feat: add Exa AI-powered search tool

[tgonzalezc5]

Summary

• New exa_search tool that provides web search via the Exa search API, complementing the existing Tavily and Serper integrations
• Supports neural/semantic search, category filtering (company, news, research paper, etc.), domain filtering, text filtering, date ranges, and batch queries via |||
• Returns results in the same structured JSON format as the existing web_search tool (title, URL, snippet, published date, author)
• Follows the Kortix proxy pattern: uses EXA_API_URL + KORTIX_TOKEN when routed through the proxy, or EXA_API_KEY for direct API access

Usage example

query: "latest advances in neural search ||| transformer architectures 2024"
num_results: 5
search_type: "auto"
content_mode: "highlights"
category: "research paper"
include_domains: "arxiv.org,nature.com"

Files changed

File	Change
core/kortix-master/opencode/tools/exa_search.ts	New Exa search tool
core/kortix-master/tests/unit/exa-search.test.ts	Unit tests (19 tests)
packages/shared/src/tools/display-names.ts	Display names for exa_search
packages/shared/src/tools/icon-keys.ts	Icon key mapping for exa_search
core/docker/.env.example	EXA_API_KEY and EXA_API_URL entries
core/kortix-master/seed-env.json	EXA_API_KEY placeholder

Test plan

• Unit tests pass (bun test tests/unit/exa-search.test.ts - 19/19 pass)
• Snippet fallback logic: highlights > summary > text > empty string
• Batch query parsing and formatting
• API error and network error handling
• Domain parsing (comma-separated, whitespace trimming, empty filtering)
• Response formatting matches existing web_search output structure
• Manual test with live EXA_API_KEY in sandbox environment

---

Note

Medium Risk
Adds a new external-API tool path with env-driven auth/proxy behavior; issues would primarily affect web-search functionality and runtime configuration rather than core platform security.

Overview
Introduces a new exa_search OpenCode tool that queries the Exa Search API (with optional EXA_API_URL proxy routing) and returns structured JSON results, including support for batch queries, search/content modes, and domain/text/date/category filters.

Wires the integration into configuration and UX by adding EXA_API_KEY/EXA_API_URL placeholders to .env.example and seed-env.json, adding display names and icon mappings for exa_search, and adding unit tests that cover snippet/formatting helpers and basic fetch error handling.

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