def

A project command that finds where a function, class, or other named code symbol is defined in an indexed codebase.

In plain words
What is it for?
Use it to find definitions by name, optionally narrowed to a kind such as class or function, and then inspect related code or callers.
Why use it?
It saves time searching through files when you need to locate the source of a piece of code.

Command

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/s1lv4/th0th/def
Clone the repo
git clone --depth 1 https://github.com/S1LV4/th0th
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 268 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00014 $0.00268
Opus 5 $0.00007 $0.00134
Sonnet 5 $0.00003 $0.00054
Haiku 4.5 $0.00001 $0.00027

Measured 2d ago against content hash 971bc6e91970, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

def scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

apps/claude-plugin/commands/def.md · 18 lines

What it actually says

Find symbol definitions via th0th.

Arguments: $ARGUMENTS (first token is symbolName, optional second is a kind filter like class or function).

Strategy:

  1. If the user gave only a name, call mcp__th0th__th0th_go_to_definition first — it's cheaper and usually exact.
  2. If 0 results, fall back to mcp__th0th__th0th_search_definitions with search=<name> and optional kind=<kind>.
  3. Render a table: name | kind | file:lineStart-lineEnd | exported | centralityScore.
  4. If the user asked a follow-up like "show me", offer to run mcp__th0th__th0th_search for code snippets or th0th_get_references for callers.

Resolve projectId from the cwd unless user specifies.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 18 lines · 14 tokens per session scan A 971bc6e91970

Subscribe to this mod's changes

def is a command published in the GitHub repository S1LV4/th0th (135 stars, last pushed 2mo ago), licensed MIT. It adds 14 tokens to every session and 268 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.