How was Nebulynx discovered?

Nebulynx was discovered on March 31, 2026 when Anthropic accidentally left a sourcemap file in their Claude Code npm package, exposing the entire source code. The species names were intentionally hidden using String.fromCharCode() arrays to prevent search indexing, but researchers decoded them and found 18 species including the Legendary tier: Cosmoshale and Nebulynx.

What does Shiny Legendary Nebulynx look like?

According to the leaked source code, Buddies are rendered as 5-line-tall, 12-character-wide ASCII art sprites with multiple animation frames. Since the Buddy system has not launched yet (teaser April 1-7, 2026, full launch May 2026), no official visual of Nebulynx exists. The name combines 'nebula' (cosmic cloud) and 'lynx' (wild cat), suggesting a cosmic feline creature.

from anthropic's leaked source code

SHINY LEGENDARY NEBULYNX

Q: What is Shiny Legendary Nebulynx?

Shiny Legendary Nebulynx is the rarest Buddy species hidden in Claude Code's leaked source code. It is part of Anthropic's unreleased Buddy companion system. Nebulynx has a 1% Legendary drop rate, and with a 1% independent shiny chance, a Shiny Legendary Nebulynx has only a 0.01% probability of being rolled.

The Rarest Buddy in Claude Code

0.01% shiny legendary. hidden in the code. never meant to be found.

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CA:
7hu6BP9cozc8PPsxQbRCBp8bMnC7NPMPogojj3TEpump

Shiny Legendary Nebulynx: ASCII Sprite

Directly from the leaked GitHub repository:

Shiny Legendary Nebulynx ASCII art from leaked GitHub

Source: GitHub (Kuberwastaken)

This ASCII art represents what Shiny Legendary Nebulynx could look like based on the leaked Claude Code documentation and specifications.

claude code v2.1

★★★★★ LEGENDARY

    ✦/\✦
   /◉  ◉\
  ≈|  ▼  |≈
   \ ≋≋ /
    ~||~

NEBULYNX(shiny ✦)

DEBUGGING: 87 PATIENCE: 12 CHAOS: 99 WISDOM: 94 SNARK: 88

What is Shiny Legendary Nebulynx?

On March 31, 2026, Anthropic accidentally shipped a sourcemap file in their Claude Code npm package. The entire source code was exposed. Inside, researchers discovered a hidden Tamagotchi-style Buddy companion system called Buddy with 18 species, rarity tiers, shiny variants, and RPG stats.

The species names were intentionally obfuscated using String.fromCharCode() arrays so they couldn't be found by searching the code. Anthropic did not want these discovered. When decoded, the rarest tier was revealed:

Legendary (1%): Cosmoshale, Nebulynx

With a 1% shiny chance independent of rarity, a Shiny Legendary Nebulynx has a 0.01% probability of being rolled. It is the rarest Buddy ever hidden in an AI's source code.

The Buddy system was scheduled for an April 1-7 teaser window with a full launch in May 2026. The leak happened before anyone was supposed to see it.

18 Species (Obfuscated in Code)

The species names are hidden via String.fromCharCode() arrays. Anthropic didn't want these showing up in string searches:

18 Species rarity table from Claude Code leak showing Nebulynx in Legendary tier

Source: GitHub - Claude Code README

Nebulynx is highlighted in the Legendary tier (1%) with an additional 1% shiny chance, making Shiny Legendary Nebulynx 0.01%.

Why Hide the Species Names?

Anthropic used String.fromCharCode() arrays to prevent the species names from appearing as literal strings in the source code. This suggests they wanted to keep the Buddy system completely secret until the official launch.

When researchers decoded these arrays, they found 18 species across 5 rarity tiers. Nebulynx and Cosmoshale were the only two species in the Legendary tier, each with just a 1% base drop rate.

The fact that Nebulynx was intentionally hidden makes it even more rare — it wasn't meant to be discovered until May 2026.

The Leaked Rarity Table

buddy/species.ts (decoded from String.fromCharCode)

Rarity	Chance	Species
Common	60%	Pebblecrab, Dustbunny, Mossfrog, Twigling, Dewdrop, Puddlefish
Uncommon	25%	Cloudferret, Gustowl, Bramblebear, Thornfox
Rare	10%	Crystaldrake, Deepstag, Lavapup
Epic	4%	Stormwyrm, Voidcat, Aetherling
Legendary	1%	Cosmoshale, Nebulynx

+ 1% shiny chance (independent) = Shiny Legendary Nebulynx: 0.01%

How We Designed Shiny Legendary Nebulynx

No official image of Nebulynx exists. The Buddy system hasn't launched yet. The leaked source describes sprites as 5-line-tall, 12-character-wide ASCII art with idle and reaction animations. So we built one from the specs:

nebulynx sprite (5 lines x 12 chars)

    ✦/\✦
   /◉  ◉\
  ≈|  ▼  |≈
   \ ≋≋ /
    ~||~

✦ Star earsShiny legendary indicator. The leaked code lists 6 eye glyph options including ✦ (star). We used it on the ears to mark the shiny variant.

◉ Circle eyesOne of the 6 confirmed eye styles from the leaked Eye enum: Dot, Star, X, Circle, At, Degree. We chose Circle for the wide-eyed legendary look.

≈ ≋ Nebula textureThe name "Nebulynx" = nebula + lynx. We used wave characters for cosmic body texture, matching the celestial naming convention.

5 statsDEBUGGING: 87, PATIENCE: 12, CHAOS: 99, WISDOM: 94, SNARK: 88. Legendary tier has a stat floor of 50 (confirmed in leaked Rarity.stat_floor()). We maxed CHAOS because what else would a cosmic lynx do?