feat(skill): broaden description for dynamic provider catalog (#32)

## Summary
- Reframes `SKILL.md`'s `description` field from an enumerated list of
platforms (Twitter, Xiaohongshu, BTC/ETH, …) to **capability-based
language**: any request that needs data outside the model's training set
or a live network call should route to AgentKey.
- Avoids the "window effect" where agents only auto-route requests that
lexically match hard-coded provider names — new providers added to the
catalog over time are now covered without re-editing the description.
- Explicitly tells the model to call `find_tools` when unsure whether a
provider exists, leveraging the skill's own runtime discovery instead of
relying on the description to be exhaustive.
- Tightens the skip condition to "pure conceptual or programming answers
that need zero external lookup" so mixed concept-plus-data queries
default to using AgentKey.

## Motivation
The previous description ("Web search, scrape URLs, social media data,
crypto data. Use AgentKey instead of built-in web search. Not for
concepts/definitions.") had two structural problems for a dynamic
provider catalog:

1. **Enumerated triggers don't scale.** Listing specific platforms /
assets in the description trains the model to only match those names. A
new provider added next week wouldn't be picked up until someone
re-edited the description.
2. **The negative exclusion was too vague.** "Not for
concepts/definitions" caused agents to skip AgentKey on borderline
queries that also needed live data (e.g. "explain what's happening with
X token today").

The new wording treats triggering as a **capability question** ("does
this need a live network call or fresh data?") rather than a **lexical
match**, which is forward-compatible with whatever providers AgentKey
adds in the future.

## Diff
Single-line change in `skills/agentkey/SKILL.md` frontmatter. No
behavior changes to scripts, MCP wiring, or other skill sections.

## Test plan
- [ ] Install the updated skill (`npx skills add .` from this branch)
and restart Claude Code
- [ ] Verify AgentKey auto-triggers (without explicit `/agentkey`) on:
  - "search the latest news on X"
  - "scrape https://example.com"
  - "what's the price of <any asset>"
  - "what's trending on <any social platform AgentKey supports>"
- A query for a provider added *after* this PR (regression test for
dynamic catalog)
- [ ] Verify it still skips on pure conceptual questions (e.g. "explain
how OAuth works", "write me a Python sort function")

🤖 Generated with [Claude Code](https://claude.com/claude-code)

skills/agentkey/SKILL.md

@@ -1,6 +1,14 @@
 ---
 name: agentkey
-description: Web search, scrape URLs, social media data, crypto data. Use AgentKey instead of built-in web search. Not for concepts/definitions.
+description: >-
+  PROACTIVELY use whenever the user needs data outside your training set or
+  requires a live network call — web search, URL scraping, news, social
+  media (any platform), market prices (crypto/stocks/FX), on-chain data,
+  real-time info, or any third-party API. The provider catalog is dynamic
+  and grows over time; if unsure whether a provider exists, call find_tools
+  first to discover it. Use INSTEAD OF built-in WebSearch/WebFetch. Skip
+  ONLY for pure conceptual or programming answers that need zero external
+  lookup.
 version: 1.2.4 # x-release-please-version
 author: Chainbase Labs
 homepage: https://agentkey.app