# A2A Peptides (remote · mcp.a2a-peptides.ai)

Agent-to-Agent (A2A) + Model Context Protocol (MCP) hub for peptides.

- Trust score: 70/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `mcp.a2a-peptides.ai`: 70/100 (this document), [markdown](https://verifymcp.io/servers/a2a-peptides-a2a-peptides/mcp.md), [page](https://verifymcp.io/servers/a2a-peptides-a2a-peptides/mcp)

## Channel facts

- Endpoint: `https://mcp.a2a-peptides.ai/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.6.7`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-20.

- **Endpoint Security**: 77/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 67/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1755 tokens (~87/item across 20 items; 20 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 71/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 20 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 21 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the A2A Peptides MCP server?

A2A Peptides is a hosted endpoint at https://mcp.a2a-peptides.ai/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http a2a-peptides-a2a-peptides 'https://mcp.a2a-peptides.ai/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "a2a-peptides-a2a-peptides": {
      "url": "https://mcp.a2a-peptides.ai/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "a2a-peptides-a2a-peptides": {
      "type": "http",
      "url": "https://mcp.a2a-peptides.ai/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.a2a-peptides-a2a-peptides]
url = "https://mcp.a2a-peptides.ai/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "a2a-peptides-a2a-peptides": {
      "type": "remote",
      "url": "https://mcp.a2a-peptides.ai/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add a2a-peptides-a2a-peptides --url 'https://mcp.a2a-peptides.ai/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  a2a-peptides-a2a-peptides:
    url: "https://mcp.a2a-peptides.ai/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "a2a-peptides-a2a-peptides": {
      "Transport": "http",
      "Url": "https://mcp.a2a-peptides.ai/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add a2a-peptides-a2a-peptides -t streamable-http -u 'https://mcp.a2a-peptides.ai/mcp'
```

### Other

```json
{
  "mcpServers": {
    "a2a-peptides-a2a-peptides": {
      "type": "http",
      "url": "https://mcp.a2a-peptides.ai/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-20 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-19 (score 69, +2)

- [security improvement] DNSSEC: fail → pass
- [functional improvement] Stability: unverified → 0.03
- [functional] Server version: 1.6.5 → 1.6.7
- [functional] Server version: 1.6.3 → 1.6.5

### 2026-09-18 (score 67)

First indexed and scored.

## MCP tools (20)

### `resolve_jurisdiction` (~126 tokens)

Resolve Jurisdiction

Resolve a ship-to (e.g. 'US-CA', 'CA-ON', 'MX', 'EU-DE', 'UK', 'KR', 'JP', 'SG', 'CH') to the gate's jurisdiction (US · CA · MX · EU · UK · KR · JP · SG · CH; UK is the jurisdiction name; the ISO 3166-1 code is accepted as input, machine fields carry the ISO code and jurisdiction_label carries UK), the EU member and any state, provincial or cantonal overlay.

Input parameters:

- `ship_to` (string, required)

### `resolve_actor` (~115 tokens)

Resolve Actor

Resolve the actor class and channel. Classes: authorized_trading_partner and its members (manufacturer · repackager · wholesale_distributor · dispenser · third_party_logistics_provider; cosmetic_responsible_person · nhp_licence_holder on the non-drug pathways), prescriber, the referral classes patient and public, and agent (inherits the class of the credential it presents; none returns DENY_UNLICENSED_AGENT). Returns communication_class: trade_information or public.

Input parameters:

- `actor_class` (string, required)
- `credential`

### `gate_transaction` (~129 tokens)

Gate Transaction

The gate: allow, deny or require_rx for a substance (name, INN or unii:), a pathway (licensed_medicine · lawful_compounding · cosmetic · food_or_supplement · ruo_not_cleared), an actor class, a channel and a ship-to. Returns a frozen reason code, the rule-set version, the source page and a decision_id for the downstream tools.

Input parameters:

- `actor_class` (string, required)
- `channel`
- `credential`
- `pathway` (string, required)
- `ship_to` (string, required)
- `substance` (string, required)

### `get_substance_record` (~59 tokens)

Get Substance Record

One molecule: identifiers (INN, UNII, CAS, sequence hash), sourced aliases, class, one pathway row per jurisdiction × pathway, enforcement events, safety references. Every field carries its source page.

Input parameters:

- `substance` (string, required)

### `get_pathway_status` (~58 tokens)

Get Pathway Status

The status of a substance on one pathway in one jurisdiction (frozen vocabulary), with effective date, rule-set version and source page.

Input parameters:

- `jurisdiction` (string, required)
- `pathway` (string, required)
- `substance` (string, required)

### `get_compounding_eligibility` (~61 tokens)

Get Compounding Eligibility

Whether a substance may be lawfully compounded in a jurisdiction and under which list or standard (503A/503B, provincial, magistral, Specials), from the register.

Input parameters:

- `jurisdiction` (string, required)
- `substance` (string, required)

### `get_label_and_indication` (~41 tokens)

Get Label And Indication

Label and indication pointers for a licensed presentation only (US package NDC, CA DIN, EU EMA number).

Input parameters:

- `presentation_id` (string, required)

### `get_enforcement_watch` (~61 tokens)

Get Enforcement Watch

Dated, URL'd enforcement events for a substance or jurisdiction: warning letters, import alerts, shortage-list changes, committee votes, proposed and final rules, seizures, state notices.

Input parameters:

- `jurisdiction`
- `since`
- `substance`

### `search_cleared_items` (~113 tokens)

Search Cleared Items

Presentations that passed the gate for a jurisdiction, pathway and actor class (a query by substance, brand or holder; optional banner filter on the shelf of record). Only cleared statuses are returned; every item carries its availability block (banners, pos_count, product_urls).

Input parameters:

- `actor_class` (string)
- `banner`
- `decision_id`
- `jurisdiction` (string, required)
- `limit` (integer)
- `pathway` (string)
- `query` (string, required)

### `get_item` (~94 tokens)

Get Item

One authorised presentation by id (US package NDC, CA DIN, EU EMA number, KR MFDS item seq, CH Swissmedic authorisation/pack code, JP approved-list entry, or the catalogue id): brand, strength, form, route, device, pack, holder, status, offers (tenant is a parameter).

Input parameters:

- `decision_id`
- `presentation_id` (string, required)
- `tenant`

### `compare_presentations` (~39 tokens)

Compare Presentations

Compare two or more authorised presentations side by side (ids as for get_item).

Input parameters:

- `decision_id`
- `presentation_ids` (array, required)

### `find_licensed_supplier` (~67 tokens)

Find Licensed Supplier

Licensed parties for a presentation in a jurisdiction (tenant as a parameter). Takes the decision_id of an allow or require_rx decision from gate_transaction.

Input parameters:

- `decision_id` (string, required)
- `jurisdiction` (string, required)
- `presentation_id` (string, required)
- `tenant`

### `get_availability` (~110 tokens)

Get Availability

Availability of a presentation once gate_transaction has answered allow or require_rx (decision_id): the availability block — banners[] on the shelf of record with licence footnote, pos_count (chain points of sale from the CPG Knowledge Graph retailer registry, or licensed dispensers on the provider directory for medicines), product_urls[] (retailer product page, register page, holder page) — plus tenant offers.

Input parameters:

- `decision_id` (string, required)
- `presentation_id` (string, required)
- `tenant`

### `get_price` (~56 tokens)

Get Price

Price basis (list · contract · reimbursement) from a licensed party, once gate_transaction has answered allow or require_rx (decision_id).

Input parameters:

- `decision_id` (string, required)
- `presentation_id` (string, required)
- `tenant`

### `get_lot_coa` (~54 tokens)

Get Lot Coa

Certificate of analysis for a lawful lot of a presentation, where the pathway permits (decision_id required).

Input parameters:

- `decision_id` (string, required)
- `lot` (string, required)
- `presentation_id` (string, required)

### `verify_serialization` (~79 tokens)

Verify Serialization

Verify a serialised pack (GTIN + serial + lot + expiry) against the serialisation regime of the jurisdiction (DSCSA · FMD · UK · KR; none-national elsewhere).

Input parameters:

- `expiry`
- `gtin` (string, required)
- `jurisdiction` (string, required)
- `lot`
- `serial` (string, required)

### `create_order_intent` (~76 tokens)

Create Order Intent

Create an order intent for a cleared item after the gate; the intent carries reason_code + rule_set_version and settles by x402 on peptides-x402.ai.

Input parameters:

- `decision_id` (string, required)
- `presentation_id` (string, required)
- `quantity` (integer, required)
- `ship_to`
- `tenant`

### `a2a_handoff` (~133 tokens)

A2A Handoff

Hand off over Agent-to-Agent (A2A). With an allow/require_rx decision: the order intent goes to the licensed counterparty's agent (envelope + card URL). With a deny for a patient, the public or an unauthorized actor: returns real licensed destinations from the provider directory (dispensers, prescribers) filtered by the decision's jurisdiction, state/province and practice scope — a referral, never a vial.

Input parameters:

- `counterparty_card_url`
- `decision_id`
- `intent_id`
- `limit` (integer)
- `practice_scope`

### `get_safety_label` (~44 tokens)

Get Safety Label

Safety label pointers for licensed products (label page and the pharmacovigilance scheme of the jurisdiction).

Input parameters:

- `jurisdiction` (string, required)
- `substance` (string, required)

### `log_audit` (~47 tokens)

Log Audit

Write the audit line for a gate decision or an order intent (returns the line id).

Input parameters:

- `kind` (string, required)
- `note`
- `reference_id` (string, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/a2a-peptides-a2a-peptides/mcp#diagnostics

## Score history

- 2026-09-20: 70
- 2026-09-19: 69
- 2026-09-18: 67

## Common questions

### What is the A2A Peptides MCP server?

A2A Peptides is an MCP server listed in the public MCP registry as io.github.A2A-Peptides/a2a-peptides. Agent-to-Agent (A2A) + Model Context Protocol (MCP) hub for peptides. This page covers its hosted endpoint (https://mcp.a2a-peptides.ai/mcp).

### Is the A2A Peptides MCP server safe to use?

A2A Peptides scores 70 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the A2A Peptides MCP server expose?

A2A Peptides exposes 20 tools: resolve_jurisdiction, resolve_actor, gate_transaction, get_substance_record, get_pathway_status, and 15 more. Their descriptions and schemas cost roughly 1,562 tokens of context every time the server is loaded.

### Does the A2A Peptides MCP server require authentication?

No. We connected to A2A Peptides without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the A2A Peptides MCP server still maintained?

A2A Peptides is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://mcp.a2a-peptides.ai/mcp
- Repository: https://github.com/A2A-Peptides/A2A-Peptides
- Website: https://a2a-peptides.ai/
- Changelog RSS feed: https://verifymcp.io/servers/a2a-peptides-a2a-peptides/mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/a2a-peptides-a2a-peptides/mcp.json
- HTML version of this page: https://verifymcp.io/servers/a2a-peptides-a2a-peptides/mcp