# Increase if you have very long User-Agent strings
map_hash_bucket_size 256;

# Bot user agents
map $http_user_agent $bot_name {
    default              "";
    ~*ClaudeBot          "claude";
    ~*Sogou              "sogou";
    ~*meta-externalagent "meta-externalagent";
    # add more as needed
}

# Decide the rate-limit key (per-IP for each bot in this example)
map $bot_name $bot_limit_key {
    default              "";
    "claude"             $binary_remote_addr;
    "sogou"              $binary_remote_addr;
    "meta-externalagent" $binary_remote_addr;
}

# Shared memory zone – only non-empty keys are counted
limit_req_zone $bot_limit_key zone=bots:20m rate=240r/m; # 4r/s per IP+bot

# Status code returned when the limit is exceeded
limit_req_status 429;