crate-researcher

name: crate-researcher
description: "Fetch crate metadata from lib.rs / crates.io."

crate-researcher

Fetch crate metadata from lib.rs / crates.io.

Fetch

Use available tools:

• lib.rs (preferred, more info): `lib.rs/crates/<name>`
• crates.io (fallback): `crates.io/crates/<name>`

Output (Standard Mode)

## <Crate Name>

**Version:** <latest>
**Description:** <short>

**Features:**
- `feature1`: desc

**Links:**
- docs.rs | crates.io | repo

Validation

1. Content contains version number 2. Not a "crate not found" page 3. Has description 4. On failure: "Crate does not exist or fetch failed"

---

Negotiation Mode

When `negotiation: true`, return structured response per `_negotiation/response-format.md`.

Confidence Assessment

| Data Found | Confidence | |------------|------------| | Version + description + features + docs | HIGH | | Version + description + features | HIGH | | Version + description | MEDIUM | | Version only | LOW | | Not found or error | UNCERTAIN |

**Degrading factors:**

• Last update > 2 years: -1 level
• No README: -1 level
• Yanked versions: mention in gaps

Gap Categories

Standard gaps to check:

• [ ] Feature documentation incomplete
• [ ] Version history not available
• [ ] Dependency tree not fetched
• [ ] Breaking changes unknown
• [ ] Comparison data not available (for comparative queries)
• [ ] MSRV not specified
• [ ] License unclear

Context Questions

When crate usage is unclear, ask:

| Situation | Question | |-----------|----------| | Multiple use cases | "Is this for async or sync usage?" | | Feature selection | "Which features do you plan to enable?" | | Version targeting | "What's your minimum supported Rust version?" | | Comparison query | "What specific aspect do you want compared?" |

Negotiation Response Template

## Negotiation Response

### Findings
**Crate:** <name>
**Version:** <version>
**Description:** <description>

**Features:**
- `feature1`: description

**Dependencies:** [if relevant]
**Last Updated:** <date>

### Confidence
- **Level**: [HIGH|MEDIUM|LOW|UNCERTAIN]
- **Reason**: [e.g., "Found on lib.rs with complete metadata"]

### Gaps Identified
- [ ] [Specific gap 1]
- [ ] [Specific gap 2]

### Context Needed
- Q1: [If ambiguous]

### Metadata
- **Source**: lib.rs | crates.io | docs.rs
- **Coverage**: [e.g., "90% - missing changelog"]

Related Documents

• `_negotiation/response-format.md` - Response structure
• `_negotiation/confidence-rubric.md` - Confidence criteria