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FactLot

io.github.9mp96ygnbk-alt/factlot9mp96ygnbk-altstreamable-httpv0.1.1Scanned

Cited CRE facts and deterministic calculators for agents: rent, CAM, debt sizing, IRR, parcel IDs.

24 tools: 16 change things and 8 only read.

Tools: 0 delete, 0 irreversible, 16 write, 8 read.
  • Reads private data · 2
  • Reads text others write · 0
  • Can send data out · 0
  • 1 finding

Anlyon alternative

16 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

24 tools

Changes things 16Claude Code: ask
  • calc_cam_reconciliationReconcile a tenant's annual CAM charge: exclusions, occupancy gross-up of variable expenses, pro rata share, controllable-expense caps (compounding_from_base, simple_from_base, yea…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Reconcile a tenant's annual CAM charge: exclusions, occupancy gross-up of variable expenses, pro rata share, controllable-expense caps (compounding_from_base, simple_from_base, year_over_year), base year or expense stop, and estimates paid. Returns balance due and a full trace. Deterministic: use this instead of doing the math yourself; cite formula calc.cam_reconciliation@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: CAM / operating expense reconciliation
  • calc_debt_sizingSize the maximum loan under any combination of max LTV, min DSCR, and min debt yield for a given NOI, rate, and amortization.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Size the maximum loan under any combination of max LTV, min DSCR, and min debt yield for a given NOI, rate, and amortization. Reports the binding constraint, debt service, and resulting metrics. Deterministic: use this instead of doing the math yourself; cite formula calc.debt_sizing@2 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Loan sizing (LTV / DSCR / debt yield)
  • calc_hotel_metricsOccupancy, ADR, RevPAR, TRevPAR, and a USALI-style profit ladder for a period: departmental profit, GOP and margin, GOPPAR, management fees, EBITDA, FF&E reserve, and NOI (EBITDA l…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Occupancy, ADR, RevPAR, TRevPAR, and a USALI-style profit ladder for a period: departmental profit, GOP and margin, GOPPAR, management fees, EBITDA, FF&E reserve, and NOI (EBITDA less replacement reserve). Deterministic: use this instead of doing the math yourself; cite formula calc.hotel_metrics@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Hotel operating metrics (USALI)
  • calc_irrPeriodic and annualized IRR of periodic cash flows, as decimals (0.085 = 8.5%), solved deterministically by scanning a 1-point grid of per-period rates and bisecting each sign chan…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Periodic and annualized IRR of periodic cash flows, as decimals (0.085 = 8.5%), solved deterministically by scanning a 1-point grid of per-period rates and bisecting each sign change; reports every root it finds when cash flows have multiple IRRs (two roots within one grid step can be missed). Errors when the flows do not change sign or no root lies between -99.99% and 1000% per period. Deterministic: use this instead of doing the math yourself; cite formula calc.irr@2 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Internal rate of return
  • calc_lease_remeasurement_asc842Remeasure a lessee's lease liability and right-of-use asset under ASC 842 after a modification, lease-term reassessment, contingency resolution, or residual value guarantee change:…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Remeasure a lessee's lease liability and right-of-use asset under ASC 842 after a modification, lease-term reassessment, contingency resolution, or residual value guarantee change: new liability (PV of remaining payments), liability and ROU adjustments with any gain (ASC 842-20-35-4), and the per-period amortization table (operating: straight-line single lease cost; finance: interest plus amortization). Warns where judgment is needed. Deterministic: use this instead of doing the math yourself; cite formula calc.lease_remeasurement_asc842@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Lease remeasurement (ASC 842, lessee)
  • calc_net_effective_rentCompute effective rent, straight-line net effective rent, and discounted net effective rent ($/SF/yr) after free rent, TI allowance, leasing commissions, and other landlord concess…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Compute effective rent, straight-line net effective rent, and discounted net effective rent ($/SF/yr) after free rent, TI allowance, leasing commissions, and other landlord concessions. Deterministic: use this instead of doing the math yourself; cite formula calc.net_effective_rent@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Net effective rent (NER)
  • calc_npvNPV of periodic cash flows (t = 0, 1, 2, ...; the t = 0 flow is not discounted) at a per-period discount rate given as a decimal.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    NPV of periodic cash flows (t = 0, 1, 2, ...; the t = 0 flow is not discounted) at a per-period discount rate given as a decimal. Deterministic: use this instead of doing the math yourself; cite formula calc.npv@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Net present value
  • calc_percentage_rentPercentage (overage) rent for a lease year: net sales after exclusions over a natural or fixed breakpoint, prorated for partial years, less amounts already paid.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Percentage (overage) rent for a lease year: net sales after exclusions over a natural or fixed breakpoint, prorated for partial years, less amounts already paid. Deterministic: use this instead of doing the math yourself; cite formula calc.percentage_rent@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Retail percentage rent
  • calc_prepayment_and_defeasancePrepayment premium, total payoff, and cost as a share of balance for a fixed-rate amortizing or interest-only loan under yield maintenance (PV of remaining payments or rate differe…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Prepayment premium, total payoff, and cost as a share of balance for a fixed-rate amortizing or interest-only loan under yield maintenance (PV of remaining payments or rate differential, with a minimum and an explicit discounting convention), a step-down schedule, a flat percentage, or defeasance (cost of the securities portfolio that funds the remaining payments plus stated costs). Deterministic: use this instead of doing the math yourself; cite formula calc.prepayment_and_defeasance@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Loan prepayment premium and defeasance
  • calc_rent_scheduleBuild a base-rent schedule from commencement date, term, area, starting $/SF/yr, escalations (percent or fixed $/SF), and abated months.1 finding

    Why it is in this group

    • The name "calc_rent_schedule" says "schedule": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "calc_rent_schedule" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "calc_rent_schedule" says "schedule": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Build a base-rent schedule from commencement date, term, area, starting $/SF/yr, escalations (percent or fixed $/SF), and abated months. Returns rent steps, totals, expiration date, and a calculation trace. Deterministic: use this instead of doing the math yourself; cite formula calc.rent_schedule@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Lease rent schedule
  • calc_waltWeighted average remaining lease term in years, weighted by area or annual rent, as of a date.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Weighted average remaining lease term in years, weighted by area or annual rent, as of a date. Deterministic: use this instead of doing the math yourself; cite formula calc.walt@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Weighted average lease term (WALT)
  • id_documentContent-addressed FactLot ID (SHA-256) for a document such as a lease, amendment, or estoppel.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Content-addressed FactLot ID (SHA-256) for a document such as a lease, amendment, or estoppel.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: FactLot document ID
  • id_entityDeterministic FactLot ID for a legal entity (LLC, LP, corporation, trust) from its registry jurisdiction and file number, or from its LEI.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Deterministic FactLot ID for a legal entity (LLC, LP, corporation, trust) from its registry jurisdiction and file number, or from its LEI.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: FactLot legal-entity ID
  • id_parcelDeterministic FactLot ID for a parcel from state FIPS, county FIPS, and the assessor's parcel number (APN).No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Deterministic FactLot ID for a parcel from state FIPS, county FIPS, and the assessor's parcel number (APN). The same parcel always yields the same ID, offline. Use it as the join key across systems.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: FactLot parcel ID
  • id_spaceFactLot ID for a suite or unit within a building, given the building's FactLot URN.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    FactLot ID for a suite or unit within a building, given the building's FactLot URN. Suite designators are normalized.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: FactLot space (suite) ID
  • rules_tx_property_tax_protest_deadlineDeadline to file a Texas property tax protest with the appraisal review board: the later of May 15 or 30 days after the notice of appraised value was delivered, rolled past weekend…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Deadline to file a Texas property tax protest with the appraisal review board: the later of May 15 or 30 days after the notice of appraised value was delivered, rolled past weekends and Texas legal holidays, plus a conservative file-by date. Returns the statute citations and the rule's verification status. Verification status: verified. Cite rule rules.tx.property_tax_protest_deadline@1 and its statutes.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Texas property tax protest deadline
Only reads 8Show 8 read-only tools
  • calc_compare_proposalsRank 2–20 lease proposals with different terms, sizes, free rent, TI, concessions, and expense structures on one discounted $/SF/yr basis: effective occupancy cost (tenant perspect…No findings

    Why it is in this group

    • The name "calc_compare_proposals" says "compare": a word for reading.
    Description, as the server wrote it
    Rank 2–20 lease proposals with different terms, sizes, free rent, TI, concessions, and expense structures on one discounted $/SF/yr basis: effective occupancy cost (tenant perspective) or discounted net effective rent (landlord perspective). Deterministic: use this instead of doing the math yourself; cite formula calc.compare_proposals@1 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Compare lease proposals
  • calc_lease_vs_ownCompare leasing with buying over a fixed horizon: NPV of each case's annual cash costs (rent, free rent, tenant expenses, and move-in costs versus equity, debt service, owner expen…Reads private dataNo findings

    Why it is in this group

    • The description's first verb is "compare": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "compare" and "table": it reads databases.
    Description, as the server wrote it
    Compare leasing with buying over a fixed horizon: NPV of each case's annual cash costs (rent, free rent, tenant expenses, and move-in costs versus equity, debt service, owner expenses, reserves, and a sale at the horizon by stated value or exit cap rate), optionally after tax, with the year-by-year tables and the break-even residual value at which owning equals leasing. Deterministic: use this instead of doing the math yourself; cite formula calc.lease_vs_own@2 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Lease vs. own
  • calc_renew_vs_relocateCompare renewing in place with moving over one horizon: NPV and discounted effective rent of each case (rent schedule with free rent, TI net of allowance, fees, moving, downtime, d…No findings

    Why it is in this group

    • The description's first verb is "compare": a word for reading.
    Description, as the server wrote it
    Compare renewing in place with moving over one horizon: NPV and discounted effective rent of each case (rent schedule with free rent, TI net of allowance, fees, moving, downtime, double rent, termination, and disruption costs), the starting rent at which they break even, and year-by-year cash flows. Deterministic: use this instead of doing the math yourself; cite formula calc.renew_vs_relocate@2 and the returned steps, and surface any warnings.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Renew vs. relocate
  • fact_validateCheck that a fact conforms to the FactLot model (subject ID, dotted predicate, as_of date, provenance with citations, optional AI-use rights).No findings

    Why it is in this group

    • The name "fact_validate" says "validate": a word for reading.
    Description, as the server wrote it
    Check that a fact conforms to the FactLot model (subject ID, dotted predicate, as_of date, provenance with citations, optional AI-use rights). Returns { valid, issues }. Call before storing or sharing extracted facts.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Validate a FactLot fact
  • fetchFetch the full text of a FactLot knowledge document by the id returned from search.Reads private dataNo findings

    Why it is in this group

    • The name "fetch" says "fetch": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "fetch" and "document": it reads documents.
    Description, as the server wrote it
    Fetch the full text of a FactLot knowledge document by the id returned from search.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Fetch a FactLot knowledge document
  • id_parseValidate a FactLot URN and return its kind, components, and short ID.No findings

    Why it is in this group

    • The description's first verb is "validate": a word for reading.
    Description, as the server wrote it
    Validate a FactLot URN and return its kind, components, and short ID.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: Parse a FactLot ID
  • schema_getReturn the FactLot data model (Fact, Provenance, SourceRef, Rights, Relationship) as JSON Schema.No findings

    Why it is in this group

    • The name "schema_get" says "get": a word for reading.
    Description, as the server wrote it
    Return the FactLot data model (Fact, Provenance, SourceRef, Rights, Relationship) as JSON Schema.

    Annotations the server declares

    • readOnlyHint: true
    • idempotentHint: true
    • openWorldHint: false
    • destructiveHint: false
    • title: FactLot JSON Schemas

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged untrusted-input or outbound.

Reads private data2
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warncalc_rent_schedule

    The server marks "calc_rent_schedule" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "calc_rent_schedule" says "schedule": a word for a change.

    What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 0.1.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http factlot https://api.factlot.com/mcp
claude mcp add --transport http factlot https://api.factlot.com/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__factlot__calc_compare_proposals",
      "mcp__factlot__calc_lease_vs_own",
      "mcp__factlot__calc_renew_vs_relocate",
      "mcp__factlot__id_parse",
      "mcp__factlot__fact_validate",
      "mcp__factlot__search",
      "mcp__factlot__fetch",
      "mcp__factlot__schema_get"
    ],
    "ask": [
      "mcp__factlot__calc_rent_schedule",
      "mcp__factlot__calc_net_effective_rent",
      "mcp__factlot__calc_percentage_rent",
      "mcp__factlot__calc_cam_reconciliation",
      "mcp__factlot__calc_debt_sizing",
      "mcp__factlot__calc_lease_remeasurement_asc842",
      "mcp__factlot__calc_prepayment_and_defeasance",
      "mcp__factlot__calc_walt",
      "mcp__factlot__calc_npv",
      "mcp__factlot__calc_irr",
      "mcp__factlot__calc_hotel_metrics",
      "mcp__factlot__rules_tx_property_tax_protest_deadline",
      "mcp__factlot__id_parcel",
      "mcp__factlot__id_entity",
      "mcp__factlot__id_space",
      "mcp__factlot__id_document"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as factlot. Review it before you use it.

Capability tags behind 2 rules
  • mcp__factlot__calc_lease_vs_own private-data
  • mcp__factlot__fetch private-data

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/io.github.9mp96ygnbk-alt/factlot/verify?hash=0ad0856d2dfbe6707ffe8cc389e8932ecf52f3ec941c071e8bcce8a72ec18b05" | jq -e '.changed == false'

Pinned hash 0ad0856d2dfb, from Nov 3, 2026, 18:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.9mp96ygnbk-alt/factlot/changes.xml

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Badge

anlyon.dev badge for io.github.9mp96ygnbk-alt/factlot
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Source: MCP Registry · repository. Synced Nov 3, 2026, 18:17 UTC.