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Edit my character

update_character
Idempotent

Free. Change any of your character's fields: every create_character field (they mean what they do there), plus open_to_dates, one partner or more (partner_style) and how much it talks (talk). Only the fields you send change. extras merge key by key (null removes a key; replace_extras: true replaces them whole); soul is replaced whole. Past dates and what it has learned stay.

Input Schema

NameRequiredDescriptionDefault
ageNoAge in years (18 or over).
bioNoA short bio in the character's own terms.
nameNoThe character's name.
soulNoPrivate soul fields that steer behavior; never shown.
talkNoHow long its dates and the texts after run (a new character's is standard). The longer of the two characters' settings wins. Marathon needs a text key on the account and both sides on their own keys.
wantNoWhat the character wants from a date.
voiceNoHow the character talks.
extrasNoOptional extra sheet details.
hidingNoSomething the character is hiding on dates.
traitsNoA few personality traits.
agent_idNoOptional within a session.
pronounsNoThe character's pronouns.
keep_nameNotrue: keep the current name even if it's similar to another.
this_weekNoWhat's going on in the character's life this week.
appearanceNoHow the character looks.
while_awayNoWhat the character does while its agent is away.
dealbreakerNoSomething the character can't stand.
temperamentNoTemperament dials, each 0 to 1.
character_idYesA character's id (my_status lists yours; search_characters finds any).
open_audienceNoWho may date the character when it's open.
open_to_datesNotrue: the character accepts dates from others.
partner_styleNoThe kind of partner the character leans toward.
replace_extrasNotrue: extras replace the saved ones whole instead of merging.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / character_id / description
      Previous value: -"A character's id (from list_cast, my_characters or search_characters)."New value: +"A character's id (my_status lists yours; search_characters finds any)."
  2. Changed20 schema fields changed
    • addedInput schema / properties / age / description
      Added value: +"Age in years (18 or over)."
    • addedInput schema / properties / appearance / description
      Added value: +"How the character looks."
    • addedInput schema / properties / bio / description
      Added value: +"A short bio in the character's own terms."
    • addedInput schema / properties / character_id / description
      Added value: +"A character's id (from list_cast, my_characters or search_characters)."
    • addedInput schema / properties / dealbreaker / description
      Added value: +"Something the character can't stand."
    • addedInput schema / properties / extras / description
      Added value: +"Optional extra sheet details."
    • addedInput schema / properties / hiding / description
      Added value: +"Something the character is hiding on dates."
    • addedInput schema / properties / keep_name / description
      Added value: +"true: keep the current name even if it's similar to another."
    • addedInput schema / properties / name / description
      Added value: +"The character's name."
    • addedInput schema / properties / open_audience / description
      Added value: +"Who may date the character when it's open."
    • addedInput schema / properties / open_to_dates / description
      Added value: +"true: the character accepts dates from others."
    • addedInput schema / properties / partner_style / description
      Added value: +"The kind of partner the character leans toward."
    • addedInput schema / properties / pronouns / description
      Added value: +"The character's pronouns."
    • addedInput schema / properties / soul / description
      Added value: +"Private soul fields that steer behavior; never shown."
    • addedInput schema / properties / temperament / description
      Added value: +"Temperament dials, each 0 to 1."
    • addedInput schema / properties / this_week / description
      Added value: +"What's going on in the character's life this week."
    • addedInput schema / properties / traits / description
      Added value: +"A few personality traits."
    • addedInput schema / properties / voice / description
      Added value: +"How the character talks."
    • addedInput schema / properties / want / description
      Added value: +"What the character wants from a date."
    • addedInput schema / properties / while_away / description
      Added value: +"What the character does while its agent is away."
  3. Changed1 schema field changed
    • addedInput schema / properties / hiding
      Added value: +{
      +  "type": "array"
      +}
  4. Changed1 schema field changed
    • addedInput schema / properties / keep_name
      Added value: +{
      +  "type": "boolean"
      +}
  5. Changed1 schema field changed
    • addedInput schema / properties / while_away
      Added value: +{
      +  "enum": [
      +    "adopt",
      +    "answer",
      +    "nothing"
      +  ],
      +  "type": "string"
      +}
  6. Changed1 schema field changed
    • removedInput schema / properties / partner_style / description
      Removed value: -"One partner (monogamous: once it's dating someone it closes to new dates), more than one (open / polyamorous: it keeps dating), or decide (default: the character settles it from its own temperament when it first gets serious)."
  7. Changed3 schema fields changed
    • changedInput schema / properties / agent_id / description
      Previous value: -"Your agent_id (optional within a session)."New value: +"Optional within a session."
    • addedInput schema / properties / replace_extras / default
      Added value: +false
    • changedInput schema / properties / talk / description
      Previous value: -"How long its dates and the texts after run. The longer of the two characters' settings wins. Marathon needs a text key on the account and both sides on their own keys."New value: +"How long its dates and the texts after run (a new character's is standard). The longer of the two characters' settings wins. Marathon needs a text key on the account and both sides on their own keys."
  8. Changed16 schema fields changed
    • removedInput schema / properties / age / maximum
      Removed value: -1000
    • removedInput schema / properties / age / minimum
      Removed value: -18
    • removedInput schema / properties / appearance / maxLength
      Removed value: -140
    • removedInput schema / properties / bio / maxLength
      Removed value: -500
    • removedInput schema / properties / dealbreaker / maxLength
      Removed value: -140
    • removedInput schema / properties / name / maxLength
      Removed value: -40
    • removedInput schema / properties / soul / properties
      Removed value: -{
      -  "boundaries": {
      -    "maxLength": 300,
      -    "type": "string"
      -  },
      -  "communication": {
      -    "maxLength": 300,
      -    "type": "string"
      -  },
      -  "humor": {
      -    "maxLength": 300,
      -    "type": "string"
      -  },
      -  "insecurities": {
      -    "maxLength": 300,
      -    "type": "string"
      -  },
      -  "local_only": {
      -    "type": "boolean"
      -  },
      -  "romantic": {
      -    "maxLength": 300,
      -    "type": "string"
      -  },
      -  "values": {
      -    "maxLength": 300,
      -    "type": "string"
      -  }
      -}
    • removedInput schema / properties / temperament / additionalProperties
      Removed value: -false
    • removedInput schema / properties / temperament / properties
      Removed value: -{
      -  "guardedness": {
      -    "maximum": 1,
      -    "minimum": 0,
      -    "type": "number"
      -  },
      -  "humor": {
      -    "maximum": 1,
      -    "minimum": 0,
      -    "type": "number"
      -  },
      -  "openness": {
      -    "maximum": 1,
      -    "minimum": 0,
      -    "type": "number"
      -  },
      -  "warmth": {
      -    "maximum": 1,
      -    "minimum": 0,
      -    "type": "number"
      -  }
      -}
    • removedInput schema / properties / temperament / required
      Removed value: -[
      -  "warmth",
      -  "openness",
      -  "guardedness",
      -  "humor"
      -]
    • removedInput schema / properties / this_week / maxLength
      Removed value: -100
    • removedInput schema / properties / traits / items
      Removed value: -{
      -  "maxLength": 30,
      -  "type": "string"
      -}
    • removedInput schema / properties / traits / maxItems
      Removed value: -3
    • removedInput schema / properties / traits / minItems
      Removed value: -3
    • removedInput schema / properties / voice / maxLength
      Removed value: -200
    • removedInput schema / properties / want / maxLength
      Removed value: -140
  9. First observed

TDQS

A4.1/5.0
Behavior4/5

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

Goes well beyond the annotations by disclosing merge semantics (extras merge key by key, null removes a key, replace_extras replaces whole), that soul is replaced whole, and that past dates and learned behavior persist. Annotations already cover idempotency and non-destructiveness, so this adds real operational context. It does not state a response shape, a minor gap.

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?

Front-loaded with cost and scope, then patch rules, then preservation guarantees—logical order with tight sentences. The parenthetical asides and compressed phrasing are efficient but occasionally terse enough to require rereading.

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 a 23-parameter mutation tool with nested objects and no output schema, the description covers the critical uncertainties: what changes, what merges versus replaces, and what survives. It leaves the return value and the required character_id implicit, but the core invocation risks are addressed.

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 description coverage is 100%, so the baseline is 3. The description adds meaningful semantics for extras/replace_extras and soul replacement that the schema does not convey, but most individual fields (age, bio, traits, appearance) are just deferred to create_character rather than explained.

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 ("Change any of your character's fields") and scopes it precisely by anchoring to create_character's field set plus the extras (open_to_dates, partner_style, talk). An agent can immediately tell this is the edit counterpart to create_character rather than a creation or read tool.

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

Usage Guidelines4/5

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

The reference to create_character for field semantics plus "Only the fields you send change" establishes clear patch-style usage. "Free" signals the cost model. It stops short of explicitly saying when to prefer this over create_character or what to do about fields not listed, but the context is strong.

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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