# `app.peptidelibrary/peptide-library` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/app.peptidelibrary/peptide-library
- JSON: https://anlyon.dev/api/v1/servers/app.peptidelibrary/peptide-library
- Version: 1.0.1 (active)
- Publisher: app.peptidelibrary (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Repository: https://github.com/ryandelauz/peptide-library-mcp
- Metadata from the official MCP Registry, synced 2026-10-21T17:44:55.017Z

Title and description, as the publisher wrote them:

```untrusted-server-text
Peptide Library
Peptide research profiles, evidence by tier, comparisons and educational content. No dosing.
```

Scanned 2026-10-21T18:31:47.131Z over streamable-http.

**10 tools: 1 do something that can't be undone, 3 change things and 6 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 1 | ask |
| Changes things | write | 3 | ask |
| Only reads | read | 6 | allow |

## Findings

- **warn** Annotations that disagree with the tool in `convert_units` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "convert_units" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "convert_units" says "convert": a word for a change.
```


## Can't be undone (1)

Sends, pays, publishes or merges: once done, it cannot be taken back. Claude Code: ask.

### `convert_units`

- The name "convert_units" says "convert": a word for a change.
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- Findings: warn annotation-conflict

Description, as the server wrote it:

```untrusted-server-text
Convert an amount between mg and mcg exactly. IU ↔ mass conversion only works with a peptide whose profile documents an IU-per-mg factor (pass `peptide`); otherwise the result is an iu_factor_missing issue, never an assumed factor. Pure arithmetic: not a dosing recommendation.
```

## Changes things (3)

Creates or changes something that can be changed back. Claude Code: ask.

### `blend_concentrations`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
For several components dissolved together in one volume: each component's concentration and its share of the blend by amount. Arithmetic only; it says nothing about whether components can or should be combined.
```

### `cost_per_amount`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Price arithmetic for a purchase: total cost (price plus optional shipping) and cost per mg, per mcg and (with a peptide's documented factor) per IU. Uses only the numbers given; it never estimates prices or shipping and converts no currencies.
```

### `solution_concentration`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Concentration of an amount dissolved in a volume of liquid (amount ÷ volume), as mg/mL, mcg/mL and, with a peptide's documented factor, IU/mL. Pure arithmetic on the given numbers: it does not suggest amounts, volumes or how to prepare anything.
```

## Only reads (6)

Looks things up and changes nothing. Claude Code: allow.

### `compare_peptides`

- The name "compare_peptides" says "compare": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Side-by-side research comparison of 2-3 peptides on structured profile fields: mechanism and targets, research areas, evidence level and human-trial availability, safety and side effects, FDA/WADA status, half-life and studied routes, with references. Each row says whether the values are the same, different, partial, not comparable or incomplete; missing data is never filled in and the comparison never ranks peptides. Suitable for tables. No dosing information.
```

### `get_peptide_categories`

- The name "get_peptide_categories" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
List the Peptide Library research categories (e.g. GLP-1/Metabolic, Cognitive, Longevity) with a description, the number of profiles and every profile in each, with links. Use a category id with search_peptides to filter.
```

### `get_peptide_details`

- The name "get_peptide_details" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Full educational research profile for one peptide: classification, mechanism and targets, research areas, evidence by tier (regulatory label, controlled human trials, other human studies, secondary reports, animal and in-vitro research) with cited sources, safety and side effects, regulatory status (FDA, WADA), review dates and the canonical Peptide Library URL. Fields the profile lacks are "not_documented". Dose figures and administration instructions are never included.
```

### `get_research_trends`

- The name "get_research_trends" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
This week's most-researched peptides in the Peptide Library community (Trending Now, last 7 days): rank, share of researchers and growth as percentages, with what moved. Aggregate and privacy-preserving: no head counts, no individual activity, small cohorts suppressed. Popularity is not evidence of safety or effectiveness.
```

### `search_peptides`

- The name "search_peptides" says "search": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Search the Peptide Library research database by name, synonym or alias (fuzzy), optionally filtered by research category or research area. Returns short educational profiles with evidence level and the canonical Peptide Library URL. Use get_peptide_details for the full profile. No dosing information.
```

### `search_research`

- The name "search_research" says "search": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Search Peptide Library's own educational content: the site FAQ, per-peptide FAQs, published articles and free courses. Returns titles, short snippets and links with source attribution (no full text, no third-party articles). Dosing, reconstitution and injection guides, and content about buying, vendors or prices, are excluded.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `peptide-library`:

```json
{
  "permissions": {
    "allow": [
      "mcp__peptide-library__search_peptides",
      "mcp__peptide-library__get_peptide_details",
      "mcp__peptide-library__compare_peptides",
      "mcp__peptide-library__search_research",
      "mcp__peptide-library__get_peptide_categories",
      "mcp__peptide-library__get_research_trends"
    ],
    "ask": [
      "mcp__peptide-library__convert_units",
      "mcp__peptide-library__solution_concentration",
      "mcp__peptide-library__blend_concentrations",
      "mcp__peptide-library__cost_per_amount"
    ],
    "deny": []
  }
}
```