level-up

name	level-up
description	Level up the active D&D 5e character by one level. Trigger when the player or DM marks a level-up beat (milestone reached or XP threshold crossed). Updates HP, hit dice, class/subclass features, ASI/feats, spell slots, spells known/prepared, proficiency bonus, and derived stats; appends to the character's level history.

Level Up

Advance the active character one level using the official 2014 ruleset and the active class's level table. Cap at level 20.

Per AGENTS.md, batch the level's structured choices into a single AskUserQuestion call once you've walked the class table and know what's pending. A typical Paladin/Fighter/Cleric level-up has 1–4 discrete picks: HP method (roll vs average), Fighting Style (when granted), ASI vs feat (L4/L8/L12/L16/L19), new cantrips, swapped/added known spells, prepared-spell additions for prepared casters. Bundle these — don't ask one per turn. For pick-N choices (two cantrips, two prepared spells), set multiSelect: true. The "Other" escape hatch lets the player pick from the full list if your curated 2–4 misses their target.

0. Prerequisites

• mise --version, mise run roll -- 1d20.
• Determine campaign slug + active character (state.md).

1. Validate

Read campaigns/<slug>/characters/<active>.md. Note the current level. Refuse if the character is already level 20.

If the campaign uses XP pacing (per campaign.md), confirm the character has crossed the next threshold. If milestone, trust the trigger.

2. Walk the Class Table

Set new_level = current + 1. Read the class's level table (and subclass, if relevant) for new_level. Identify:

• New class features at this level.
• Subclass feature at this level (if any).
• ASI / feat at L4, L8, L12, L16, L19 (most classes — Fighter also gets bonus ASIs at L6 and L14; Rogue at L10).
• Proficiency bonus changes at L5 (+3), L9 (+4), L13 (+5), L17 (+6).
• Spellcasters: new spell slots, cantrips known, spells known/prepared per the class table.

3. HP Increase

Two paths, per house rules:

• Roll: mise run roll -- 1d<hit-die>, add CON modifier (minimum +1 HP).
• Average: take the fixed average for the hit die (d6=4, d8=5, d10=6, d12=7), add CON modifier (minimum +1 HP).

Show the choice and result. Apply to max HP and current HP. If rolling, accept the result — no rerolls (PHB rule).

4. ASI / Feat (if applicable)

If this level grants an ASI:

• Two options: +2 to one ability (cap 20) or +1 to two abilities, OR a feat from any official source the campaign allows.
• If a feat changes ability scores, derived stats, proficiencies, or attacks, propagate through the sheet.

5. Spells (if applicable)

For spellcasters:

• Add cantrips per the class table (Wizards, Clerics, Bards, Druids, Sorcerers, Warlocks).
• Spells known: Sorcerer / Bard / Warlock / Ranger may swap one known spell of any level they could cast.
• Prepared casters (Cleric, Druid, Paladin, Wizard): preparation count recomputes at the next long rest; spell slots update now.
• Recompute spell save DC and attack bonus only if proficiency or spellcasting ability changed.

6. Apply & Recompute

Update the character sheet, section by section:

• Identity block: level → new_level.
• Combat: HP, hit dice (<level>d<die>), proficiency bonus.
• Saving throws / skills: recompute bonuses if proficiency bonus changed.
• Attacks & spellcasting: spell save DC, spell attack bonus, weapon attack bonuses.
• Features & Traits: append the new ones with their source (PHB / Tasha's / etc.).
• Level History: append a row.

7. Persist

Save the character sheet immediately (per AGENTS.md Live Persistence). If a session is open, append a beat to sessions/<NNN>.md recording the level-up.

Every file written must follow the File Conventions in AGENTS.md (final newline, LF, UTF-8, no trailing whitespace).

8. Confirm

Read back: new level, HP delta, new features, ASI / feat (if any), updated spell slots. Ask if the player wants to adjust any of the choices before saving the final state.