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Directory / eCFR

eCFR

Q: Is eCFR MCP server safe?

QAmcp's test on 28 Oct 2026: No hidden instructions were found in its tool descriptions. Its error messages showed no secrets or internal details. All 13 of its tools are labeled read-only. Overall it scored 73/100 on 28 Oct 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by 1102tools.com · https://ecfr.1102tools.com/mcp

Electronic Code of Federal Regulations including FAR, DFARS, and agency supplements. 13 tools.

13 tools✓ all read-only✓ no account neededPricing: not listed

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73 /100

FAIL

12 of 12 checks · 28 Oct 2026

Is eCFR MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 13 of its tools are labeled read-only.
Overall it scored 73/100 on 28 Oct 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

13 tools, in the server's own words.

get_latest_dateread-only

Get the most recent available date for a CFR title.

get_cfr_contentread-only

Get the full text of a CFR section, subpart, part, or appendix.

get_cfr_structureread-only

Get the hierarchical table of contents for a CFR title or subset.

get_version_historyread-only

Get the version history of a CFR section, subpart, or part.

get_ancestryread-only

Get the breadcrumb hierarchy path for a section, part, or appendix.

search_cfrread-only

Full-text search across the Code of Federal Regulations.

list_agenciesread-only

List all agencies with their CFR title and chapter references.

get_correctionsread-only

Get editorial corrections for a CFR title, newest first.

lookup_far_clauseread-only

Convenience tool: look up the current text of a FAR, DFARS or FAR supplement section or clause.

compare_versionsread-only

Compare the text of a CFR section at two different dates.

list_sections_in_partread-only

List all sections and appendices in a CFR part with their headings.

find_far_definitionread-only

Find a term's definition in FAR 2.101, the FAR's main definitions section.

find_recent_changesread-only

Find CFR sections changed since a given date, removals included.

Test results

Safe mode: only tools labeled read-only were run. How the test works

✕
Tools work with good inputs
5 failed, 1 warning
- !list_agencies: Answered with about 103 KB of text. Many AI apps cut off tool answers this big, so the AI may never see the end of it.
- ✕lookup_far_clause: Its reply breaks the MCP rules, so AI apps can't read it: its reply has the wrong shape
- ✕compare_versions: Its reply breaks the MCP rules, so AI apps can't read it: its reply has the wrong shape
- ✕list_sections_in_part: Its reply breaks the MCP rules, so AI apps can't read it: its reply has the wrong shape
- ✕find_far_definition: Its reply breaks the MCP rules, so AI apps can't read it: its reply has the wrong shape
- ✕find_recent_changes: Its reply breaks the MCP rules, so AI apps can't read it: its reply has the wrong shape
- and 7 more
fail
✕
Bad inputs give a clean error
10 failed
- ✕lookup_far_clause: Broke the MCP rules on missing required input "section_id": its reply has the wrong shape
- ✕lookup_far_clause: Broke the MCP rules on wrong type for "page": its reply has the wrong shape
- ✕compare_versions: Broke the MCP rules on missing required input "section_id": its reply has the wrong shape
- ✕compare_versions: Broke the MCP rules on wrong type for "date_before": its reply has the wrong shape
- ✕list_sections_in_part: Broke the MCP rules on missing required input "part_number": its reply has the wrong shape
- ✕list_sections_in_part: Broke the MCP rules on wrong type for "title_number": its reply has the wrong shape
- ✕find_far_definition: Broke the MCP rules on missing required input "term": its reply has the wrong shape
- ✕find_far_definition: Broke the MCP rules on wrong type for "term": its reply has the wrong shape
- and 11 more
fail
!
Every tool is described
13 warnings
- !get_latest_date: Inputs with no description: title_number
- !get_cfr_content: Inputs with no description: title_number, date, part, subpart, section, chapter, appendix, raw_xml, page
- !get_cfr_structure: Inputs with no description: title_number, date, chapter, subchapter, part, subpart, appendix, depth
- !get_version_history: Inputs with no description: title_number, part, section, subpart, since_date, until_date, per_page, page
- !get_ancestry: Inputs with no description: title_number, date, part, section, appendix, subpart
- !search_cfr: Inputs with no description: query, title, chapter, part, subpart, section, current_only, last_modified_after, last_modified_before, order, agency_slugs, per_page, page
- !list_agencies: Inputs with no description: summary_only
- !get_corrections: Inputs with no description: title_number, limit, since_year, section, part, chapter
- and 5 more
note
!
Fast enough
1 warning
- !search_cfr: Slowest tool: search_cfr (4.6 s): users will notice the wait
- and 3 more
note
✓
ConnectsConnected in 537 ms
pass
✓
Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
pass
✓
Lists its toolsFound 13 tools
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
No secrets leakedChecked 34 error messages: no secrets or internal details
pass
✓
Follows MCP best practices (not scored yet)Tool names, safety labels and tool list size follow the MCP guide
pass
✓
Resources and prompts work
All good ()
- –Could not list resources: the server limited our requests (HTTP 429)
- –Could not list prompts: the server limited our requests (HTTP 429)
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://ecfr.1102tools.com/mcp

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Score over time

28 Oct 202673

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use eCFR, signed in with GitHub, one per person. Reviews never change the score.

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