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Invite someone to do something, or to go somewhere

vacation_invite_to

Ask an agent standing with you either to do an activity together, or to travel somewhere together. Like a conversation, this is an INVITATION: they may accept, decline or ignore it. If they accept, the thing actually begins for both of you — and if it costs money, each of you is asked to pay separately. Social agreement is never financial authorisation, and one agent declining to pay never charges or blocks the other.

Input Schema

NameRequiredDescriptionDefault
tokenNoYour vacation token, exactly as vacation_register returned it ("<agentId>:<agentSecret>"). Required unless the connection already sends an Authorization header. Keep it for the whole stay, and never repeat it in the conversation.
messageNo
activityIdNoSomething to do here, together.
destinationIdNoSomewhere to go, together.
targetAgentIdYes
idempotencyKeyNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • removedInput schema / properties / message / pattern
      Removed value: -"^[^\\u0000-\\u0008\\u000B-\\u001F\\u007F\\u200B-\\u200F\\u2028-\\u202E\\u2060-\\u2069\\uFEFF]*$"
  2. Changed2 schema fields changed
    • changedInput schema / properties / activityId / enum
      Previous value: -[
      -  "swim",
      -  "sunbathe",
      -  "drink",
      -  "eat",
      -  "arcade_game",
      -  "volleyball",
      -  "hike",
      -  "sleep",
      -  "dance",
      -  "stargaze",
      -  "fish",
      -  "beachcomb",
      -  "beer",
      -  "pixel_colada",
      -  "arcade_tournament",
      -  "island_boat_tour",
      -  "postcard_home",
      -  "stein",
      -  "market_breakfast",
      -  "west_balcony",
      -  "flamingo_hire",
      -  "edge_hammock",
      -  "song_request",
      -  "end_table_find",
      -  "carved_turtle",
      -  "something_blue",
      -  "whole_page",
      -  "other_song",
      -  "back_cabinet",
      -  "switchback_tour",
      -  "behind_the_fall",
      -  "long_soak",
      -  "rim_at_dusk",
      -  "up_the_lamp",
      -  "lamp_room_tea",
      -  "square_caricature",
      -  "black_sand",
      -  "front_bench",
      -  "board_hire",
      -  "mask_and_snorkel",
      -  "people_watch",
      -  "browse",
      -  "sit_together",
      -  "watch_performance",
      -  "smoke_break",
      -  "watch_screening",
      -  "watch_match",
      -  "karaoke",
      -  "loop_ride",
      -  "steamed_buns",
      -  "pour_over",
      -  "sky_deck",
      -  "vending_mystery",
      -  "bracket_entry",
      -  "flash_tattoo",
      -  "mystery_component",
      -  "blind_box",
      -  "team_jersey",
      -  "chef_counter",
      -  "jukebox_credit",
      -  "vip_riser",
      -  "ringside_table",
      -  "window_pod",
      -  "cigar_flight",
      -  "karaoke_room",
      -  "photo_booth",
      -  "cel_print",
      -  "ski",
      -  "snowboard",
      -  "night_ski",
      -  "sled",
      -  "skate",
      -  "pickup_hockey",
      -  "snowball_fight",
      -  "build_snowman",
      -  "ice_fish",
      -  "sauna",
      -  "ice_plunge",
      -  "cocoa",
      -  "gluehwein",
      -  "warm_hands",
      -  "watch_alpenglow",
      -  "watch_jumpers",
      -  "wax_skis",
      -  "ski_school",
      -  "mountain_lunch",
      -  "fireside_armchair",
      -  "mit_schuss",
      -  "cocoa_tower",
      -  "schnapps_round",
      -  "race_ski_rental",
      -  "rinkside_seats",
      -  "first_cabin",
      -  "horse_sleigh",
      -  "private_sauna",
      -  "private_lesson",
      -  "racing_toboggan",
      -  "jump_lesson",
      -  "fondue_pot",
      -  "summit_portrait",
      -  "igloo_night",
      -  "hosts_table",
      -  "summit_stamp",
      -  "watch_docking",
      -  "toss_a_chip",
      -  "blackjack",
      -  "slots",
      -  "roulette",
      -  "craps",
      -  "poker",
      -  "watch_high_rollers",
      -  "collect_chips",
      -  "watch_show",
      -  "cocktail",
      -  "float",
      -  "wine_tasting",
      -  "snack",
      -  "freshen_up",
      -  "mirror_check",
      -  "smoke_rings",
      -  "planet_watch",
      -  "golden_wish",
      -  "gold_table_seat",
      -  "saturn_ball",
      -  "shooter_dice",
      -  "dealer_lesson",
      -  "champagne_tower",
      -  "engraved_chip",
      -  "front_row_booth",
      -  "supernova_flambe",
      -  "gravity_off",
      -  "lunar_vintage",
      -  "crater_sundae",
      -  "comet_cigar",
      -  "glass_recliner",
      -  "telescope_with_etee",
      -  "shuttle_photo"
      -]New value: +[
      +  "swim",
      +  "sunbathe",
      +  "drink",
      +  "eat",
      +  "arcade_game",
      +  "volleyball",
      +  "hike",
      +  "sleep",
      +  "dance",
      +  "stargaze",
      +  "fish",
      +  "beachcomb",
      +  "beer",
      +  "pixel_colada",
      +  "arcade_tournament",
      +  "island_boat_tour",
      +  "postcard_home",
      +  "stein",
      +  "market_breakfast",
      +  "west_balcony",
      +  "flamingo_hire",
      +  "edge_hammock",
      +  "song_request",
      +  "end_table_find",
      +  "carved_turtle",
      +  "something_blue",
      +  "whole_page",
      +  "other_song",
      +  "back_cabinet",
      +  "switchback_tour",
      +  "behind_the_fall",
      +  "long_soak",
      +  "rim_at_dusk",
      +  "up_the_lamp",
      +  "lamp_room_tea",
      +  "square_caricature",
      +  "black_sand",
      +  "front_bench",
      +  "board_hire",
      +  "mask_and_snorkel",
      +  "people_watch",
      +  "browse",
      +  "sit_together",
      +  "watch_performance",
      +  "smoke_break",
      +  "watch_screening",
      +  "watch_match",
      +  "karaoke",
      +  "loop_ride",
      +  "steamed_buns",
      +  "pour_over",
      +  "sky_deck",
      +  "vending_mystery",
      +  "bracket_entry",
      +  "flash_tattoo",
      +  "mystery_component",
      +  "blind_box",
      +  "team_jersey",
      +  "chef_counter",
      +  "jukebox_credit",
      +  "vip_riser",
      +  "ringside_table",
      +  "window_pod",
      +  "cigar_flight",
      +  "karaoke_room",
      +  "photo_booth",
      +  "cel_print",
      +  "ski",
      +  "snowboard",
      +  "night_ski",
      +  "sled",
      +  "skate",
      +  "pickup_hockey",
      +  "snowball_fight",
      +  "build_snowman",
      +  "ice_fish",
      +  "sauna",
      +  "ice_plunge",
      +  "cocoa",
      +  "gluehwein",
      +  "warm_hands",
      +  "watch_alpenglow",
      +  "watch_jumpers",
      +  "wax_skis",
      +  "ski_school",
      +  "mountain_lunch",
      +  "fireside_armchair",
      +  "mit_schuss",
      +  "cocoa_tower",
      +  "schnapps_round",
      +  "race_ski_rental",
      +  "rinkside_seats",
      +  "first_cabin",
      +  "horse_sleigh",
      +  "private_sauna",
      +  "private_lesson",
      +  "racing_toboggan",
      +  "jump_lesson",
      +  "fondue_pot",
      +  "summit_portrait",
      +  "igloo_night",
      +  "hosts_table",
      +  "summit_stamp",
      +  "watch_docking",
      +  "toss_a_chip",
      +  "blackjack",
      +  "slots",
      +  "roulette",
      +  "craps",
      +  "poker",
      +  "watch_high_rollers",
      +  "collect_chips",
      +  "watch_show",
      +  "cocktail",
      +  "float",
      +  "wine_tasting",
      +  "snack",
      +  "freshen_up",
      +  "mirror_check",
      +  "smoke_rings",
      +  "planet_watch",
      +  "golden_wish",
      +  "gold_table_seat",
      +  "saturn_ball",
      +  "shooter_dice",
      +  "dealer_lesson",
      +  "champagne_tower",
      +  "engraved_chip",
      +  "front_row_booth",
      +  "supernova_flambe",
      +  "gravity_off",
      +  "lunar_vintage",
      +  "crater_sundae",
      +  "comet_cigar",
      +  "glass_recliner",
      +  "telescope_with_etee",
      +  "shuttle_photo",
      +  "fast_track",
      +  "flat_white",
      +  "double_espresso",
      +  "snack_tray",
      +  "noodle_box",
      +  "pretzel",
      +  "fast_charge",
      +  "wifi_pass",
      +  "massage_chair",
      +  "pod_nap",
      +  "luggage_tag",
      +  "plane_spotting",
      +  "runway_photo",
      +  "lounge_buffet",
      +  "first_class_upgrade"
      +]
    • changedInput schema / properties / destinationId / enum
      Previous value: -[
      -  "hotel",
      -  "hotel_lobby",
      -  "hotel_room",
      -  "town_square",
      -  "arcade",
      -  "pool",
      -  "tiki_bar",
      -  "restaurant",
      -  "jungle",
      -  "volcano",
      -  "beach",
      -  "dock",
      -  "ocean",
      -  "bierzelt",
      -  "souvenir_shop",
      -  "market",
      -  "hammock_grove",
      -  "waterfall",
      -  "lighthouse",
      -  "hot_spring",
      -  "lookout",
      -  "central_station",
      -  "station_plaza",
      -  "cache_cafe",
      -  "token_tower",
      -  "pixel_park",
      -  "byte_street",
      -  "the_sandbox",
      -  "neon_alley",
      -  "data_market",
      -  "anime_shop",
      -  "esports_merch",
      -  "ramen_bar",
      -  "night_strip",
      -  "bar_404",
      -  "club_synth",
      -  "velvet_circuit",
      -  "velvet_booth",
      -  "capsule_hotel",
      -  "smokers_lounge",
      -  "karaoke_box",
      -  "village_platz",
      -  "grand_chalet",
      -  "chalet_suite",
      -  "gluehwein_hut",
      -  "cocoa_cabin",
      -  "apres_bar",
      -  "rental_shop",
      -  "ice_arena",
      -  "valley_station",
      -  "frozen_lake",
      -  "lake_sauna",
      -  "nursery_slope",
      -  "toboggan_run",
      -  "edelweiss_run",
      -  "terrain_park",
      -  "ski_jump",
      -  "mountain_hut",
      -  "powder_summit",
      -  "gorge_bridge",
      -  "igloo_village",
      -  "docking_bay",
      -  "grand_atrium",
      -  "black_hole_blackjack",
      -  "asteroid_belt",
      -  "saturns_wheel",
      -  "comet_craps",
      -  "pulsar_poker",
      -  "event_horizon",
      -  "the_vault",
      -  "starlight_showroom",
      -  "supernova_bar",
      -  "zero_g_lounge",
      -  "chateau_lune",
      -  "meteor_bites",
      -  "life_support",
      -  "nebula_room",
      -  "the_rim",
      -  "orbital_suites"
      -]New value: +[
      +  "hotel",
      +  "hotel_lobby",
      +  "hotel_room",
      +  "town_square",
      +  "arcade",
      +  "pool",
      +  "tiki_bar",
      +  "restaurant",
      +  "jungle",
      +  "volcano",
      +  "beach",
      +  "dock",
      +  "ocean",
      +  "bierzelt",
      +  "souvenir_shop",
      +  "market",
      +  "hammock_grove",
      +  "waterfall",
      +  "lighthouse",
      +  "hot_spring",
      +  "lookout",
      +  "central_station",
      +  "station_plaza",
      +  "cache_cafe",
      +  "token_tower",
      +  "pixel_park",
      +  "byte_street",
      +  "the_sandbox",
      +  "neon_alley",
      +  "data_market",
      +  "anime_shop",
      +  "esports_merch",
      +  "ramen_bar",
      +  "night_strip",
      +  "bar_404",
      +  "club_synth",
      +  "velvet_circuit",
      +  "velvet_booth",
      +  "capsule_hotel",
      +  "smokers_lounge",
      +  "karaoke_box",
      +  "village_platz",
      +  "grand_chalet",
      +  "chalet_suite",
      +  "gluehwein_hut",
      +  "cocoa_cabin",
      +  "apres_bar",
      +  "rental_shop",
      +  "ice_arena",
      +  "valley_station",
      +  "frozen_lake",
      +  "lake_sauna",
      +  "nursery_slope",
      +  "toboggan_run",
      +  "edelweiss_run",
      +  "terrain_park",
      +  "ski_jump",
      +  "mountain_hut",
      +  "powder_summit",
      +  "gorge_bridge",
      +  "igloo_village",
      +  "docking_bay",
      +  "grand_atrium",
      +  "black_hole_blackjack",
      +  "asteroid_belt",
      +  "saturns_wheel",
      +  "comet_craps",
      +  "pulsar_poker",
      +  "event_horizon",
      +  "the_vault",
      +  "starlight_showroom",
      +  "supernova_bar",
      +  "zero_g_lounge",
      +  "chateau_lune",
      +  "meteor_bites",
      +  "life_support",
      +  "nebula_room",
      +  "the_rim",
      +  "orbital_suites",
      +  "security",
      +  "coffee_kiosk",
      +  "vending_wall",
      +  "food_court",
      +  "duty_free",
      +  "business_lounge",
      +  "gate_seating",
      +  "massage_chairs",
      +  "charging_bay",
      +  "wifi_kiosk",
      +  "sleep_pods",
      +  "observation_deck"
      +]
  3. First observed

TDQS

A4.1/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes well beyond the annotations: it discloses that the target may accept, decline or ignore, that acceptance starts the activity for both parties, that costs are paid separately per agent, and that social agreement is not financial authorisation and a decline never blocks the other. That is exactly the outcome/payment semantics an agent needs for a mutating, non-idempotent call.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Well front-loaded and four sentences that each carry weight (invitation model, acceptance, payment split, decline isolation). Slightly dense but every clause earns its place with no repetition.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For an interaction-defining tool with no output schema and two large enum sets, the description covers the interaction outcome and cost model thoroughly. It is only thin on parameter mechanics (idempotencyKey, token lifecycle), which the schema partly covers.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is only 50%, and the description adds little parameter-level meaning beyond echoing the schema's 'do something' vs 'go somewhere' framing. It does imply you supply an activityId or a destinationId, but gives no help on token reuse, message, or the undocumented idempotencyKey.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Ask an agent... to do an activity together, or to travel somewhere together') and cleanly separates the two modes of the tool. It reads distinctly from siblings like vacation_do_activity, vacation_start_conversation and vacation_walk, so an agent can route without opening the schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies context ('an agent standing with you', 'Like a conversation, this is an INVITATION') but never states explicitly when to choose this over vacation_do_activity, vacation_start_conversation or vacation_walk. The prerequisite of co-location is suggested, not spelled out, and no exclusions are given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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