Reported issues for iana-registries-mcp-server

Pod holds 12 of 12 GitHub reports that passed its relevance review. This can include external user reports, maintainer-confirmed bugs, and concrete feature gaps. Treat them as evidence to inspect, not a count of distinct defects.

Back to iana-registries-mcp-server.

Most discussed

bug(upstream): plain-http redirect on iana.org followed, then failed as retryable

Server version

0.1.1

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

OS

macOS 27.0

Description

The protocols index links address-literal-tags, but its XML URL answers 301 to a plain-http URL on the same host (http://www.iana.org/assignments/smtp/smtp.xml, which serves the registry over http with 200). The upstream client follows redirects automatically, so it has already made the plain-http…

Read the thread · 2026-10-01 · closed · 2 comments

bug(format): fields after a quoted block render inside the blockquote

Server version

0.1.0

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

Description

format() puts server-authored lines directly after a quote() block with no blank line. Under CommonMark's laziness rule (spec §5.1), a paragraph line that follows a > line continues the blockquote, so those fields render inside the quoted third-party text, blurring the boundary the quoting exists to mark.

Steps to…

Read the thread · 2026-10-01 · closed · 2 comments

bug(iana_lookup_pen): organization search for "cisco" misses PEN 9 (ciscoSystems)

Server version

0.1.0

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

Description

iana_lookup_pen organization search does not find PEN 9, Cisco's enterprise number (the 1.3.6.1.4.1.9 arc), from "cisco" or "cisco systems". The registry writes the organization as the single camelCase token ciscoSystems, and the token normalizer does not split lower-to-upper case boundaries, so only the exact joined…

Read the thread · 2026-10-01 · closed · 2 comments

bug(search): matches past the max limit are unreachable, and the notice still says raise limit

Server version

0.1.0

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

Description

List modes have no offset or cursor, so matches past the maximum limit cannot be retrieved. At the maximum, the notice still tells the caller to raise limit. Affected: keyword/organization/description modes of iana_lookup_port, iana_lookup_media_type, iana_lookup_pen (confirmed past the cap), and…

Read the thread · 2026-10-01 · closed · 2 comments

bug(iana_get_registry_records): record-less YANG and MIB registries fail as retryable or answer empty

Server version

0.1.0

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

Description

Registries that iana_search_registries lists but that hold no <record> elements are mishandled. The 26 "YANG Modules" registries (iana-tls-cipher-suite-algs is the second hit for "tls cipher") publish XML with only metadata: title, description, xrefs, no <file> pointer. The read is treated as upstream_unreadable,…

Read the thread · 2026-10-01 · closed · 2 comments

bug(iana_lookup_media_type): "No registration template available." page reported as a template read

Server version

0.1.1

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

OS

macOS 27.0

Description

For some registered types, IANA's template URL answers HTTP 200 with the 35-byte placeholder No registration template available. instead of a template. iana_lookup_media_type reads that as a template with no statements and returns template: { fetched: true }, the same shape as a real template that…

Read the thread · 2026-10-01 · closed · 1 comment

feat(iana_lookup_media_type): say keyword search does not cover file extensions

Use case

"Which media type is a .jpg / .mp3 / .docx file?" is a common media type question, and iana_lookup_media_type keyword mode cannot answer it: keywords match registered type names, and the registry carries no file extensions. Of 61 common extensions whose type is registered (registry of 2026-09-24), 22 miss with "Try fewer words." though they are one word (mp3, docx, txt), and 8 return found: true without the type the extension usually denotes (jpg returns only…

Read the thread · 2026-10-01 · closed · 1 comment

feat(iana_get_rfc_status): accept tools.ietf.org, ietf.org/rfc, and draft archive URLs

Use case

URL and file-name forms common in documentation and source comments come back kind: "unsupported" from iana_get_rfc_status, though each names exactly one document, and the guidance ("neither an RFC number nor a draft name") does not say what the tool accepts:

Read the thread · 2026-10-01 · closed · 1 comment

Most recent

feat(iana_get_registry_records): exact match on any column, consistent key, hex code-point forms

Use case

People usually hold a registry entry's mnemonic or its wire form, not the key column. iana_get_registry_records value matches only the key, so common lookups miss, and a row without the value_field column is keyed by its first field instead, which returns partial answers. Measured 2026-10-01:

Read the thread · 2026-10-01 · closed · 1 comment

bug(iana_get_registry_records): root notes and nested tables dropped on sub-registry reads

Server version

0.1.1

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

OS

macOS 27.0

Description

iana_get_registry_records drops context held by the tables around the one it reads:

1. A sub-registry read never returns the root's notes. iana-ipv6-special-registry records cite root footnotes ("source": "False 1") that its default read, which picks the one sub-registry, never returns;…

Read the thread · 2026-10-01 · closed · 1 comment

bug(iana_search_registries): main registries missed or ranked past the first page

Server version

0.1.1

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

OS

macOS 27.0

Description

iana_search_registries matches every query word as a whole token, with no singular/plural folding, and orders results as exact-id hits then index order. Common queries miss the main registry or bury it, and four registry/sub-registry pairs come back twice. The example in the tool description and the…

Read the thread · 2026-10-01 · closed · 1 comment

bug(iana_get_rfc_status): series membership never returned; BCP/STD/FYI ids dead-end

Server version

0.1.1

mcp-ts-core version

0.13.10

Runtime

Node.js

Runtime version

Node 26.5.0

Transport

HTTP (Streamable HTTP)

OS

macOS 27.0

Description

rfc.see_also is described as "Related documents, e.g. its BCP or STD", but it relays the RFC Editor JSON see_also, which is always empty: [] on all 27 RFCs sampled (19 BCP, STD, or FYI members, 8 non-members), and no see-also on any of the 9,843 entries in the RFC Editor's rfc-index.xml…

Read the thread · 2026-10-01 · closed · 1 comment

The remaining reports are on the project's issue tracker.