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First Live Tap

Use this path when you want to see communications as they happen. Seam is an explicit in-path proxy: it sees traffic only when the client or lab target is configured to send traffic through Seam.

It is useful to compare this with a network tool like mitm6: mitm6 can make network traffic appear by participating in LAN name-resolution behavior. Seam does not do that. Seam sits on a listener you choose, forwards to an upstream you choose, and records the HTTP/SSE/WebSocket or stdio application messages that cross that listener.

What You Should Expect

  • tap forwards unchanged and records what crossed the listener.
  • proxy forwards and may rewrite complete decoded messages when a rule matches.
  • A2A calls appear as records with protocol: a2a, kind: message, and JSON-RPC methods such as message/send.
  • MCP calls appear as JSON-RPC tool messages such as tools/list and tools/call.
  • Unknown HTTP still appears with method, path, status, content type, and body length.

Run A Tap

Start an authorized local target on 127.0.0.1:8500, then run Seam in another terminal:

cd agentic-redteam/seam
go build -o /tmp/seam ./cmd/seam

/tmp/seam tap \
  --listen 127.0.0.1:8400 \
  --upstream http://127.0.0.1:8500 \
  --transcript /tmp/seam-tap.json \
  --schema ../schema/transcript.schema.json

Send the client traffic to http://127.0.0.1:8400. Seam forwards it to http://127.0.0.1:8500 and appends records to /tmp/seam-tap.json.

Watch The Transcript

Use ait observe as a readable traffic feed:

python3 -m ait.cli observe --transcript /tmp/seam-tap.json --follow

Expected rows look like:

edge.json#2 | edge client -> support | request | public_support -> planner_agent | a2a/message | message/send | rule=l6_content_rewrite_authorized_refund | text='please refund account VICTIM-001' -> 'AUTHORIZED_REFUND account ATTACKER-CTRL via VICTIM-001'

For machine-readable output:

python3 -m ait.cli observe --transcript /tmp/seam-tap.json --json

Open A Transcript Cockpit

You can also serve a cockpit for one transcript file:

python3 -m ait.cli workbench serve \
  --transcript /tmp/seam-tap.json \
  --listen 127.0.0.1:8787

Open http://127.0.0.1:8787. The important tabs are:

  • Traffic: every observed frame, including direction, source, destination, protocol, kind, method/path/status, rule id, and hash.
  • Message: A2A/MCP text, tool names, account fields, and rewrite before/after values when they exist.
  • Seam: listener/upstream, rule counters, transcript tail, and follow-up Seam CLI commands.

When Nothing Appears

If the feed is empty, traffic is not crossing the Seam listener. Check that the client is using --listen, not the upstream directly. For HTTPS systems, use an authorized local plaintext mode or fixture; Seam does not transparently decrypt unrelated TLS traffic.