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Destiny Codex

by OpenChatGit

Destiny Codex

Version 0.3.7.0 (07.01.2026)

Turn the Destiny 2 Manifest (gibberish hash-reference JSON) into clean, AI-readable text — with full relationship traversal, structured filtering, item comparison, and weapon perk-roll extraction.

Destiny Codex is a CLI tool and an MCP server. It works for 100% of the manifest — every definition table is supported generically. Hash references are resolved into human-readable names automatically, in both directions.

What's New in 0.3.7.0

  • Weapon Perk Rolls (codex rolls) — Shows all possible perks a weapon can roll, grouped by socket column (barrel, mag, traits, mods, catalyst). Marks each perk as default, random, or fixed.

  • Reverse Perk Search (codex perksearch / codex perks) — Find all weapons that can roll a given perk. The inverse of rolls: "which weapons can roll Incandescent?"

  • Multi-Language Support — 14 languages via codex config set-language <lang>. German, French, Spanish, Japanese, and more.

  • Auto-Update Check — Warns when the manifest is older than 7 days (Bungie updates weekly).

  • Test Suite — 50 vitest tests covering resolver, formatter, filter, and compare modules.

  • Formatter BugfixdisplayProperties.icon was not being skipped despite being in the skip list.

  • PolyForm Noncommercial License — This software may never be used for commercial purposes.

Related MCP server: nexus-mcp

Quick Start

# 1. Install
npm install
npm run build

# 2. Add your Bungie API key (get one at https://www.bungie.net/en/Application)
cp .env.example .env
# Edit .env: BUNGIE_API_KEY=your_key_here

# 3. (Optional) Set your preferred language (default: en)
codex config set-language de    # German, French, Spanish, Japanese, etc.

# 4. Download the manifest + build indexes
node dist/index.js sync
node dist/index.js index

# 5. Use it
node dist/index.js item Gjallarhorn

Or save the API key persistently:

node dist/index.js config set-key your_key_here

CLI Commands

Command

Description

codex item <name>

Look up an item by name, show full readable definition. Picks best match automatically.

codex search <query>

Search by name (substring, case-insensitive). -t <table> to filter, -l <n> for limit.

codex filter [options]

Structured filter: --tier, --type, --class, --damage, --bucket, --stat.

codex rolls <name>

Show all possible perk rolls for a weapon (barrel, mag, traits, mods, catalyst). Answers "what can this weapon roll?"

codex perksearch <perk>

Reverse perk search: find all weapons that can roll a given perk. Alias: perks.

codex get <table> <hash>

Full readable definition by table + hash (all refs resolved inline).

codex resolve <hash>

Bare hash → short summary (auto-detects table).

codex raw <table> <hash>

Raw JSON of a definition.

Relationships & Graph

Command

Description

codex relationships <table> <hash>

Show outgoing + incoming references. Alias: codex rels.

codex graph <table> <hash>

Traverse the reference graph as a tree. Alias: codex tree.

codex compare <name1> <name2> [name3...]

Compare 2+ items side-by-side (stats, perks, properties).

Management

Command

Description

codex sync

Download/refresh the manifest. --force to re-download.

codex index

Build search indexes (speeds up everything ~10x). --rebuild to force.

codex info

Show manifest version + table list.

codex tables

List all definition tables.

codex mcp

Start the MCP server (for AI tool integration).

codex config set-key <key>

Save your Bungie API key.

codex config set-language <lang>

Save preferred manifest language (de, fr, es, ja, ...). Run sync after.

codex config get-language

Show currently saved language.

Examples

Look up an item

codex item Gjallarhorn
codex item "Last Wish" --table DestinyActivityDefinition
codex search Gjallarhorn
codex search "Wolfpack Rounds" -t DestinySandboxPerkDefinition
codex find "Last Wish" -l 5

Filter

# All Exotic Rocket Launchers
codex filter --tier Exotic --type "Rocket Launcher"

# All Legendary Titan helmets
codex filter --tier Legendary --class Titan --bucket Helmet

# Rocket Launchers with Blast Radius >= 90
codex filter --type "Rocket Launcher" --stat "Blast Radius:90"

# Solar Sidearms, max 10 results
codex filter --damage Solar --type "Sidearm" --limit 10

Relationships (how things connect)

# What does Gjallarhorn reference? (outgoing)
codex rels DestinyInventoryItemDefinition 1363886209 -d outgoing

# Who uses the "Wolfpack Rounds" perk? (incoming)
codex rels DestinySandboxPerkDefinition 2447763556 -d incoming

# Both directions
codex rels DestinyInventoryItemDefinition 1363886209

Graph traversal

codex graph DestinyInventoryItemDefinition 1363886209 --depth 3
codex tree DestinyInventoryItemDefinition 1363886209 --depth 2 --branch 10

Compare items

codex compare Gjallarhorn "Hezen Vengeance"
codex compare "Deathbringer" "Two-Tailed Fox" "Eyes of Tomorrow"

Weapon perk rolls

# What can Code Duello roll?
codex rolls "Code Duello"

# Exotic perks + catalyst
codex rolls Gjallarhorn

# Raid weapon rolls
codex rolls "Hezen Vengeance"
# Which weapons can roll Incandescent?
codex perksearch Incandescent

# Which weapons can roll Bait and Switch?
codex perks "Bait and Switch"

# Which weapons can roll Vorpal Weapon?
codex perksearch "Vorpal Weapon"

Multi-language support

# Switch to German
codex config set-language de
codex sync
codex index --rebuild

# Now everything is in German
codex item Gjallarhorn          # "Raketenwerfer (Exotisch)"
codex filter --tier Exotisch --type "Raketenwerfer"
codex rolls "Code Duello"       # "INTRINSISCHE EIGENSCHAFTEN", "WAFFEN-PERKS"

# One-off language for sync (without saving)
codex sync --language fr
codex sync -l ja

# Supported languages
en, de, es, es-mx, fr, fr-ca, it, ja, ko, pl, pt-br, ru, zh-chs, zh-cht

MCP Server (for AI tools)

Destiny Codex runs as an MCP server over stdio. AI assistants like Devin, Claude, and others can call it directly.

Start the server

codex mcp

Configure in Devin CLI

Add to .devin/config.json:

{
  "mcpServers": {
    "destiny-codex": {
      "command": "node",
      "args": ["/path/to/destiny-codex/dist/index.js", "mcp"],
      "cwd": "/path/to/destiny-codex"
    }
  }
}

MCP Tools

Tool

Description

manifest_info

Manifest version, language, table list with row counts. Auto-syncs.

list_tables

All definition tables.

search

Name search with optional table filter.

filter

Structured query: itemType, tierType, classType, damageType, bucket, stat ranges.

rolls

All possible perk rolls for a weapon (barrel, mag, traits, mods, catalyst).

perk_search

Reverse perk search: which weapons can roll a given perk?

get

Readable text rendering of a definition (all hash refs resolved inline).

resolve

Bare hash → short summary.

relationships

Outgoing + incoming references (how things connect).

graph

Traverse the reference graph N hops deep as a tree.

raw

Raw JSON of a definition.

How It Works

The Destiny 2 Manifest is a SQLite database with ~83 tables of JSON definitions. Every definition is full of hash references — itemHash: 1363886209, statHash: 155624089, etc. — that are meaningless without looking up the target.

Destiny Codex:

  1. Downloads the manifest from Bungie's API and caches it locally as SQLite.

  2. Builds indexes (forward hash→table, name index, reverse reference index) stored as a versioned SQLite DB.

  3. Resolves hash references two ways:

    • Field-name heuristic: itemHashDestinyInventoryItemDefinition (fast, no lookup needed)

    • Reverse index fallback: any hash → its table (handles unknown field names)

  4. Formats definitions as clean, indented text with hash refs replaced by "Gjallarhorn" (hash 1363886209, DestinyInventoryItemDefinition) inline.

  5. Traverses the reference graph in both directions: outgoing (what does X reference?) and incoming (who references X?).

Performance

Operation

Time

Manifest download

~10s (37 MB compressed)

Index build

~15s (one-time per manifest version)

codex search (with index)

~1.3s

codex rels (with index)

~1.2s

codex graph (with index)

~1.2s

codex filter

~0.3s

Requirements

Project Structure

src/
├── index.ts          # Entry point (loads dotenv, dispatches to CLI)
├── cli.ts            # Commander-based CLI
├── mcp-server.ts     # MCP server registering all tools
├── manifest.ts       # Bungie API client, SQLite cache, version tracking
├── resolver.ts       # Hash-reference detection + resolution
├── formatter.ts      # Definition → AI-readable text
├── relationships.ts  # Reverse index, outgoing-refs, graph traversal
├── filter.ts         # Structured filter queries
├── rolls.ts          # Weapon perk-roll extraction (plug sets, random rolls)
├── perksearch.ts     # Reverse perk search (which weapons can roll perk X?)
├── compare.ts        # Side-by-side item comparison
├── search.ts         # Name index for fast substring search
└── index-sqlite.ts   # SQLite-backed versioned indexes

License

PolyForm Noncommercial 1.0.0 — see LICENSE.

This software may never be used for commercial purposes. Personal use, research, education, charitable organizations, and government institutions are permitted. See the full license text for details.

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