The phrase "agent needed" is correct and usable in written English.
It can be used in contexts where you are indicating that a representative or intermediary is required for a task or situation.
Example: "For this project to move forward, we have determined that an agent needed to facilitate communication between the two parties."
Alternatives: "representative required" or "intermediary sought".
The correct amount of the anhydride curing agent needed to achieve stoichiometry was experimentally examined by dynamic mechanical analysis (DMA).
The department's air-freight agent needed special permission from the UK Civil Aviation Authority to allow Aerocom's old Moldova-registered Ilyushin 67 transport plane to land in Britain.
Ultrasound visualization with e-stim−guided neurolysis can potentially allow adjustments in injection protocols that will reduce the volume of neurolytic agent needed to achieve clinical improvement.
One group, made up of five divisional GMs, latched onto the goal of greater cross-selling and had a near-immediate success story: As a small, narrowly focused team, they were able to recognize that a plentiful stabilization agent used in ice cream could be repurposed to replace a scarce agent needed by other customers, including makers of hairstyling products and fracking fluids.
In clinical practice it is difficult to estimate rapidly two important values: (i) the total age-corrected MAC multiple from measured end-expired concentrations of volatile agent and nitrous oxide; (ii) the end-expired concentration of volatile agent needed to obtain a given total MAC multiple.
Cochrane, now Dettori's racing agent, needed to pull his friend from the burning wreckage.
Your agent needs to do that for you.
When it comes to summer vacation planning, only your travel agent needs to know for sure.
Because of the presence of asymmetric information, each agent needs to form beliefs about other agents’ private information.
Such an agent needs meta-cognition in terms of both self-awareness and control.
One is that the imitating agent needs repeated trials, thus stepping away from the one-shot learning by demonstration paradigm.
