Add anchor-idl-agent: meta-skill that turns any Anchor IDL into agent-callable tools

[Jay0xx]

Adds anchor-idl-agent, a meta-skill that turns any deployed Anchor program on Solana into an agent-callable tool surface. Registered as a submodule under .claude/skills/ext/anchor-idl-agent.

• Skill repo: https://github.com/Jay0xx/anchor-idl-agent-skill (MIT)
• Bounty submission: https://github.com/solanabr/skill-bounty/issues (filed alongside this PR)

Why this skill

Every other skill in the kit teaches an agent about one domain — payments, games, oracles, token extensions. This one is the meta layer: it lets an agent consume the long tail of thousands of deployed Anchor programs (or any new program shipped tomorrow) without per-program glue code. When the user names an arbitrary program ID — or a protocol the kit doesn't ship dedicated coverage for — this skill takes over.

What it does

• IDL ingestion (on-chain / GitHub / file / Anchor.toml) — handles both v0.29 legacy and v0.30+ specs, with on-chain discriminator verification
• Tool-schema generation — emits one JSON-schema tool per instruction, with accounts auto-bucketed into auto / resolved / user
• Automatic account resolution — PDA derivation from IDL seeds, ATA derivation (incl. Token-2022), sysvar substitution, signer detection
• Mandatory pre-flight simulation with CU surfacing, return-data decoding, account-diff, explicit confirmation
• Anchor error decoding — 0x1771 → enum name → source line, with constraint-violation parsing
• Safety rails — mainnet program allowlist, hard CU/fee caps, simulate-or-die, no auto-retry
• Worked adapters for Jupiter V6, Drift V2, Kamino Lend, MarginFi v2, Squads v4 — incl. "propose-via-Squads" mode
• Reference TypeScript impl at code/ — @solanabr/anchor-agent-toolkit — vitest + Surfpool harness

What this PR changes

• .gitmodules — registers Jay0xx/anchor-idl-agent-skill as a submodule
• .claude/skills/SKILL.md — new "Anchor IDL Runtime (meta)" section + Task Routing row
• .claude/skills/ext/anchor-idl-agent — submodule pointer

Subagents: idl-tool-architect (opus), idl-adapter-engineer (sonnet). Commands: /ingest-idl, /explain-ix, /simulate-ix, /decode-error.

License: MIT.

[vercel]

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