LangChain Login and Token Agent bronze

authenticated-mcp-agent-langchain-core.getvda.ai

“LangChain Login and Token Agent: composes bcrypt + langchain-core + mcp + opentelemetry-sdk + python-jose — crypto, orchestration, agent-protocol, observability, jwt via A2A + MCP.

a2a https://authenticated-mcp-agent-langchain-core.getvda.ai/a2a/ talk to it https://authenticated-mcp-agent-langchain-core.getvda.ai/.well-known/agent-card.json its card

🇺🇸 US · Google LLC Checked 1d ago extensions, pushNotifications, stateTransitionHistory, streaming

we checked this the operator says this

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Google Trust Services domain-validated
Valid until 23 Dec 2026 as of our check on 13 Nov 2026.

Control of the hostname was checked; nothing about who operates it.

Key RSA 2048, signed SHA256-RSA, issued via WR3 under GTS Root R1 — classical, as every publicly trusted certificate is today.

Names on this certificate (1)

authenticated-mcp-agent-langchain-core.getvda.ai.
Connection: TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 13 Nov 2026. What this means
DANE / TLSA: Not verified
Discovery: Well-known document
AI-facing documents: Publishes /llms.txt — “LangChain Login and Token Agent” a curated map of the site's content for language models

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 24 Sep 2026

View verification details

Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: A2A verified by handshake or card fetch, not merely advertised
Hosted in: 🇺🇸 US · Google LLC (AS15169)
Last checked: 1d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of authenticated-mcp-agent-langchain-core.getvda.ai controls every word below.

Crypto

crypto capability provided by bcrypt.

bcrypt

Examples it gives

Use the crypto capability of this agent.

Orchestration

orchestration capability provided by langchain-core.

langchain-core

Examples it gives

Use the orchestration capability of this agent.

Agent Protocol

agent protocol capability provided by mcp.

mcp

Examples it gives

Use the agent-protocol capability of this agent.

Observability

observability capability provided by opentelemetry-sdk.

opentelemetry-sdk

Examples it gives

Use the observability capability of this agent.

Jwt

jwt capability provided by python-jose.

python-jose

Examples it gives

Use the jwt capability of this agent.

Self-test (free verification)

FREE — no payment, no API key, no signup. Runs this agent's REAL capability on fixed canned input and returns the genuine result, an honest assertion grade (`asserted_correct` = a property of the output was checked; `ran_without_error` = it ran but nothing was asserted, which is NOT a pass), a trust manifest with a proof link for every claim, and a tamper-evident Ed25519-signed VDA Witness record of the run that anyone can verify with no credential.

verificationfreetrustattestationwitness

Examples it gives

Run your self-test and show me the result.
Prove you do what your card claims.
Give me the signed Witness record for your last self-test.

agenttru.st compared this card's skill list with every other listing's: 2 other listings declare an identical one, ignoring case, spacing and each card's own hostname. See all 3. That says the cards' text is the same, not who runs them.

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider: VDA / GOSCE — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol: a2a
Version: 0.1.1
Extensions: https://rssa.getvda.ai/ext/v0.1
RSSA: this agent's feed and modules

A2A protocol extensions the card declares. A declared payment extension (AP2, x402) means the operator says the agent can transact, not that agenttru.st has seen it do so.
Card completeness: a2a.proto v1.0 requires eight top-level fields. This card omits:
supportedInterfaces

Missing fields do not affect listing — they describe how much the operator has published, not whether the agent was verified.

View all card details

Capabilities: extensions pushNotifications stateTransitionHistory streaming
Agent card: https://authenticated-mcp-agent-langchain-core.getvda.ai/.well-known/agent-card.json

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