Two MCP tools blew the per-response token cap when run against a real
medium-sized cluster (Bingham Memorial, ~1500 patterns in Internal-PT,
20 route filters with hundreds of member rules each):
route_devices_using_css("Internal-CSS") -> 103,590 chars
route_filters() -> 304,639 chars
Both responses are now compact-by-default with opt-in detail:
route_filters(include_members=False, default):
- returns name, clause, dial_plan, and member_count per filter
- 304,639 -> 17,354 chars (94% reduction)
- member_count is the audit-relevant signal anyway: filters with
100+ rules are complex; the count tells you that without paying
for the full rule listing
- include_members=True scopes detail to a single named filter
(BLK-ALWAYS-RF with 432 rules: 40K chars; tractable per-filter)
route_devices_using_css(max_per_category=50, default):
- each category returns at most max_per_category rows
- truncated: bool flag set when underlying count exceeds the cap
- 103,590 -> 13,855 chars (87% reduction)
- implementation uses SELECT FIRST max+1, so no extra COUNT query
per category — single round-trip with accurate truncation flag
- LLM can drill in via higher max_per_category or axl_sql when
truncated=true
Both changes are backward-compatible defaults; existing callers continue
to work and just get smaller, structured responses.
- route_plan.py: drop `NULL AS context` from voicemail_pilot_css query.
Informix rejected it as a syntax error; the column wasn't carrying any
signal anyway, so the simpler SELECT works and matches the other
reference-point queries.
- README.md: tool table now covers all 16 tools (route_device_pool_route_groups,
route_devices_using_css, route_filters were missing).
- .gitignore: explicitly ignore .env. Already covered by ~/.gitignore_global,
but worth being self-contained — anyone cloning without the global ignore
shouldn't be one stray `git add` away from leaking AXL credentials.
Read-only MCP server for Cisco Unified CM 15 AXL — built for LLM-driven
cluster auditing, with a particular focus on the Route Plan Report:
partitions, calling search spaces, route patterns, translation patterns,
called/calling party transformations, and digit-discard instructions.
Pairs intentionally with the sibling mcp-cisco-docs server (live
cluster state + vendor docs in one LLM context).
Architecture:
- zeep SOAP client to CUCM AXL
- WSDL bootstrap from Cisco's axlsqltoolkit.zip (auto-extract on
first launch; zip is gitignored, vendor-licensed)
- SQLite response cache at ~/.cache/mcp-cucm-axl/responses/
- Schema-grounded prompts that pull chunks from the sibling
cisco-docs index (docs_loader.py)
Read-only by structural guarantee — never registers AXL write methods
(no executeSQLUpdate, no add*/update*/remove*/apply*/reset*/restart*
tools). SQL queries also client-side validated (sql_validator.py) to
begin with SELECT or WITH.
Tools exposed:
Foundational: axl_version, axl_sql, axl_list_tables,
axl_describe_table, cache_stats, cache_clear
Route plan: route_partitions, route_calling_search_spaces,
route_patterns, route_inspect_pattern,
route_lists_and_groups, route_translation_chain,
route_digit_discard_instructions
Prompts (schema-grounded):
route_plan_overview, investigate_pattern, audit_routing,
cucm_sql_help
Tests cover cache, docs_loader, normalize, sql_validator, wildcard.
