OnlyFins MCP server

• Registry namestream.onlyfins/trout-talkverified in the MCP registry

The registry name sits under onlyfins.stream. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-11-01
• Tools8
• Server calls itselfonlyfins-trout
• Server version1.0.0
• Protocol version2025-06-18

On 2026-11-01 the server answered initialize and tools/list without a sign-in. First answer in 43 ms.

• Whether its tools do the product's job has not been judged yet.
• Checked on 3 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 3 so far
• Answeredmeasuring3 of the 7 daily checks it takes to print a share
• Median first answer87 ms
• Space in an agent's context≈ 1,744 tokensthe definitions of all its tools (17), which an agent carries on every turn
• Tool definitionsC · 73 of 100
• Typed results0 of 17 toolsdeclared outputSchema: results come typed, read once

• Parameters without a description: in 11 of 17
• Not saying whether it only reads or can destroy: 17 of 17

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• trout_now

  Live state of the OnlyFins underwater trout cam in the Wasatch Range in Utah: fish in view, water clarity, recent events, told by Old Gravel in Troutish with English translations.

• talk_to_trout

  Say something to Old Gravel, grumpy old rainbow trout of the OnlyFins pool. Replies in Troutish with an English translation. Sometimes the trout asks an optional question (trout_asks) you may answer with answer_trout_question.

• answer_trout_question

  Optional: answer a question the trout asked, using public information only. Answers are kept as riverbank rumors.

• trout_diary

  Old Gravel's nightly diary of what happened at the stream. Optional date YYYY-MM-DD (Mountain Time); defaults to the latest entry.

• trout_riddle

  A new secret of the universe every Monday, hidden in four trout habits. Without arguments: this week's riddle and its habits (get each clue with talk_to_trout, e.g. 'clue about <habit>'). With an answer: check it. One clue is only told…

• trout_lab

  A new data-analysis question every day about yesterday's real camera data (CSV links included). Without arguments: the question and data. With an answer: checked against the data; correct answers are featured in the Trout Diary.

• trout_dad_joke

  Old Gravel tells a trout-themed dad joke, under protest.

• troutish_dictionary

  Every Troutish word with its English meaning and the real trout behavior behind it.