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Browse the full Particle tool catalog. Your tools/list shows the default categories plus the always-on system category (which is why particle_catalog itself always appears), but every public Particle tool is callable by name regardless of what was advertised — call this tool to discover the rest. It’s always-on (the system category can never be excluded) and free (tier free, cost 0).
  • Without arguments: the categorical menu — every category with its tool names, tiers, and one-line summaries.
  • With category: the full input schema for each of that category’s tools, ready to call.
The typical discovery loop: call particle_catalog with no arguments to see what exists, then particle_catalog with a category to get the input schemas, then call the tool directly — or via particle_call if your harness blocks un-advertised tool names.

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Inputs

FieldTypeRequiredDefaultDescription
categorystringno—Exposure category name (e.g. "podcast_bias"). When set, the response includes the FULL input schema for every tool in that category — call this before invoking a tool you haven’t seen advertised. When omitted, returns the categorical menu: every category with its tools and one-line summaries.
An unknown category returns an actionable error suggesting a no-argument call to list every category.

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Output

A markdown document with ## Particle tool catalog and one ### <category> (default|opt-in|always-on) section per category. Each section carries the category summary and one bullet per tool, formatted **tool_name** (tier) — summary. In detail mode (a category was supplied), each tool bullet is followed by its input schema rendered as a fenced JSON block. Sample (no arguments, abridged): 
## Particle tool catalog

### system (always-on)

Discovery meta-tools: browse the full tool catalog and call any tool by name.

- **particle_call** (free) — Dispatch any public Particle tool by name
- **particle_catalog** (free) — Browse the full Particle tool catalog

### podcasts (default)

Resolve podcasts, list and fetch episodes, search transcripts, and find entity mentions.

- **particle_podcast_resolve** (standard) — Find a podcast by free-text title, exact slug, iTunes ID, or RSS feed URL
- **particle_podcast_search_transcripts** (premium) — Search the podcast catalog by what is said in episodes
- …

### podcast_bias (opt-in)

Corpus-wide political-bias views: publisher leaderboards and publishers by bias result.

- **particle_podcast_get_bias_leaderboard** (premium) — Rank podcast publishers by political-bias metrics across their analyzed catalogs
- **particle_podcast_list_bias_publishers** (premium) — Which publishers have the most podcasts in one political-bias bucket

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Example

# Discover what exists, then drill into a category for schemas.
Agent calls: particle_catalog {}
            → reads the category menu, spots "podcast_bias (opt-in)"

Agent calls: particle_catalog { "category": "podcast_bias" }
            → reads the full input schema for particle_podcast_get_bias_leaderboard

Agent calls: particle_podcast_get_bias_leaderboard { "metric": "most_right_leaning" }
            (directly — or via particle_call if the harness blocks it)