Add llm-perplexity-agent to the plugin directory

[zalez]

Adds one line to docs/plugins/directory.md for llm-perplexity-agent, which provides a perplexity-agent model.

llm install llm-perplexity-agent
llm -m perplexity-agent 'What changed in MCP 2026-07-28?'

Why a second Perplexity plugin

It is complementary to llm-perplexity, not a replacement, and I placed it directly after that entry so the distinction is visible from adjacency.

llm-perplexity wraps Perplexity's Sonar chat models — sonar, sonar-pro, sonar-deep-research, sonar-reasoning-pro. This wraps their Agent API (POST /v1/agent), a different endpoint: a multi-step agent that runs its own searches, fetches pages and synthesises one cited answer.

There is no model-name overlap, and both use the same perplexity key alias, so having both installed works with no extra configuration — which is how I run them.

Options

llm -m perplexity-agent -o preset xhigh -o recency week 'Latest on X'
llm -m perplexity-agent -o domains 'nasa.gov,-reddit.com' 'Artemis status'

preset selects research depth and is passed through unvalidated, since Perplexity's schema declares no enum for it. Poll progress goes to stderr so the answer still pipes cleanly.

Published on PyPI as llm-perplexity-agent. BSD-3-Clause. Tested against Python 3.10–3.14.