Atlas entry
www.
13 capabilities over MCP. First atlas observation.
13 tools. 6 only read. 1 only computes. 1 changes records. 5 have no reading.◇
AI reading, beta. side-effects v1 on claude-haiku-5.5, calibrated on MCP (golden-3). Only readings above a measured precision count. Counts are tools, not calls: no tool was called.
AI readings summary · beta
The service lists 13 tools, and 8 have AI readings.
create_topup_link is read as creating records.
6 tools are read as read-only, including list_templates, list_handwriting_styles and list_orders.
Written by code from the AI readings on this page: it groups them and says nothing they do not.
What an agent can do here
AI readings, beta · Readings on 8 of 13 MCP tools.
Moves money
0
No tool read this way.
Deletes or cancels records
0
No tool read this way.
Sends messages to people
0
No tool read this way.
Changes permissions
0
No tool read this way.
Runs code
0
No tool read this way.
Should ask a person first
0
No tool read this way.
No counted reading 5 tools No reading was counted, so any effect above is possible for them: check_connection, connect_account, create_order, get_pricing, verify_address.
What changed
First atlas observation. Atlas history
Look first
AI reading, beta: AI adds items here; it never removes one.
No tool is read as one of the six effects. A zero is a count, not a clearance.
Surfaces
5 protocols checked
| ARD | Not found | No document retrieved |
|---|---|---|
| A2A | Not found | 0 skills |
| MCP | Valid | 2025-06-18 · 13 tools · resources not advertised · prompts not advertised |
| OpenAPI | Not detected | 0 operations |
| WebMCP | Not detected | 0 declarative form tools · experimental |
Exact states and meaning
- ARDabsent
Exact state: not found · No document retrieved
The supported discovery location returned no matching document.
Not found does not prove the service exposes no such interface elsewhere.
Not observed / not fetched
- A2Aabsent
Exact state: not found · 0 skills
The supported discovery location returned no matching document.
Not found does not prove the service exposes no such interface elsewhere.
Not observed / not fetched
- MCPobserved
Exact state: valid · Revision 2025-06-18 · 13 tools · resources not advertised · prompts not advertised
A usable protocol document was retrieved and validated.
Directly observed
- OpenAPIabsent
Exact state: not detected · 0 operations
No endpoint was established from the evidence and scope that InterfaceDelta inspected.
Not detected does not prove that no endpoint exists.
Not observed / not fetched
- WebMCPabsent
Exact state: not detected · 0 declarative form tools · experimental
No named declarative WebMCP form tools were observed in the origin root HTML.
Script-registered tools and other pages are not observed, so this does not mean the site has no WebMCP tools.
Not observed / not fetched
Capabilities
Showing 13 of 13.
| Tool and inputs | ◇ AI reading, beta · confidence | ||||||
|---|---|---|---|---|---|---|---|
| Read as none of the six 8 Not a clearance. | |||||||
| amount_cents* | Creates records0.85 | ||||||
| |||||||
| no inputs | Reads only0.88 | ||||||
| |||||||
| order_id* | Reads only0.90 | ||||||
| |||||||
| no inputs | Reads only0.85 | ||||||
| |||||||
| no inputs | Reads only0.88 | ||||||
| |||||||
| limit, status | Reads only0.91 | ||||||
| |||||||
| favorites_only, search, sort | Reads only0.90 | ||||||
| |||||||
| handwriting_style, message*, product_type, recipient | Computes only, changes nothing0.87 | ||||||
| |||||||
| No counted reading 5 No reading was counted, so any effect is possible. | |||||||
| poll_secret*, request_id* | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| agent_name*, email*, mode | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| extras, idempotency_key, mailing, message* and 7 more | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| char_count, envelope_output_mode, envelope_stock, letter_count and 7 more | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| address_line1*, address_line2, city*, state* and 1 more | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
Read as this effect No reading: unknown Not read as this effect◇ AI readings, beta. A zero is a count, not a clearance.
Not observed in this Passport: A2A skills, MCP resources, MCP prompts, OpenAPI operations.
The atlas shows each capability by its plain identifier, inputs and declared sign-in. Publisher descriptions, paths, links and source evidence are not published here.
The comparison with the previous observation is shown only to the account that recorded it.
Atlas history
1 observation
- 13 capabilities · MCP 2025-06-18 · MCP endpoint validFirst observation
Fingerprint and versions
- Fingerprint
a78d2231d330866b12ad126485825244454a628f310b89b275ac2e02b9a6ca63- Passport schema
- 0.5.0, passport-semantic-v4
- Consistency
- MCP_PROMPTS_ADVERTISEMENT_LIST: not applicable · MCP_RESOURCES_ADVERTISEMENT_LIST: not applicable · MCP_TOOLS_ADVERTISEMENT_LIST: match · OPENAPI_MCP_EXPLICIT_MAPPING: not applicable
Each class compares an observation with the previous atlas observation. Runs of unchanged observations are grouped. Struck values are what the previous observation recorded; inserted values are what this one recorded.
Declared and observed
No tools declare hints.
A disagreement is not a finding about the service: either side can be wrong. How we compare declarations and readings.
About this entry
com.premierletters/mcpListedOfficial MCP Registry · first listed 23 Sep 2026 · last listed 3 Nov 2026
Passive observations of a public interface listed in the Official MCP Registry. An observation does not verify security, ownership or compliance, and InterfaceDelta assigns no scores or rankings. Methodology · Report an inaccuracy · Ask for removal
Identity and snapshot
- Target key
sha256:eda0e8d2a890c3a1119930675d34098c7c9ea7cbb97297717a470fe7ec779132- Locator SHA-256
ec02e8ac8ba28afe545f053c7943dab08aeab9855191aa09dd94de86b3b642df- Snapshot generated
- 14 Nov 2026, 08:50 UTC
The entry is one exact observed target, not a real-world service identity, and implies no ownership. Endpoint paths are not published; the locator hash lets an operator confirm their own URL.