and a jail
+//! only for one session, and a bookmark must not start opening a customer's
+//! proxy because a jail of that name happens to be running. The jail answers
+//! on its port instead, and `status` says why.
+//!
+//! What a name points at is only ever decided here. A client that wants to
+//! print one asks `/names?port=<port>` which name reaches that port, and gets
+//! the address or a 404; it never builds a name itself and so never prints one
+//! that goes somewhere else.
 //!
 //! `*.localhost` resolves to the loopback address without any configuration,
 //! in every browser and on this machine, so none of these names costs a line
@@ -56,6 +67,8 @@ pub struct Published {
 /// What one name stands for, for the listing and the diagnostics.
 #[derive(Debug, Clone)]
 pub struct Name {
+    /// The label in front of the domain. Empty for the bare name, which is
+    /// what the active account answers on.
     pub name: String,
     pub port: u16,
     pub kind: Kind,
@@ -65,10 +78,22 @@ pub struct Name {
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Kind {
+    /// The bare name, pointing at the account that is active right now.
+    Active,
     Account,
     Jail,
 }
 
+impl Kind {
+    pub fn describe(&self) -> &'static str {
+        match self {
+            Kind::Active => "the active account",
+            Kind::Account => "account",
+            Kind::Jail => "jail",
+        }
+    }
+}
+
 /// A name as a DNS label: lower case, letters, digits and hyphens.
 ///
 /// A jail may be called anything, and a name that is not a label would simply
@@ -113,53 +138,81 @@ pub fn loopback_port(url: &str) -> Option<u16> {
     }
 }
 
-/// The URL a name is reachable at.
+/// The URL a label is reachable at, an account's or a jail's.
 ///
 /// Port 80 is left out, because a browser and a terminal both assume it: that
 /// is what a router on the privileged port buys.
-pub fn url(config: &Config, name: &str) -> String {
-    let host = format!("{}.{DOMAIN}", label(name));
+pub fn label_url(config: &Config, name: &str) -> String {
+    host_url(config, &format!("{}.{DOMAIN}", label(name)))
+}
+
+/// The URL the domain itself is reachable at: the active account's proxy.
+pub fn bare_url(config: &Config) -> String {
+    host_url(config, DOMAIN)
+}
+
+fn host_url(config: &Config, host: &str) -> String {
     match config.router_port() {
         80 => format!("http://{host}"),
         port => format!("http://{host}:{port}"),
     }
 }
 
-/// The URL the domain itself is reachable at: the active account's proxy.
-pub fn bare_url(config: &Config) -> String {
-    match config.router_port() {
-        80 => format!("http://{DOMAIN}"),
-        port => format!("http://{DOMAIN}:{port}"),
-    }
-}
-
-/// Every name that resolves right now.
-///
-/// Jails come first: a jail may be called `work` as well, and the proxy a
-/// session started for itself is the one that session means.
+/// Every name that resolves right now: the bare one, the accounts, then the
+/// jails that do not share a label with an account.
 pub fn names(config: &Config) -> Vec<Name> {
-    let mut out: Vec<Name> = published()
-        .into_iter()
-        .map(|entry| Name { name: entry.name, port: entry.port, kind: Kind::Jail, source: entry.jail })
-        .collect();
+    let mut out = Vec::new();
+    if let Some(account) = account::active(config) {
+        out.push(Name {
+            name: String::new(),
+            port: account.port,
+            kind: Kind::Active,
+            source: crate::paths::shorten(&account.dir),
+        });
+    }
     for account in account::all(config) {
-        if out.iter().any(|name| name.name == account.name) {
+        let name = label(&account.name);
+        if out.iter().any(|entry| entry.kind != Kind::Active && entry.name == name) {
             continue;
         }
         out.push(Name {
-            name: account.name,
+            name,
             port: account.port,
             kind: Kind::Account,
             source: crate::paths::shorten(&account.dir),
         });
     }
+    for entry in published() {
+        if out.iter().any(|name| name.kind != Kind::Active && name.name == entry.name) {
+            continue;
+        }
+        out.push(Name { name: entry.name, port: entry.port, kind: Kind::Jail, source: entry.jail });
+    }
     out
 }
 
-/// The port a name resolves to right now.
+/// The jails that are running but have no name, because an account holds the
+/// label they would have had.
+pub fn shadowed_jails(config: &Config) -> Vec<Published> {
+    let accounts: Vec<String> = account::all(config).iter().map(|account| label(&account.name)).collect();
+    published().into_iter().filter(|entry| accounts.contains(&entry.name)).collect()
+}
+
+/// The URL one of those names is reachable at.
+pub fn name_url(config: &Config, name: &Name) -> String {
+    match name.kind {
+        Kind::Active => bare_url(config),
+        Kind::Account | Kind::Jail => label_url(config, &name.name),
+    }
+}
+
+/// The port a label resolves to right now.
 pub fn resolve(config: &Config, name: &str) -> Option<u16> {
     let wanted = label(name);
-    names(config).into_iter().find(|entry| entry.name == wanted).map(|entry| entry.port)
+    names(config)
+        .into_iter()
+        .find(|entry| entry.kind != Kind::Active && entry.name == wanted)
+        .map(|entry| entry.port)
 }
 
 /// The port the domain itself resolves to: the proxy of the active account.
@@ -167,6 +220,19 @@ pub fn resolve_bare(config: &Config) -> Option<u16> {
     account::active(config).map(|account| account.port)
 }
 
+/// The name that reaches a port, as an address.
+///
+/// Never the bare domain: that one follows the switch, and the session that
+/// asks keeps its account when the switch moves on. `None` when no label
+/// reaches the port, which is the answer for a jail whose name an account
+/// holds, and for a port nothing here knows.
+pub fn lookup(config: &Config, port: u16) -> Option<String> {
+    names(config)
+        .into_iter()
+        .find(|entry| entry.kind != Kind::Active && entry.port == port)
+        .map(|entry| name_url(config, &entry))
+}
+
 /// Every jail proxy whose session is still running.
 pub fn published() -> Vec<Published> {
     let Ok(entries) = std::fs::read_dir(runtime_dir()) else { return Vec::new() };
@@ -244,9 +310,23 @@ fn handle(mut client: TcpStream) -> Result<()> {
     let Some(host) = header(&head, "host") else {
         return answer(&mut client, 400, "No Host header, so there is no name to resolve.");
     };
-    let name = host_label(&host);
-    let bare = name.is_empty() || name == "headroom";
+    let Some(name) = host_label(&host) else {
+        return answer(
+            &mut client,
+            404,
+            &format!("{host} is not a name under {DOMAIN}. The list is at http://{DOMAIN}/names."),
+        );
+    };
+    let bare = name.is_empty();
     if bare && target(&head).as_deref() == Some("/names") {
+        // A client that wants to print an address asks here which one reaches
+        // its port, rather than working a name out for itself.
+        if let Some(wanted) = query(&head, "port") {
+            return match wanted.parse::<u16>().ok().and_then(|port| lookup(&config, port)) {
+                Some(url) => answer_plain(&mut client, 200, &url),
+                None => answer(&mut client, 404, &format!("No name reaches port {wanted}.")),
+            };
+        }
         return answer_html(&mut client, &index(&config));
     }
     let port = if bare { resolve_bare(&config) } else { resolve(&config, &name) };
@@ -312,13 +392,37 @@ fn target(head: &[u8]) -> Option<String> {
     Some(path.split('?').next().unwrap_or(path).to_string())
 }
 
-/// The label in front of `.headroom.localhost` in a Host header.
-fn host_label(host: &str) -> String {
-    let host = host.split(':').next().unwrap_or(host);
-    let host = host.strip_suffix('.').unwrap_or(host);
-    let front = host.strip_suffix(".localhost").unwrap_or(host);
-    let front = front.strip_suffix(".headroom").unwrap_or(front);
-    sanitize(front)
+/// One parameter of the request's query.
+fn query(head: &[u8], wanted: &str) -> Option<String> {
+    let text = String::from_utf8_lossy(head);
+    let line = text.lines().next()?;
+    let (_, query) = line.split_whitespace().nth(1)?.split_once('?')?;
+    query.split('&').find_map(|pair| {
+        let (key, value) = pair.split_once('=')?;
+        (key == wanted).then(|| value.to_string())
+    })
+}
+
+/// The label in front of `.headroom.localhost` in a Host header: empty for
+/// the domain itself, and `None` for a host that is not under the domain.
+///
+/// Strict, because a name that is only nearly right must not reach a proxy:
+/// `localhost` or `127.0.0.1` would otherwise become a label, and so would
+/// every level of `a.b.headroom.localhost`.
+fn host_label(host: &str) -> Option<String> {
+    if host.starts_with('[') {
+        return None;
+    }
+    let host = host.split(':').next().unwrap_or(host).trim_end_matches('.').to_ascii_lowercase();
+    if host == DOMAIN {
+        return Some(String::new());
+    }
+    let front = host.strip_suffix(&format!(".{DOMAIN}"))?;
+    if front.contains('.') {
+        return None;
+    }
+    let name = sanitize(front);
+    (!name.is_empty()).then_some(name)
 }
 
 fn answer(stream: &mut TcpStream, status: u16, message: &str) -> Result<()> {
@@ -333,6 +437,19 @@ fn answer(stream: &mut TcpStream, status: u16, message: &str) -> Result<()> {
     Ok(())
 }
 
+/// A one-line answer for a program, without the status repeated in the body.
+fn answer_plain(stream: &mut TcpStream, status: u16, line: &str) -> Result<()> {
+    let body = format!("{line}\n");
+    let head = format!(
+        "HTTP/1.1 {status} \r\nContent-Type: text/plain; charset=utf-8\r\nContent-Length: {}\r\nConnection: close\r\n\r\n",
+        body.len()
+    );
+    stream.write_all(head.as_bytes())?;
+    stream.write_all(body.as_bytes())?;
+    stream.flush()?;
+    Ok(())
+}
+
 fn answer_html(stream: &mut TcpStream, body: &str) -> Result<()> {
     let head = format!(
         "HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=utf-8\r\nContent-Length: {}\r\nConnection: close\r\n\r\n",
@@ -349,12 +466,8 @@ fn index(config: &Config) -> String {
     let active = account::active(config).map(|account| account.name).unwrap_or_default();
     let mut rows = String::new();
     for entry in names(config) {
-        let kind = match entry.kind {
-            Kind::Account if entry.name == active => "account, active",
-            Kind::Account => "account",
-            Kind::Jail => "jail",
-        };
-        let address = url(config, &entry.name);
+        let kind = entry.kind.describe();
+        let address = name_url(config, &entry);
         rows.push_str(&format!(
             "<tr><td><a href=\"{address}\">{address}</a></td><td>{kind}</td><td>{}</td><td>{}</td></tr>",
             entry.port,
@@ -367,7 +480,8 @@ fn index(config: &Config) -> String {
          td,th{{padding:.25rem 1rem .25rem 0;text-align:left;vertical-align:top}}\
          code{{background:#eee;padding:.1rem .3rem;border-radius:3px}}</style>\
          <h1>headroom.localhost</h1>\
-         <p>The bare name goes to the proxy of the active account, <code>{active}</code>.</p>\
+         <p>Every account and every jail has a name of its own. The bare name goes to the proxy of \
+         the active account, <code>{active}</code>, and follows the switch.</p>\
          <table><tr><th>Address<th>What<th>Port<th>Where</tr>{rows}</table>",
         active = html(&active),
     )
@@ -383,9 +497,34 @@ mod tests {
 
     #[test]
     fn a_host_header_gives_the_label() {
-        assert_eq!(host_label("work.headroom.localhost"), "work");
-        assert_eq!(host_label("headroom.localhost:80"), "headroom");
-        assert_eq!(host_label("my_jail.headroom.localhost"), "my-jail");
+        assert_eq!(host_label("work.headroom.localhost").as_deref(), Some("work"));
+        assert_eq!(host_label("Work.Headroom.Localhost.:80").as_deref(), Some("work"));
+        assert_eq!(host_label("my_jail.headroom.localhost").as_deref(), Some("my-jail"));
+        assert_eq!(host_label("headroom.headroom.localhost").as_deref(), Some("headroom"));
+    }
+
+    #[test]
+    fn the_domain_itself_is_the_bare_name() {
+        assert_eq!(host_label("headroom.localhost").as_deref(), Some(""));
+        assert_eq!(host_label("headroom.localhost:80").as_deref(), Some(""));
+    }
+
+    #[test]
+    fn a_host_outside_the_domain_is_no_name() {
+        assert_eq!(host_label("localhost"), None);
+        assert_eq!(host_label("127.0.0.1:80"), None);
+        assert_eq!(host_label("[::1]:80"), None);
+        assert_eq!(host_label("a.b.headroom.localhost"), None);
+        assert_eq!(host_label("evilheadroom.localhost"), None);
+        assert_eq!(host_label("-.headroom.localhost"), None);
+    }
+
+    #[test]
+    fn the_port_is_read_from_the_query() {
+        let head = b"GET /names?x=1&port=8788 HTTP/1.1\r\nHost: headroom.localhost\r\n\r\n";
+        assert_eq!(query(head, "port").as_deref(), Some("8788"));
+        assert_eq!(target(head).as_deref(), Some("/names"));
+        assert_eq!(query(b"GET /names HTTP/1.1\r\n\r\n", "port"), None);
     }
 
     #[test]
diff --git a/src/shim.rs b/src/shim.rs
index 7c8273e..67f85b1 100644
--- a/src/shim.rs
+++ b/src/shim.rs
@@ -24,6 +24,69 @@ pub fn path() -> PathBuf {
     home().join(".local/bin/claude")
 }
 
+/// A line in a shell's startup file that defines `claude` itself.
+///
+/// This is the one way to be in the right profile and still land in the wrong
+/// account, and it is invisible from here otherwise: an alias or a function
+/// beats every executable in the `PATH`, and one that sets `CLAUDE_CONFIG_DIR`
+/// beats the wrapper twice over, because the wrapper leaves a value that is
+/// already set alone. The machine this tool was written on had exactly that,
+/// left over from before there was a switch, and every switch looked ignored.
+#[derive(Debug, Clone)]
+pub struct Shadow {
+    pub file: PathBuf,
+    pub line: usize,
+    pub text: String,
+}
+
+/// The startup files that are read often enough to hide a definition in.
+fn startup_files() -> Vec<PathBuf> {
+    let home = home();
+    let mut files = vec![
+        home.join(".bashrc"),
+        home.join(".bash_profile"),
+        home.join(".zshrc"),
+        home.join(".profile"),
+        home.join(".config/fish/config.fish"),
+    ];
+    if let Ok(entries) = std::fs::read_dir(home.join(".config/fish/conf.d")) {
+        files.extend(entries.flatten().map(|entry| entry.path()));
+    }
+    files
+}
+
+/// Every definition of `claude` a shell would pick up instead of the wrapper.
+pub fn shadows() -> Vec<Shadow> {
+    let mut out = Vec::new();
+    for file in startup_files() {
+        let Ok(body) = std::fs::read_to_string(&file) else { continue };
+        for (index, line) in body.lines().enumerate() {
+            let text = line.trim();
+            if text.starts_with('#') {
+                continue;
+            }
+            if defines_claude(text) {
+                out.push(Shadow { file: file.clone(), line: index + 1, text: text.to_string() });
+            }
+        }
+    }
+    out
+}
+
+/// Whether a line defines the `claude` command, in any of the three shells.
+///
+/// `claude-work` and the like are deliberately not matched: a second name is
+/// somebody's shortcut and shadows nothing.
+fn defines_claude(line: &str) -> bool {
+    let defined = |keyword: &str| -> bool {
+        let Some(rest) = line.strip_prefix(keyword) else { return false };
+        let rest = rest.trim_start();
+        let name = rest.split(|character: char| character.is_whitespace() || character == '=').next();
+        name.map(|name| name.trim_matches(['"', '\''])) == Some("claude")
+    };
+    defined("alias ") || defined("function ") || line.starts_with("claude()")
+}
+
 /// What the wrapper looks like right now.
 #[derive(Debug, Clone)]
 pub struct State {
@@ -122,3 +185,23 @@ fn make_executable(path: &Path) -> Result<()> {
     std::fs::set_permissions(path, permissions)?;
     Ok(())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn a_definition_of_claude_is_recognised_in_every_shell() {
+        assert!(defines_claude("alias claude=\"CLAUDE_CONFIG_DIR=~/.claude command claude\""));
+        assert!(defines_claude("alias claude='claude --verbose'"));
+        assert!(defines_claude("function claude --description 'x'"));
+        assert!(defines_claude("claude() { command claude \"$@\"; }"));
+    }
+
+    #[test]
+    fn another_command_is_not_a_shadow() {
+        assert!(!defines_claude("alias claude-work=\"CLAUDE_CONFIG_DIR=~/.claude-work claude\""));
+        assert!(!defines_claude("alias cc=claude"));
+        assert!(!defines_claude("function claudia"));
+    }
+}
diff --git a/src/status.rs b/src/status.rs
index cc9e900..0bd58d2 100644
--- a/src/status.rs
+++ b/src/status.rs
@@ -12,7 +12,7 @@ use crate::account::{self, Account};
 use crate::config::Config;
 use crate::headroom;
 use crate::paths::shorten;
-use crate::router::{self, Kind};
+use crate::router;
 use crate::service;
 use crate::shim;
 use crate::systemd;
@@ -68,7 +68,7 @@ fn account_section(
         let plan = account.plan().map(|plan| format!(" ({plan})")).unwrap_or_default();
         println!("  {marker} {:<10} {}{}", ui::bold(&account.name), who, ui::dim(plan));
         ui::field("profile", shorten(&account.dir));
-        ui::field("proxy", format!("{} on port {}", router::url(config, &account.name), account.port));
+        ui::field("proxy", proxy_line(config, account));
         ui::field("plugins", plugins_line(account));
         match account.token_minutes_left() {
             Some(minutes) if minutes < 0 => {
@@ -122,6 +122,12 @@ fn account_section(
     let _ = config;
 }
 
+/// Where an account's proxy is reached. Every account has a name of its own,
+/// so a session of either one can show its dashboard while both are open.
+fn proxy_line(config: &Config, account: &Account) -> String {
+    format!("{} on port {}", router::label_url(config, &account.name), account.port)
+}
+
 fn plugins_line(account: &Account) -> String {
     let plugins = account.plugins();
     match plugins.len() {
@@ -199,6 +205,22 @@ fn command_section(active: Option<&Account>, problems: &mut Vec<Problem>) {
             ui::field("this shell", format!("CLAUDE_CONFIG_DIR={explicit}"));
         }
     }
+    // An alias or a shell function called `claude` is found before anything in
+    // the PATH, and one that sets CLAUDE_CONFIG_DIR is never overruled by the
+    // wrapper, which leaves a value that is already set alone. Every switch
+    // then looks ignored, and nothing else in this report would show why.
+    for shadow in shim::shadows() {
+        ui::warn("shell", format!("{}:{} defines `claude`", shorten(&shadow.file), shadow.line));
+        ui::field("line", ui::dim(&shadow.text));
+        problems.push(Problem::new(
+            format!(
+                "{}:{} defines `claude` in the shell, which wins over the wrapper and pins the account",
+                shorten(&shadow.file),
+                shadow.line
+            ),
+            Some("remove that line; `claude` follows the switch by itself"),
+        ));
+    }
 }
 
 fn proxy_section(accounts: &[Account], active: Option<&Account>, problems: &mut Vec<Problem>, verbose: bool) {
@@ -345,20 +367,22 @@ fn router_section(config: &Config, active: Option<&Account>, problems: &mut Vec<
     match active {
         Some(account) => ui::field(
             "bare name",
-            format!("{} goes to {} on port {}", router::bare_url(config), account.name, account.port),
+            format!(
+                "{} follows the switch, now to {} on port {}",
+                router::bare_url(config),
+                account.name,
+                account.port
+            ),
         ),
         None => ui::field("bare name", ui::yellow("goes nowhere: no account is active")),
     }
     for entry in router::names(config) {
-        let kind = match entry.kind {
-            Kind::Account => "account",
-            Kind::Jail => "jail",
-        };
+        let kind = entry.kind.describe();
         let answers = router::is_listening(entry.port);
         let mark = if answers { ui::green("✓") } else { ui::yellow("!") };
         println!(
             "  {mark} {:<38} {}",
-            router::url(config, &entry.name),
+            router::name_url(config, &entry),
             ui::dim(format!("{kind}, port {} — {}", entry.port, entry.source))
         );
     }
@@ -370,10 +394,22 @@ fn jail_section(config: &Config, problems: &mut Vec<Problem>) {
         return;
     }
     ui::heading("Jails with a proxy of their own");
+    let shadowed: Vec<String> = router::shadowed_jails(config).into_iter().map(|jail| jail.name).collect();
     for jail in jails {
         let answers = router::is_listening(jail.port);
-        if answers {
-            ui::ok(&jail.name, format!("{} — {}", router::url(config, &jail.name), jail.jail));
+        if answers && shadowed.contains(&jail.name) {
+            // The label is the account's, so printing it would hand out the
+            // address of another proxy. The port is the one right answer.
+            ui::warn(&jail.name, format!("http://127.0.0.1:{} — {}", jail.port, jail.jail));
+            problems.push(Problem::new(
+                format!(
+                    "the jail {} has no name: the account {} holds that label, so the jail answers on port {} only",
+                    jail.name, jail.name, jail.port
+                ),
+                Some("register the jail under another name with `enqs-jail register <dir> --name <name> --force`"),
+            ));
+        } else if answers {
+            ui::ok(&jail.name, format!("{} — {}", router::label_url(config, &jail.name), jail.jail));
         } else {
             ui::bad(&jail.name, format!("published on port {} but nothing answers", jail.port));
             problems.push(Problem::new(