io.github.OSSNokalva/asn1-mcp
REMOTE · ASN1.IO
Compiles ASN.1 schema definitions into executable source code like Python and Rust.
Available components
Last scanned (9 hours ago)
Scores higher than 53% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Developer Tools
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. How we score → Why this is hard to score →
Endpoint Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability69
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 322 tokens (~322/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management33
- Stability observed for 10 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 1 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 5 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.
- 3 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.
- 31 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 29 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 27 Oct 26 +1
- Stability: unverified → 0.03 ▲ functional
- 26 Oct 26 63
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://asn1.io/mcp
TLS valid
Negotiated TLS 1.2 with TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=asn1.io,O=OSS Nokalva\, Inc.,ST=New Jersey,C=US | CN=Sectigo Public Server Authentication CA OV R36,O=Sectigo Limited,C=GB | 16 Oct 2026 | 2 May 2027 | RSA 2048 | SHA256-RSA | 3266c75935bcd2f9efbe85a5075e9065 |
| SANs: asn1.io | ||||||
| CN=Sectigo Public Server Authentication CA OV R36,O=Sectigo Limited,C=GB (CA) | CN=Sectigo Public Server Authentication Root R46,O=Sectigo Limited,C=GB | 22 Mar 2021 | 21 Mar 2036 | RSA 3072 | SHA384-RSA | 2c1a3c76e943ddddff191b31890aed71 |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of asn1.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 38690 | 8 | Verified |
| asn1.io. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://asn1.io/mcp | Verified | 200 | |
| http (plaintext) | http://asn1.io/mcp | HTTPS enforced | 301 | https://asn1.io/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
compile_asn1_schema ~322
Compiles ASN.1 schema definitions into executable source code. Use this tool whenever a user asks to generate code, compile an ASN.1 schema, or create a codec (e.g., DER, PER, UPER, BER) for a specific programming language. The tool returns the compilation status, error messages, and files containing the generated source code.
| Name | Type | Req | Description |
|---|---|---|---|
| codec | string | – | The ASN.1 encoding rules to support in the generated code. Valid options include 'uper', 'per', 'der', 'ber', or 'oer'. If the user does not specify a codec, default to 'der'. |
| fileName | string | – | The name of the schema file being compiled. This should end in '.asn' (e.g., 'Rocket.asn'). If the user does not provide a filename, invent a logical one based on the schema's main module name. It is… |
| schemaContent | string | – | Plain-text ASN.1 schema definition. This must be valid ASN.1 syntax, typically starting with the 'DEFINITIONS' keyword and concluding with 'END'. |
| targetLanguage | string | – | The target programming language for the generated code. Allowed values include 'python' and ‘rust’. Infer this from the user's prompt. If not specified, ask the user before calling the tool. |
| userId | string | – | The user's email address to look up the asn1.io user account. If the user's identity is unknown, pass an empty string. |
No output schema declared.
No examples provided.
How do I install the io.github.OSSNokalva/asn1-mcp server?
io.github.OSSNokalva/asn1-mcp is a hosted endpoint at https://asn1.io/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.
remote · asn1.io
claude mcp add --transport http ossnokalva-asn1-mcp 'https://asn1.io/mcp'
What is the io.github.OSSNokalva/asn1-mcp server?
io.github.OSSNokalva/asn1-mcp is listed in the public MCP registry as io.github.OSSNokalva/asn1-mcp. Compiles ASN.1 schema definitions into executable source code like Python and Rust. This page covers its hosted endpoint (https://asn1.io/mcp).
Is the io.github.OSSNokalva/asn1-mcp server safe to use?
io.github.OSSNokalva/asn1-mcp scores 68 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 io.github.OSSNokalva/asn1-mcp server expose?
io.github.OSSNokalva/asn1-mcp exposes 1 tool: compile_asn1_schema. Their descriptions and schemas cost roughly 322 tokens of context every time the server is loaded.
Does the io.github.OSSNokalva/asn1-mcp server require authentication?
No. We connected to io.github.OSSNokalva/asn1-mcp without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the io.github.OSSNokalva/asn1-mcp server still maintained?
io.github.OSSNokalva/asn1-mcp is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.