v0.3.0 local · read-only by default · no telemetry

> tail -f for AI coding agents

One calm, live dashboard for the agents that write your code: the file being edited, the command being run, the chat, the thinking and what it all costs. For DeepSeek Harness, Claude Code and Antigravity.

⬇ Download for Windows
pwsh

      

    

    

      
      
this is Tail. it follows your pointer. click it.

    

  


  
  

    

      
live demo

      
Watch an agent work

      
A replay of a small session, in the page: the agent fixes a bug, runs the tests, thinks, fails the lint, fixes it and answers. The console comes up while a command runs, Tail reacts to every result, and on a long think it gets bored and plays.

    

    

      

        >· agenttail
        ● Fix the calculator demo
        
          STEPS 0
          TOKENS 0
          TOK/S 0
          COST $0.0000 ≈ API
        
        ● LIVE
      

      
·IDLE

      

        
        

          
src/calculator.js
    
          
    CONSOLE
    
        
    
        
      
    
    
    
    
    The dashboard here is drawn by this page; Tail, its bubble and its games are the real code from the app.
    
  
    

  
  
    
    
    
      
    what you get
    
      
    Everything the agent does, as it does it
    
    
    
    
    
      
    ✍️
    Live editor typing
    Follows the file the agent is editing and types each edit in place, with a short highlight sweep. The tree keeps the heat: edits, failures, deleted files.
    
      
    🎭
    Console on stage
    A running command brings the console up over the editor; an edit sends it back; a quiet console shrinks to a rail. Job progress, spinners, exit codes.
    
      
    💬
    Chat and Log
    Chat reads like a conversation, with thinking and tool calls folded. Log is the full trajectory, with a summary per turn, exportable as Markdown.
    
      
    👥
    Several agents
    Every agent active in the last 30 minutes, grouped by git repository, each in its own colour. Alt+W opens the watch wall.
    
      
    🐾
    Tail, the mascot
    Reacts to passing and failing commands, cheers when a turn ends, thinks out loud and plays one of ten games on a long think. You can take over.
    
      
    🧮
    Cost, tokens, TOK/S
    Tokens, output speed and cost per session and per turn. For Claude Code, what the tokens would cost at API list prices, even on a subscription.
    
      
    ⏪
    Replay
    Finished sessions replay through the same pipeline, typing included, at the speed you pick.
    
      
    🔒
    Stream mode
    Secrets and identity are redacted on the server, before anything reaches the browser. If redaction fails, the event is dropped, never sent raw.
    
      
    🎛️
    Control, opt-in
    With --allow-control, start and drive your own DeepSeek Harness sessions: messages, approvals, stop, model switch. Token-protected.
    
    
    
  
    

  
  
    
    
    
      
    
      
    
        
        
        
        
        
        
        
        
      
    
    
    
    
    
      
    
        
    meet tail
    
        
    The logo, come to life
    
      
    
      
      
        
    • It watches. The eye follows your pointer; left alone it glances at whatever the agent is busy with.
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    • It reacts. A hop when a command passes, a shake and a sweat drop when one fails, confetti when a turn ends.
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    • It thinks out loud. Dots rise into a bubble with a clock, the latest thought and some nonsense. Five silent minutes and it dozes off under a STALLED? warning.
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    • It plays. On a long think it plays one of ten games by itself. ▶ play hands you the controls: arrows and space, Esc to give them back, N for the next game.
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    • It likes pets. Not too fast.
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    ten games
    
      
    What Tail plays while the model thinks
    
      
    Each one is playing itself right now. Click one to take over; Esc hands it back.
    
    
    
    
    
  
    

  
  
    
    
    
      
    
        
    the whole team
    
        
    One pane per agent
    
      
    
      
      
        
    • A small agenttail each. Editor, console, scoreboard, TOK/S, context meter, and a Tail in the agent's colour.
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    • The stage follows the agent. Commands bring the console up; replies run as captions.
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    • Waiting is visible. waiting on the model with a clock, then stalled?. Quiet agents shrink.
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    • One tree for the team. Every file the agents touched, with a flash when two of them edit the same one.
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    The watch wall: three agents side by side, each with its own Tail, a shared file tree and a timeline
  
    

  
  
    
    
    
      
    seven themes
    
      
    Pick one. This page changes with it.
    
    
    
    
    
    The seven themes side by side: matrix, amber, red, ice, dracula, neon and paper
  
    

  
  
    
    
    
      
    stream mode
    
      
    
    
    
    
    
      
    
        
    safe to stream
    
        
    Your secrets stay yours
    
      
    
      
      
        
    • Read-only by default. It never writes to your agent's session store, workspace or transcripts.
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    • Localhost only. Binds to 127.0.0.1, with Host and Origin checks against DNS rebinding and CSRF.
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    • Stream mode is on by default. Keys, tokens, emails, user names, IPs and opaque ids are redacted on the server. It fails closed.
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    • No telemetry, no CDN. Fonts and editors are vendored; it works offline.
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    sources
    
      
    Reads the logs your agent already writes
    
    
    
    
    
      
    DeepSeek Harness
    ~/.dsh/sessions/**/session.v4.jsonl.zstd
    Edits, commands, background jobs, thinking, tokens and cost by peak band. Opt-in control.
    
      
    Claude Code
    ~/.claude/projects/**/*.jsonl
    Messages, thinking, tool calls, subagents, custom titles, turns, and what the tokens would cost on the API.
    
      
    Antigravity CLI
    ~/.gemini/antigravity/**
    Normalized messages, thinking, tool calls and file edits.
    
    
    
  
    

  
  
    
    
    
      
    get it
    
      
    Running in a minute
    
    
    
    
    
      
    
        
        
        
      
    
      
    
        
    Download agenttail-0.3.0-win-x64.exe from the latest release and run it. It opens the dashboard at http://127.0.0.1:8787. The exe is unsigned; check its SHA-256 against SHA256SUMS.txt.
    
        ⬇ Latest release