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install runs the system ssh and hands the host a short shell script to run, with the public key line on the connection's standard input rather than on a command line, where anyone else on the host could read it out of the process list. The script makes ~/.ssh and authorized_keys if they are missing, adds the line unless the same line is already there, and says which of the two it did. to serves the key from an agent inside the tool, on a unix socket in a temporary directory only its owner can enter, and points ssh at it with -o IdentityAgent. The socket and directory go when the command ends and the private key is never written to disk. Only this command hands back the status ssh ended with instead of ending with status 1. The tests put a stand-in ssh on the path: for install it runs the script the tool sends against a directory standing in for the host's home directory, so the file, the modes and the second run that changes nothing are all watched happening. Model: opus-5