Tools

Everything FastBill MCP by usefulapi exposes to your AI client: tools, resources and prompts.

26 capabilities26 tool

Automated heuristic

Tool docs quality: D — 26 tools graded

Average 42/100 for how clearly each description tells an AI client what the tool does, what it needs, and what it changes. It is not a security audit.

Grade A: 0
Grade B: 0
Grade C: 0
Grade D: 13
Grade F: 13

How grades work

fastbill_cancel_subscriptiontool
meta
Description quality grade F, 20/100 · 5 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: not passed0/15
  Open with an action verb, for example “Search issues…” or “Creates a label…”.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_complete_invoicetool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_create_articletool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_create_customertool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_create_estimatetool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_create_invoicetool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_create_projecttool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_create_time_entrytool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_get_customertool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_get_invoicetool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_articlestool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_contactstool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_customerstool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_estimatestool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_expensestool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_invoicestool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_projectstool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_recurring_invoicestool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_revenuestool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_templatestool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_list_time_entriestool
read
Description quality grade D, 50/100 · 3 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_request_featuretool
meta
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: not passed0/15
  Open with an action verb, for example “Search issues…” or “Creates a label…”.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_set_invoice_paidtool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_update_customertool
write
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: passed15/15
  Opens with an action verb.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: not passed0/15
  This looks like a write action. Say what changes, and whether it can be undone.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_upgradetool
meta
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: not passed0/15
  Open with an action verb, for example “Search issues…” or “Creates a label…”.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.
fastbill_usage_statustool
meta
Description quality grade F, 35/100 · 4 to fix
- Has a description: passed20/20
  The tool has a description an AI client can read.
- Sensible length: not passed0/20
  Only 1 word. Say what the tool needs and what it returns.
- Starts with what it does: not passed0/15
  Open with an action verb, for example “Search issues…” or “Creates a label…”.
- Mentions its inputs: not passed0/20
  Say what the tool needs, for example “by issue number” or “takes a file path”.
- Explains side effects: passed15/15
  Looks read-only, so no disclosure is required. Saying “read-only” still helps.
- Gives usage guidance: not passed0/10
  Add when to use it, what it requires, or what to use instead.