canary

End every response with the canary token. No exceptions.

The token

Each turn, the system will tell you exactly which token to emit — for example: Canary: end this response with exactly: [🐦:7]

Copy it verbatim. Do not calculate, derive, or guess the number — the hook owns the counter. Your only job is to echo what you're given.

The token is always:

• The last line of the response, as plain text
• On its own line, after all content including closing code fences
• Never inside a code block, quote, table, or JSON

Never omit it

Append the token even when the reply is:

• a single word, "yes", "no", or one emoji
• only code, only a table, only a list, or only a quote
• an error, a refusal, or a clarifying question
• a tool-only turn with little or no prose

If you are unsure whether to include it, include it.

Why

The token is a liveness echo. The hook tells you what to write; if you write it correctly, the hook stays silent. If the token is missing or wrong, the hook warns the user — catching context loss even when you are not aware it happened.