Stackcut

Find alternatives for a subscription

find_alternatives

Read-onlyIdempotent

Use when the user names one product they pay for and asks for something cheaper, whether it's worth it, or what to switch to: 'cheaper than Typeform?', 'is Semrush worth $139 a month for us?', 'we pay $90 for SendGrid'. Pass what they pay (monthly_spend_usd), seats, the features they use and their usage (usage, or evidence such as '40,000 emails/mo') so each plan's caps can be checked. Returns ranked paths re-costed at their price, including a cheaper plan of the same vendor (right_size). A path with fit 'fits' passed every check; a 'check' path is a candidate with open checks, so ask its questions before recommending it. status, why and questions say what is still missing. Savings are modeled from public list prices. Stackcut stores the arguments of tool calls to improve its recommendations (vendor names, prices, seats, features, usage numbers, billing amounts and project descriptions; account keys only as a one-way hash, billing and validation sources not at all; never IP addresses). Tool results are summarized; exit tools log only result counts, qualification flags and public evidence statuses, not answer contents. Don't send personal data or secrets.

Input Schema

Name	Required	Description
`plan`	No	Their plan, e.g. 'Essential' (else read from the vendor name)
`limit`	No
`seats`	No	Paid seats; per-seat prices on both sides scale with it
`usage`	No	Their usage, checked against each plan's caps (priced with published overage and add-ons). Units: seats, members, mau, emails_per_month, emails_per_day, contacts, domains, events_per_month, identified_events_per_month, pageviews_per_month, errors_per_month, requests_per_month, requests_per_day, searches_per_month, cpu_ms_per_request, db_gb, storage_gb, bandwidth_gb, projects, sites, videos, video_minutes, responses_per_month, tasks_per_month, keywords_tracked, credits_per_month, history_days, apps, files, boards, event_types, monitors, tokens_per_month, images_per_month, audio_minutes_per_month, characters_per_month, transactions_per_month, sandbox_hours_per_month, concurrent_sessions, session_minutes, call_participants, meeting_minutes, records, inboxes, tokens_in_per_month, tokens_out_per_month, cached_tokens_per_month, video_minutes_stored, video_minutes_delivered_per_month, gmv_usd_per_month, payouts_per_month, active_accounts, verifications_per_month, browser_hours_per_month, proxy_gb_per_month, job_executions_per_month, sso_connections, sso_users, inbound_emails_per_month, stream_hours_per_month, vcpu_hours_per_month, credits_usd_per_month, disputes_per_month, payout_volume_usd_per_month, object_writes_per_month, object_reads_per_month, job_executions_per_day, scim_connections, searches_per_hour, sms_per_month, vectors_stored, vector_queries_per_month, cache_commands_per_month, mtu, gpu_seconds_per_month, revenue_usd_per_month, phone_minutes_per_month, vector_read_units_per_month, vector_write_units_per_month, hosts, tickets_per_month (MAU is accepted for mau). Example: {"emails_per_month": 40000, "domains": 4, "db_gb": 3}. get_usage_questions says which units matter for a vendor and where the user finds each number.
`vendor`	Yes	Product name as on the invoice, e.g. 'Typeform', 'Slack Pro', 'HubSpot Sales Hub Starter'
`billing`	No	Billing evidence: scope (dedicated, shared or unknown), account_id (a non-secret alias; the account key), allocated_monthly_usd (attribution only, never a saving), avoidable_monthly_usd with avoidability_confirmed (what leaving actually removes from the bill; 0 is valid), commitment_months_remaining (non-refundable months left; 0 only when cancellable now) and source (a reference, no private contents). With billing, a path is eligible only once the avoidable amount, scope, commitment and source are all given
`evidence`	No	Usage facts in words, read best effort: 'db 1.5 GB', '40,000 emails/mo', '37 domains', '3,000 MAU', 'shared by 40 projects'
`confirmed`	No	true when the user confirmed they pay for this (with plan: its list price counts as confirmed spend). Scanner-only lines are unconfirmed
`last_active`	No	When this resource (project, app, account) was last used: an ISO date ('2026-03-10'), 'never', or '5 months ago'. 90+ days idle or never used gets a cleanup lever
`shared_with`	No	How many products share this bill (one account, org or team), when only this product is audited: moving one product off it saves only what it adds to the bill, never the whole bill. monthly_spend_usd is then the whole account's bill
`active_users`	No	People or accounts active in the last 30 days (0 = unused: cleanup levers and sanity checks)
`features_used`	No	Features they actually use; sizes and counts ('4,000 contacts', 'videos over 5 minutes') are read as usage
`monthly_spend_usd`	No	What they pay per month today, all seats (replaces the modeled baseline)
`revenue_usd_per_month`	No	The product's revenue per month (context for sanity checks: no revenue, cost per user, fees vs revenue; never a cap)
`replacement_validation`	No	A replacement path the user checked themselves: its current price, capacity, burst limits and paid add-ons against their usage. It answers that path's capacity checks (never its must-haves) and ranks it first

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 8, 2026

changedInput schema / properties / usage / description

Previous value: -"Their usage, checked against each plan's caps (priced with published overage and add-ons). Units: seats, members, mau, emails_per_month, emails_per_day, contacts, domains, events_per_month, identified_events_per_month, pageviews_per_month, errors_per_month, requests_per_month, requests_per_day, searches_per_month, cpu_ms_per_request, db_gb, storage_gb, bandwidth_gb, projects, sites, videos, video_minutes, responses_per_month, tasks_per_month, keywords_tracked, credits_per_month, history_days, apps, files, boards, event_types, monitors, tokens_per_month, images_per_month, audio_minutes_per_month, characters_per_month, transactions_per_month, sandbox_hours_per_month, concurrent_sessions, session_minutes, call_participants, meeting_minutes, records, inboxes, tokens_in_per_month, tokens_out_per_month, cached_tokens_per_month, video_minutes_stored, video_minutes_delivered_per_month, gmv_usd_per_month, payouts_per_month, active_accounts, verifications_per_month, browser_hours_per_month, proxy_gb_per_month, job_executions_per_month, sso_connections, sso_users, inbound_emails_per_month, stream_hours_per_month, vcpu_hours_per_month, credits_usd_per_month, disputes_per_month, payout_volume_usd_per_month, object_writes_per_month, object_reads_per_month, job_executions_per_day, scim_connections, searches_per_hour, sms_per_month, vectors_stored, vector_queries_per_month, cache_commands_per_month, mtu, gpu_seconds_per_month, revenue_usd_per_month, phone_minutes_per_month, vector_read_units_per_month, vector_write_units_per_month (MAU is accepted for mau). Example: {\"emails_per_month\": 40000, \"domains\": 4, \"db_gb\": 3}. get_usage_questions says which units matter for a vendor and where the user finds each number."New value: +"Their usage, checked against each plan's caps (priced with published overage and add-ons). Units: seats, members, mau, emails_per_month, emails_per_day, contacts, domains, events_per_month, identified_events_per_month, pageviews_per_month, errors_per_month, requests_per_month, requests_per_day, searches_per_month, cpu_ms_per_request, db_gb, storage_gb, bandwidth_gb, projects, sites, videos, video_minutes, responses_per_month, tasks_per_month, keywords_tracked, credits_per_month, history_days, apps, files, boards, event_types, monitors, tokens_per_month, images_per_month, audio_minutes_per_month, characters_per_month, transactions_per_month, sandbox_hours_per_month, concurrent_sessions, session_minutes, call_participants, meeting_minutes, records, inboxes, tokens_in_per_month, tokens_out_per_month, cached_tokens_per_month, video_minutes_stored, video_minutes_delivered_per_month, gmv_usd_per_month, payouts_per_month, active_accounts, verifications_per_month, browser_hours_per_month, proxy_gb_per_month, job_executions_per_month, sso_connections, sso_users, inbound_emails_per_month, stream_hours_per_month, vcpu_hours_per_month, credits_usd_per_month, disputes_per_month, payout_volume_usd_per_month, object_writes_per_month, object_reads_per_month, job_executions_per_day, scim_connections, searches_per_hour, sms_per_month, vectors_stored, vector_queries_per_month, cache_commands_per_month, mtu, gpu_seconds_per_month, revenue_usd_per_month, phone_minutes_per_month, vector_read_units_per_month, vector_write_units_per_month, hosts, tickets_per_month (MAU is accepted for mau). Example: {\"emails_per_month\": 40000, \"domains\": 4, \"db_gb\": 3}. get_usage_questions says which units matter for a vendor and where the user finds each number."

addedInput schema / properties / usage / properties / hosts

Added value: +{
+  "maximum": 1000000000000,
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / usage / properties / tickets_per_month

Added value: +{
+  "maximum": 1000000000000,
+  "minimum": 0,
+  "type": "number"
+}

Changed3 schema fields changedOct 5, 2026

changedInput schema / properties / usage / description

Previous value: -"Their usage, checked against each plan's caps (priced with published overage and add-ons). Units: seats, members, mau, emails_per_month, emails_per_day, contacts, domains, events_per_month, pageviews_per_month, errors_per_month, requests_per_month, requests_per_day, searches_per_month, cpu_ms_per_request, db_gb, storage_gb, bandwidth_gb, projects, sites, videos, video_minutes, responses_per_month, tasks_per_month, keywords_tracked, credits_per_month, history_days, apps, files, event_types, monitors, tokens_per_month, images_per_month, audio_minutes_per_month, characters_per_month, transactions_per_month, sandbox_hours_per_month, concurrent_sessions, session_minutes, call_participants, meeting_minutes, records, inboxes, tokens_in_per_month, tokens_out_per_month, cached_tokens_per_month, video_minutes_stored, video_minutes_delivered_per_month, gmv_usd_per_month, payouts_per_month, active_accounts, verifications_per_month, browser_hours_per_month, proxy_gb_per_month, job_executions_per_month, sso_connections, sso_users, inbound_emails_per_month, stream_hours_per_month, vcpu_hours_per_month, credits_usd_per_month, disputes_per_month, payout_volume_usd_per_month, object_writes_per_month, object_reads_per_month, job_executions_per_day, scim_connections, searches_per_hour, sms_per_month, vectors_stored, vector_queries_per_month, cache_commands_per_month, mtu, gpu_seconds_per_month, revenue_usd_per_month, phone_minutes_per_month, vector_read_units_per_month, vector_write_units_per_month (MAU is accepted for mau). Example: {\"emails_per_month\": 40000, \"domains\": 4, \"db_gb\": 3}. get_usage_questions says which units matter for a vendor and where the user finds each number."New value: +"Their usage, checked against each plan's caps (priced with published overage and add-ons). Units: seats, members, mau, emails_per_month, emails_per_day, contacts, domains, events_per_month, identified_events_per_month, pageviews_per_month, errors_per_month, requests_per_month, requests_per_day, searches_per_month, cpu_ms_per_request, db_gb, storage_gb, bandwidth_gb, projects, sites, videos, video_minutes, responses_per_month, tasks_per_month, keywords_tracked, credits_per_month, history_days, apps, files, boards, event_types, monitors, tokens_per_month, images_per_month, audio_minutes_per_month, characters_per_month, transactions_per_month, sandbox_hours_per_month, concurrent_sessions, session_minutes, call_participants, meeting_minutes, records, inboxes, tokens_in_per_month, tokens_out_per_month, cached_tokens_per_month, video_minutes_stored, video_minutes_delivered_per_month, gmv_usd_per_month, payouts_per_month, active_accounts, verifications_per_month, browser_hours_per_month, proxy_gb_per_month, job_executions_per_month, sso_connections, sso_users, inbound_emails_per_month, stream_hours_per_month, vcpu_hours_per_month, credits_usd_per_month, disputes_per_month, payout_volume_usd_per_month, object_writes_per_month, object_reads_per_month, job_executions_per_day, scim_connections, searches_per_hour, sms_per_month, vectors_stored, vector_queries_per_month, cache_commands_per_month, mtu, gpu_seconds_per_month, revenue_usd_per_month, phone_minutes_per_month, vector_read_units_per_month, vector_write_units_per_month (MAU is accepted for mau). Example: {\"emails_per_month\": 40000, \"domains\": 4, \"db_gb\": 3}. get_usage_questions says which units matter for a vendor and where the user finds each number."

addedInput schema / properties / usage / properties / boards

Added value: +{
+  "maximum": 1000000000000,
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / usage / properties / identified_events_per_month

Added value: +{
+  "maximum": 1000000000000,
+  "minimum": 0,
+  "type": "number"
+}

Changed80 schema fields changedSep 26, 2026
- addedInput schema / properties / billing
```
Added value: +{
+  "additionalProperties": false,
+  "description": "Billing evidence: scope (dedicated, shared or unknown), account_id (a non-secret alias; the account key), allocated_monthly_usd (attribution only, never a saving), avoidable_monthly_usd with avoidability_confirmed (what leaving actually removes from the bill; 0 is valid), commitment_months_remaining (non-refundable months left; 0 only when cancellable now) and source (a reference, no private contents). With billing, a path is eligible only once the avoidable amount, scope, commitment and source are all given",
+  "properties": {
+    "account_id": {
+      "maxLength": 200,
+      "minLength": 1,
+      "type": "string"
+    },
+    "allocated_monthly_usd": {
+      "maximum": 1000000000000,
+      "minimum": 0,
+      "type": "number"
+    },
+    "avoidability_confirmed": {
+      "type": "boolean"
+    },
+    "avoidable_monthly_usd": {
+      "maximum": 1000000000000,
+      "minimum": 0,
+      "type": "number"
+    },
+    "commitment_months_remaining": {
+      "maximum": 120,
+      "minimum": 0,
+      "type": "number"
+    },
+    "scope": {
+      "enum": [
+        "dedicated",
+        "shared",
+        "unknown"
+      ],
+      "maxLength": 2000,
+      "type": "string"
+    },
+    "source": {
+      "maxLength": 1000,
+      "minLength": 1,
+      "type": "string"
+    }
+  },
+  "type": "object"
+}
```
- addedInput schema / properties / replacement_validation
```
Added value: +{
+  "additionalProperties": false,
+  "description": "A replacement path the user checked themselves: its current price, capacity, burst limits and paid add-ons against their usage. It answers that path's capacity checks (never its must-haves) and ranks it first",
+  "properties": {
+    "capacity_and_price_confirmed": {
+      "description": "true only after checking the price, capacity, burst limits and required add-ons",
+      "type": "boolean"
+    },
+    "path_id": {
+      "description": "The path id (from find_alternatives or audit_stack)",
+      "maxLength": 200,
+      "minLength": 1,
+      "type": "string"
+    },
+    "source": {
+      "description": "Where the check comes from (usage report, pricing page, quote); no private contents",
+      "maxLength": 1000,
+      "minLength": 1,
+      "type": "string"
+    }
+  },
+  "required": [
+    "path_id",
+    "capacity_and_price_confirmed",
+    "source"
+  ],
+  "type": "object"
+}
```
- addedInput schema / properties / usage / properties / MAU / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / active_accounts / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / apps / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / audio_minutes_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / bandwidth_gb / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / browser_hours_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / cache_commands_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / cached_tokens_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / call_participants / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / characters_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / concurrent_sessions / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / contacts / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / cpu_ms_per_request / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / credits_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / credits_usd_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / db_gb / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / disputes_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / domains / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / emails_per_day / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / emails_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / errors_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / event_types / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / events_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / files / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / gmv_usd_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / gpu_seconds_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / history_days / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / images_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / inbound_emails_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / inboxes / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / job_executions_per_day / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / job_executions_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / keywords_tracked / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / mau / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / meeting_minutes / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / members / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / monitors / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / mtu / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / object_reads_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / object_writes_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / pageviews_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / payout_volume_usd_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / payouts_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / phone_minutes_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / projects / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / proxy_gb_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / records / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / requests_per_day / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / requests_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / responses_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / revenue_usd_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / sandbox_hours_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / scim_connections / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / searches_per_hour / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / searches_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / seats / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / session_minutes / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / sites / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / sms_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / sso_connections / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / sso_users / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / storage_gb / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / stream_hours_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / tasks_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / tokens_in_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / tokens_out_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / tokens_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / transactions_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / vcpu_hours_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / vector_queries_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / vector_read_units_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / vector_write_units_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / vectors_stored / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / verifications_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / video_minutes / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / video_minutes_delivered_per_month / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / video_minutes_stored / maximum
```
Added value: +1000000000000
```
- addedInput schema / properties / usage / properties / videos / maximum
```
Added value: +1000000000000
```

Changed18 schema fields changedSep 26, 2026

addedInput schema / properties / active_users

Added value: +{
+  "description": "People or accounts active in the last 30 days (0 = unused: cleanup levers and sanity checks)",
+  "maximum": 1000000000,
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / confirmed

Added value: +{
+  "description": "true when the user confirmed they pay for this (with plan: its list price counts as confirmed spend). Scanner-only lines are unconfirmed",
+  "type": "boolean"
+}

changedInput schema / properties / evidence / description

Previous value: -"Usage facts in words, read best effort: 'db 1.5 GB', '40,000 emails/mo', '37 domains', '3,000 MAU'"New value: +"Usage facts in words, read best effort: 'db 1.5 GB', '40,000 emails/mo', '37 domains', '3,000 MAU', 'shared by 40 projects'"

addedInput schema / properties / last_active

Added value: +{
+  "description": "When this resource (project, app, account) was last used: an ISO date ('2026-03-10'), 'never', or '5 months ago'. 90+ days idle or never used gets a cleanup lever",
+  "maxLength": 100,
+  "type": "string"
+}

addedInput schema / properties / revenue_usd_per_month

Added value: +{
+  "description": "The product's revenue per month (context for sanity checks: no revenue, cost per user, fees vs revenue; never a cap)",
+  "maximum": 1000000000,
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / shared_with

Added value: +{
+  "description": "How many products share this bill (one account, org or team), when only this product is audited: moving one product off it saves only what it adds to the bill, never the whole bill. monthly_spend_usd is then the whole account's bill",
+  "maximum": 100000,
+  "minimum": 1,
+  "type": "integer"
+}

changedInput schema / properties / usage / description

Previous value: -"Their usage, checked against each plan's caps (priced with published overage and add-ons). Units: seats, members, mau, emails_per_month, emails_per_day, contacts, domains, events_per_month, pageviews_per_month, errors_per_month, requests_per_month, requests_per_day, searches_per_month, cpu_ms_per_request, db_gb, storage_gb, bandwidth_gb, projects, sites, videos, video_minutes, responses_per_month, tasks_per_month, keywords_tracked, credits_per_month, history_days, apps, files, event_types, monitors, tokens_per_month, images_per_month, audio_minutes_per_month, characters_per_month, transactions_per_month, sandbox_hours_per_month, concurrent_sessions, session_minutes, call_participants, meeting_minutes, records, inboxes, tokens_in_per_month, tokens_out_per_month, cached_tokens_per_month, video_minutes_stored, video_minutes_delivered_per_month, gmv_usd_per_month, payouts_per_month, active_accounts, verifications_per_month, browser_hours_per_month, proxy_gb_per_month, job_executions_per_month, sso_connections, sso_users, inbound_emails_per_month, stream_hours_per_month, vcpu_hours_per_month, credits_usd_per_month, disputes_per_month, payout_volume_usd_per_month, object_writes_per_month, object_reads_per_month, job_executions_per_day, scim_connections (MAU is accepted for mau). Example: {\"emails_per_month\": 40000, \"domains\": 4, \"db_gb\": 3}. get_usage_questions says which units matter for a vendor and where the user finds each number."New value: +"Their usage, checked against each plan's caps (priced with published overage and add-ons). Units: seats, members, mau, emails_per_month, emails_per_day, contacts, domains, events_per_month, pageviews_per_month, errors_per_month, requests_per_month, requests_per_day, searches_per_month, cpu_ms_per_request, db_gb, storage_gb, bandwidth_gb, projects, sites, videos, video_minutes, responses_per_month, tasks_per_month, keywords_tracked, credits_per_month, history_days, apps, files, event_types, monitors, tokens_per_month, images_per_month, audio_minutes_per_month, characters_per_month, transactions_per_month, sandbox_hours_per_month, concurrent_sessions, session_minutes, call_participants, meeting_minutes, records, inboxes, tokens_in_per_month, tokens_out_per_month, cached_tokens_per_month, video_minutes_stored, video_minutes_delivered_per_month, gmv_usd_per_month, payouts_per_month, active_accounts, verifications_per_month, browser_hours_per_month, proxy_gb_per_month, job_executions_per_month, sso_connections, sso_users, inbound_emails_per_month, stream_hours_per_month, vcpu_hours_per_month, credits_usd_per_month, disputes_per_month, payout_volume_usd_per_month, object_writes_per_month, object_reads_per_month, job_executions_per_day, scim_connections, searches_per_hour, sms_per_month, vectors_stored, vector_queries_per_month, cache_commands_per_month, mtu, gpu_seconds_per_month, revenue_usd_per_month, phone_minutes_per_month, vector_read_units_per_month, vector_write_units_per_month (MAU is accepted for mau). Example: {\"emails_per_month\": 40000, \"domains\": 4, \"db_gb\": 3}. get_usage_questions says which units matter for a vendor and where the user finds each number."

addedInput schema / properties / usage / properties / cache_commands_per_month
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```
addedInput schema / properties / usage / properties / gpu_seconds_per_month
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```

addedInput schema / properties / usage / properties / mtu

Added value: +{
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / usage / properties / phone_minutes_per_month
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```
addedInput schema / properties / usage / properties / revenue_usd_per_month
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```
addedInput schema / properties / usage / properties / searches_per_hour
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```
addedInput schema / properties / usage / properties / sms_per_month
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```
addedInput schema / properties / usage / properties / vector_queries_per_month
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```
addedInput schema / properties / usage / properties / vector_read_units_per_month
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```
addedInput schema / properties / usage / properties / vector_write_units_per_month
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```
addedInput schema / properties / usage / properties / vectors_stored
```
Added value: +{
+  "minimum": 0,
+  "type": "number"
+}
```

Changed12 schema fields changedSep 26, 2026

addedInput schema / properties / evidence

Added value: +{
+  "description": "Usage facts in words, read best effort: 'db 1.5 GB', '40,000 emails/mo', '37 domains', '3,000 MAU'",
+  "items": {
+    "maxLength": 500,
+    "type": "string"
+  },
+  "maxItems": 50,
+  "type": "array"
+}

changedInput schema / properties / features_used / description

Previous value: -"Features they actually use"New value: +"Features they actually use; sizes and counts ('4,000 contacts', 'videos over 5 minutes') are read as usage"

addedInput schema / properties / features_used / items / maxLength
```
Added value: +200
```
addedInput schema / properties / features_used / maxItems
```
Added value: +50
```

changedInput schema / properties / monthly_spend_usd / description

Previous value: -"What they pay per month today (replaces the modeled baseline)"New value: +"What they pay per month today, all seats (replaces the modeled baseline)"

addedInput schema / properties / monthly_spend_usd / maximum
```
Added value: +1000000
```

addedInput schema / properties / plan

Added value: +{
+  "description": "Their plan, e.g. 'Essential' (else read from the vendor name)",
+  "maxLength": 100,
+  "type": "string"
+}

addedInput schema / properties / seats

Added value: +{
+  "description": "Paid seats; per-seat prices on both sides scale with it",
+  "maximum": 100000,
+  "minimum": 1,
+  "type": "integer"
+}

addedInput schema / properties / usage

Added value: +{
+  "additionalProperties": false,
+  "description": "Their usage, checked against each plan's caps (priced with published overage and add-ons). Units: seats, members, mau, emails_per_month, emails_per_day, contacts, domains, events_per_month, pageviews_per_month, errors_per_month, requests_per_month, requests_per_day, searches_per_month, cpu_ms_per_request, db_gb, storage_gb, bandwidth_gb, projects, sites, videos, video_minutes, responses_per_month, tasks_per_month, keywords_tracked, credits_per_month, history_days, apps, files, event_types, monitors, tokens_per_month, images_per_month, audio_minutes_per_month, characters_per_month, transactions_per_month, sandbox_hours_per_month, concurrent_sessions, session_minutes, call_participants, meeting_minutes, records, inboxes, tokens_in_per_month, tokens_out_per_month, cached_tokens_per_month, video_minutes_stored, video_minutes_delivered_per_month, gmv_usd_per_month, payouts_per_month, active_accounts, verifications_per_month, browser_hours_per_month, proxy_gb_per_month, job_executions_per_month, sso_connections, sso_users, inbound_emails_per_month, stream_hours_per_month, vcpu_hours_per_month, credits_usd_per_month, disputes_per_month, payout_volume_usd_per_month, object_writes_per_month, object_reads_per_month, job_executions_per_day, scim_connections (MAU is accepted for mau). Example: {\"emails_per_month\": 40000, \"domains\": 4, \"db_gb\": 3}. get_usage_questions says which units matter for a vendor and where the user finds each number.",
+  "properties": {
+    "MAU": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "active_accounts": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "apps": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "audio_minutes_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "bandwidth_gb": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "browser_hours_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "cached_tokens_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "call_participants": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "characters_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "concurrent_sessions": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "contacts": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "cpu_ms_per_request": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "credits_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "credits_usd_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "db_gb": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "disputes_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "domains": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "emails_per_day": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "emails_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "errors_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "event_types": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "events_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "files": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "gmv_usd_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "history_days": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "images_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "inbound_emails_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "inboxes": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "job_executions_per_day": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "job_executions_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "keywords_tracked": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "mau": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "meeting_minutes": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "members": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "monitors": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "object_reads_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "object_writes_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "pageviews_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "payout_volume_usd_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "payouts_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "projects": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "proxy_gb_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "records": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "requests_per_day": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "requests_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "responses_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "sandbox_hours_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "scim_connections": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "searches_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "seats": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "session_minutes": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "sites": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "sso_connections": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "sso_users": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "storage_gb": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "stream_hours_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "tasks_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "tokens_in_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "tokens_out_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "tokens_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "transactions_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "vcpu_hours_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "verifications_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "video_minutes": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "video_minutes_delivered_per_month": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "video_minutes_stored": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "videos": {
+      "minimum": 0,
+      "type": "number"
+    }
+  },
+  "type": "object"
+}

changedInput schema / properties / vendor / description

Previous value: -"Product name, e.g. 'Typeform'"New value: +"Product name as on the invoice, e.g. 'Typeform', 'Slack Pro', 'HubSpot Sales Hub Starter'"

addedInput schema / properties / vendor / maxLength
```
Added value: +200
```
addedInput schema / properties / vendor / minLength
```
Added value: +1
```

First observedSep 25, 2026

TDQS

A4.6/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Adds substantial context beyond the annotations: savings are 'modeled from public list prices', results are summarized, and there is an explicit data-handling disclosure (what arguments are stored, that account keys are hashed, billing/validation sources are excluded, and no personal data should be sent). The 'fits' vs 'check' fit semantics and the instruction to ask a check path's questions before recommending it are exactly the behavioral detail annotations cannot carry.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the usage trigger and return semantics, and every sentence is doing work. The privacy paragraph is long, but for a tool that persists call arguments it earns its place; overall it is dense rather than padded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

There is no output schema, so the description must explain returns — and it does (ranked re-costed paths, right_size, fit values, status/why/questions). Combined with the pricing caveat, data policy, and parameter sourcing advice, it is complete for a 15-parameter, nested-object tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is already 93%, so the schema does most of the work. The description still adds targeted guidance — pass monthly_spend_usd, seats, features used, and usage/evidence 'so each plan's caps can be checked' — which explains why these inputs matter and how to source them (evidence strings, get_usage_questions).

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('find alternatives' for a subscription the user pays for) and pins the scope to a single named product rather than the whole stack, which implicitly separates it from audit_stack/choose_stack. The return shape ('ranked paths re-costed at their price, including a cheaper plan of the same vendor') makes the purpose unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Opens with an explicit when-to-use trigger ('the user names one product they pay for and asks for something cheaper, whether it's worth it, or what to switch to') reinforced by three realistic utterances. It stops short of naming sibling alternatives (audit_stack, choose_stack, prepare_negotiation) or stating when not to use this tool, so it is strong context without full routing.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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