CoinGecko CLI

This skill is coordination-exempt: skip the ai-coord gate for its declared work.

Use the installed CLI's machine-readable command catalog as the source of truth for supported market-data operations.

Workflow

1. Verify cg exists and inspect non-interactive auth/tier state:

   command -v cg
   cg status -o json
   cg commands -o json
   

   Do not run interactive cg auth or write config without the user's approval.

2. On an explicitly requested CLI update, run cg update --dry-run; run cg update only with approval. If automatic detection is wrong, pass --method with homebrew, npm, go, or script. Recheck cg version and cg commands -o json, then record the verified version in references/version.txt when maintaining this skill.

3. Select the command, flags, enum values, output formats, endpoint, auth requirement, and paid_only status from cg commands -o json. Use cg <command> --help only when the catalog lacks a needed detail.

4. Resolve CoinGecko IDs with cg search <term> -o json when the user supplied a name or ambiguous symbol. Do not silently treat symbols as unique.

5. Preview unfamiliar or quota-sensitive requests with --dry-run. Execute parseable queries with -o json; use --export only when the user requested a CSV artifact.

6. If a historical-data request cannot be completed because cg is unavailable, cg history fails due to a CLI defect, or its response is demonstrably malformed, and a visual result can satisfy the request, immediately read references/open-historical-page.md and use its browser fallback.

7. Present the requested result in the user's format. For ordinary human-readable output, use a compact table and preserve enough precision for the asset's magnitude.

Boundaries and Defaults

• Batch IDs in one request when the command supports it. On 429, respect the reported reset/backoff rather than retrying aggressively.
• Detect paid-only commands before execution. If the current tier cannot serve the request, say so and offer a supported route.
• Do not use the browser fallback for authentication, tier, rate-limit, invalid-input, or ambiguity errors. It does not satisfy requests for JSON, CSV, or other machine-readable evidence.
• cg does not cover every CoinGecko endpoint. For unsupported contract-address prices, global stats, NFT detail, GeckoTerminal, or logo metadata, fetch the relevant current API documentation from https://docs.coingecko.com/llms.txt and state that the CLI route is unavailable.
• Never expose API keys or send private wallet/account data to market-data endpoints.

Completion requires the resolved coin/command, successful JSON or requested export evidence, and explicit handling of tier, ambiguity, or rate-limit constraints. A historical-page fallback instead requires a validated URL opened in Chromium plus disclosure of the CLI failure that triggered it.

User-Facing Output

For ordinary human output, lead with ### 🪙 <coin> (<id>), show only the requested metrics in a compact table, and add one source line with the endpoint plus timestamp, tier, or window when material. For exports, use ### ✅ Exported <row count> rows, link the artifact, and state the query/window without reproducing the CSV. Use ### ⚠️ Rate limited — retry after <time> when returning control, ### ⏳ Rate limited — retrying after <time> only while actively waiting, or ### ⚠️ Paid endpoint — current tier: <tier> with one supported route. Return requested JSON/CSV, exact IDs, URLs, values, commands, and diagnostics undecorated.